TY - CONF AU - Stratakis, D. AU - Drendel, B.E. AU - Froemming, N.S. AU - Morgan, J.P. AU - Syphers, M.J. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - Commissioning and First Results of the Fermilab Muon Campus J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - In the following years, the Fermilab Muon Campus will deliver highly polarized muon beams to the Muon g-2 Experiment. The Muon Campus contains a target section wherein secondaries are produced, the delivery ring which separates the muons from the rest of the beam and a sequence of beamlines that transports them to the Muon g-2 storage ring. Here, we report the first results of beam measurements at the Muon Campus with emphasis on the key achievements that have contributed to the successful beam delivery to the Muon g-2 Experiment. These achievements include the production of an intense secondary beam from the target, it’s transport over 2 km, the successful monitoring of muons from the available diagnostics and the development of techniques for measuring the transverse optics. We also present detailed comparisons between experimental data and simulation and discuss the similarities and differences observed. PB - JACoW Publishing CP - Geneva, Switzerland SP - 41 EP - 44 KW - experiment KW - positron KW - target KW - proton KW - MMI DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-MOZZPLM3 UR - http://jacow.org/ipac2019/papers/mozzplm3.pdf ER - TY - CONF AU - Montag, C. AU - Bassi, G. AU - Beebe-Wang, J. AU - Berg, J.S. AU - Blaskiewicz, M. AU - Blednykh, A. AU - Brennan, J.M. AU - Brooks, S.J. AU - Brown, K.A. AU - Drees, K.A. AU - Fedotov, A.V. AU - Fischer, W. AU - Gassner, D.M. AU - Gianfelice-Wendt, E. AU - Guo, W. AU - Hao, Y. AU - Hershcovitch, A. AU - Hetzel, C. AU - Holmes, D. AU - Huang, H. AU - Jackson, W.A. AU - Kewisch, J. AU - Li, Y. AU - Liu, C. AU - Lovelace III, H. AU - Luo, Y. AU - Minty, M.G. AU - Méot, F. AU - Palmer, R.B. AU - Parker, B. AU - Peggs, S. AU - Ptitsyn, V. AU - Ranjbar, V.H. AU - Robert-Demolaize, G. AU - Seletskiy, S. AU - Smaluk, V.V. AU - Smith, K.S. AU - Tepikian, S. AU - Thieberger, P. AU - Trbojevic, D. AU - Tsoupas, N. AU - Verdú-Andrés, S. AU - Weng, W.-T. AU - Willeke, F.J. AU - Witte, H. AU - Wu, Q. AU - Xu, W. AU - Zaltsman, A. AU - Zhang, W. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - eRHIC Design Overview J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - The Electron-Ion Collider (EIC) is being envisioned as the next facility to be constructed by the DOE Nuclear Physics program. Brookhaven National Laboratory is proposing eRHIC, a facility based on the existing RHIC complex as a cost effective realization of the EIC project with a peak luminosity of 10³⁴ cm⁻² sec⁻¹. An electron storage ring with an energy range from 5 to 18 GeV will be added in the existing RHIC tunnel. A spin-transparent rapid-cycling synchrotron (RCS) will serve as a full-energy polarized electron injector. Recent design improvements include reduction of the IR magnet strengths to avoid the necessity for Nb₃Sn magnets, and a novel hadron injection scheme to maximize the integrated luminosity. We will provide an overview of this proposed project and present the current design status. PB - JACoW Publishing CP - Geneva, Switzerland SP - 45 EP - 48 KW - electron KW - hadron KW - proton KW - storage-ring KW - luminosity DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-MOZZPLS1 UR - http://jacow.org/ipac2019/papers/mozzpls1.pdf ER - TY - CONF AU - Gupta, L. AU - Baturin, S. AU - Kim, Y.K. AU - Nagaitsev, S. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - Study of Integrable and Quasi-Integrable Sextupole Lattice J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - In order to maximize beam lifetime in circular particle accelerators, the nonlinear beam optics are optimized to maximize the dynamic aperture of the beam. The dynamic aperture (DA), which is a 6-D phase space volume of stable trajectories, depends on the strength of the nonlinearities in the machine, and is calculated via particle tracking. Current DA optimization processes include multi-objective genetic algorithm optimizers, and relies on minimizing the magnitudes of resonance driving terms (RDT), which are calculated from the nonlinear contribution to the one-turn-map. The process of searching through the parameter space for an ideal combination that maximizes DA is computationally strenuous. By setting up the sextupole channel such that it is resembles a symplectic integrator of a smooth Hamiltonian, with only a few sextupoles we are able to closely reproduce phase space trajectories of a smooth Hamiltonian up to the hyperbolic point. No chaos and resonances are observed if phase advance per one sextupole magnet in the channel does not exceed ~0.12x2 pi. Therefore, an important property of the suggested approach is the intrinsic elimination of the resonances, and minimization of corresponding RDTs. PB - JACoW Publishing CP - Geneva, Switzerland SP - 371 EP - 374 KW - sextupole KW - resonance KW - focusing KW - lattice KW - optics DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-MOPGW107 UR - http://jacow.org/ipac2019/papers/mopgw107.pdf ER - TY - CONF AU - Kuklev, N. AU - Kim, Y.K. AU - Nagaitsev, S. AU - Romanov, A.L. AU - Valishev, A. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - Experimental Demonstration of the Henon-Heiles Quasi-Integrable System at IOTA J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - The Integrable Optics Test Accelerator is a research electron and proton storage ring recently commissioned at the Fermilab Accelerator Science and Technology facility. Its research program is focused on testing novel techniques for improving beam stability and quality, notably the concept of non-linear integrable optics. In this paper, we report the first results of experimental investigation of a quasi-integrable transverse focusing system with one invariant of motion, a Henon-Heiles type system implemented with octupole magnets. Good agreement with simulations is demonstrated on key parameters of achievable tune spread and dynamic aperture preservation. Resilience to perturbations and imperfections in the lattice is explored. We conclude by outlining future research plans and discussing applicability to future high intensity accelerators. PB - JACoW Publishing CP - Geneva, Switzerland SP - 386 EP - 389 KW - octupole KW - experiment KW - lattice KW - optics KW - alignment DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-MOPGW113 UR - http://jacow.org/ipac2019/papers/mopgw113.pdf ER - TY - CONF AU - Arimoto, Y. AU - DiMarco, J. AU - Egawa, K. AU - Kawamoto, T. AU - Masuzawa, M. AU - Nogiec, J.M. AU - Ohsawa, Y. AU - Ohuchi, N. AU - Ueki, R. AU - Velev, G. AU - Wang, X. AU - Yamaoka, H. AU - Zong, Z.G. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - Magnetic Measurement With Single Stretched Wire Method on SuperKEKB Final Focus Quadrupoles J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - Superconducting-final-focus-quadrupole magnet system (QCS) were installed on an interaction region (IR) of SuperKEKB on Feb. 2017. The QCS consists of eight quadrupole magnets and four compensation solenoids; these magnets are contained in the two cryostats and are installed into Belle II detector which generates a solenoid field of 1.5 T. We determined the quadrupole centers with respect to accelerator beam lines with a single stretched wire (SSW) method. Here the results of the magnetic measurement with SSW are presented. PB - JACoW Publishing CP - Geneva, Switzerland SP - 432 EP - 435 KW - solenoid KW - quadrupole KW - detector KW - controls KW - interaction-region DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-MOPMP006 UR - http://jacow.org/ipac2019/papers/mopmp006.pdf ER - TY - CONF AU - Apollinari, G. AU - Ambrosio, G. AU - Carcagno, R.H. AU - Feher, SF. AU - Ristori, L. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - US Contributions to the High Luminosity LHC Upgrade - Focusing Quadrupoles and Crab Cavities J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - In the early 2000’s, the US High Energy Physics community contributing to the Large Hadron Collider (LHC) launched the LHC Accelerator R&D Program) (LARP), a long-vision focused R&D program, intended to bring the Nb₃Sn and other technologies to a maturity level that would allow applications in HEP machines. Around 2015, the technologies developed by LARP were mature enough to allow the spin-off of a major upgrade project to the LHC complex, the High Luminosity LHC (HL-LHC). This paper will focus on the US contribution to HL-LHC, namely the large-aperture low-beta focusing Nb₃Sn quadrupoles and the Radio Frequency Dipole (RFD) Crab Cavities, located in close proximity to the ATLAS and CMS experiments. This contribution, called the HL-LHC Accelerator Upgrade Project (HL-LHC AUP), focuses on production of these quadrupoles and cavities by sharing the work among a consortium of US Laboratories (FNAL, LBNL, BNL and SLAC) and Universities and in close connection with the CERN-led HL-LHC Collaboration. The collaboration achieved commonality of specifications and uniformity of performance. Final development of design, construction and first results from the prototypes are described to indi-cate the status of these critical components for HL-LHC. PB - JACoW Publishing CP - Geneva, Switzerland SP - 536 EP - 539 KW - cavity KW - luminosity KW - quadrupole KW - HOM KW - SRF DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-MOPMP040 UR - http://jacow.org/ipac2019/papers/mopmp040.pdf ER - TY - CONF AU - Plostinar, D.C. AU - Eshraqi, M. AU - Gålnander, B. AU - Lebedev, V.A. AU - Prior, C.R. AU - Sato, Y. AU - Tang, J.Y. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - Future High Power Proton Drivers for Neutrino Beams J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - Over the last two decades, significant efforts were made through several international studies to identify and develop technical solutions for potential Neutrino Factories and Superbeam Facilities. With many questions now settled, as well as clearer R&D needs, various proposals are being made for future facilities in China, Europe, Japan and North America. These include both developing and adapting existing machines as well as green-field solutions. In this paper, we review all the major accelerator programmes aimed at delivering high-power proton beams for neutrino physics. PB - JACoW Publishing CP - Geneva, Switzerland SP - 662 EP - 665 KW - linac KW - proton KW - operation KW - neutron KW - factory DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-MOPRB045 UR - http://jacow.org/ipac2019/papers/moprb045.pdf ER - TY - CONF AU - Lobach, I. AU - Halavanau, A. AU - Huang, Z. AU - Kim, K. AU - Lebedev, V.A. AU - Murokh, A.Y. AU - Nagaitsev, S. AU - Romanov, A.L. AU - Shaftan, T.V. AU - Stancari, G. AU - Valishev, A. AU - Yakimenko, V. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - Study of Fluctuations in Undulator Radiation in the IOTA Ring at Fermilab J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - We study turn-by-turn fluctuations in the number of emitted photons in an undulator, installed in the IOTA electron storage ring at Fermilab with an InGaAs PIN photodiode and an integrating circuit. Our study was motivated by the previous experiment *. We propose a theoretical model for the experimental data from * and in our own experiment we attempted to verify the model in an independent and more systematic way. Moreover, these fluctuations are an interesting subject for a study by itself, since they act as a seed for SASE in FELs. We improve the precision of the measurements from * by subtracting the average signal amplitude using a comb filter with a one-turn IOTA delay, and by using a special algorithm for noise subtraction. We obtain a reasonable agreement between our theoretical model and experiment. Along with repeating the experiment from *, which was performed at a constant beam current, we also collect data for fluctuations in undulator light at different beam current values. Lastly, in our experiment we were able to see the transition from Poisson statistics to Super-Poisson statistics for undulator light, whereas in * only the latter statistics was observed. PB - JACoW Publishing CP - Geneva, Switzerland SP - 777 EP - 780 KW - experiment KW - undulator KW - electron KW - radiation KW - photon DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-MOPRB088 UR - http://jacow.org/ipac2019/papers/moprb088.pdf ER - TY - CONF AU - Nagaitsev, S. AU - Arodzero, A. AU - Lobach, I. AU - Murokh, A.Y. AU - Romanov, A.L. AU - Ruelas, M. AU - Shaftan, T.V. AU - Stancari, G. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - Experimental Study of a Single Electron in a Storage Ring via Undulator Radiation J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - A single electron orbiting around a ring and emitting single quanta at the rate of about one event per hundred turns could produce a wealth of information about physical processes in large traps (i.e. storage rings) for charged particles. It should be noted that Paul and Penning traps in the 1980s led to the Nobel prize for studying state and motion of single quantum particles, and just recently the Penning trap technique has enabled the measurement of a single proton magnetic moment with an unprecedented precision of 10 decimal places. The information from the storage ring traps could also be used for characterization of a quantum system as well as the "trap" itself, i.e. measuring properties of the storage ring lattice and electron interaction with the laser fields. Although, the interest in single electron quantum processes today is mostly academic in nature, the diagnostics and methodology developed for single electron radiation studies could find subsequent applications in a variety of applied disciplines in quantum technology, including quantum communications and quantum computing. PB - JACoW Publishing CP - Geneva, Switzerland SP - 781 EP - 784 KW - photon KW - electron KW - undulator KW - experiment KW - radiation DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-MOPRB089 UR - http://jacow.org/ipac2019/papers/moprb089.pdf ER - TY - CONF AU - Montag, C. AU - Blaskiewicz, M. AU - Gianfelice-Wendt, E. AU - Hetzel, C. AU - Holmes, D. AU - Li, Y. AU - Lovelace III, H. AU - Ptitsyn, V. AU - Smith, K.S. AU - Tepikian, S. AU - Willeke, F.J. AU - Witte, H. AU - Xu, W. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - eRHIC Electron Ring Design Status J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - For the proposed electron-ion collider eRHIC, an electron storage ring will be installed in the existing RHIC tunnel. To reach the high luminosity of up to 10³⁴ cm⁻² sec⁻¹, beam currents up to 2.5A have to be stored. Besides high luminosity the physics program requires spin polarization levels of 70 percent, with both spin "up" and spin "down" orientations present in the fill. This is only feasible by using a full-energy spin polarized injector that replaces bunches faster than the depolarization rate. To limit the repetition rate of that injector to about one hertz, the polarization lifetime in the storage ring has to be maximized by proper spin matching and countermeasures for the machine misalignments. We will give an overview of the electron storage ring design. PB - JACoW Publishing CP - Geneva, Switzerland SP - 794 EP - 796 KW - polarization KW - electron KW - storage-ring KW - solenoid KW - radiation DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-MOPRB093 UR - http://jacow.org/ipac2019/papers/moprb093.pdf ER - TY - CONF AU - Stratakis, D. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - A Parameter Study for Improving the Performance of the Production Target for the Fermilab Muon g-2 Experiment J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - The target station of the Muon g-2 Experiment is one of the central pieces for the production of secondary pions which eventually will decay to the desired mu-ons. In this paper, we report adjustments made to opti-mize its performance. For instance, in the simulation we vary the size of the primary incoming beam and examine its impact on the downstream production. We then compare this with the actual measured beam size upstream of the target. In addition, we examine the sensitivity in performance with the strength of the lithium lens for pion capture and the distance between lens and target. We compare measured data with simu-lation results. PB - JACoW Publishing CP - Geneva, Switzerland SP - 806 EP - 809 KW - target KW - simulation KW - experiment KW - storage-ring KW - proton DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-MOPRB104 UR - http://jacow.org/ipac2019/papers/moprb104.pdf ER - TY - CONF AU - Ramirez, A. AU - Stratakis, D. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - Measurement and Analysis of Beam Phase-space Distributions for the Fermilab Muon Campus accelerator complex J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - The Muon g-2 experiment at Fermilab is tasked with measuring the muon’s anomalous magnetic moment with high precision. Since the experiment requires large amounts of muons, it is imperative to systematically study the behavior of the beam along the transport line. Unfortunately, the available diagnostics only provide beam information in X-Y space. For a complete evaluation, information of the phase-space is required. This paper demonstrates a technique to measure the beam phase-space distribution by using a set of beam profiles. First, we establish the theoretical framework that describes the principle of the technique. Next, we apply the technique at four different locations along the accelerator delivery line. Finally, we compare our findings to predictions from tracking simulations. Our results indicate that the beam phase-space volume is conserved, along the beam delivery line, suggesting minimal loses and linear transport as expected by design. Compared to the simulations, there is good agreement in both horizontal and vertical plane with the former being at the 4% level while the latter being in the 15% level. Our proposed technique is expected to provide a promising approach for optimizing injection and thereby improving the performance of the Muon g-2 Experiment. PB - JACoW Publishing CP - Geneva, Switzerland SP - 810 EP - 813 KW - quadrupole KW - emittance KW - framework KW - experiment KW - simulation DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-MOPRB105 UR - http://jacow.org/ipac2019/papers/moprb105.pdf ER - TY - CONF AU - Perini, D. AU - Crawford, D.J. AU - Feng, J. AU - Gobbi, G. AU - Li, Z. AU - Liu, W. AU - Ruan, J. AU - Shao, W. AU - Stancari, G. AU - Valerio, L.R. AU - Wang, J. AU - Wang, Y. AU - Yang, Y. AU - Zhang, K. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - The Development Programme of Cathodes and Electron Guns for the Hollow Electron Lenses of the High Luminosity LHC Project J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - The High Luminosity LHC project (HL-LHC) foresees the construction and installation of important new equipment to increase the performance of the LHC machine. The Hollow Electron Lens (HEL) is a promising system to control the beam halo. It improves the beam collimation system of the HL-LHC and mitigates possible equipment damage in case of failure scenarios from halo losses. The halo can store up to 30 MJ energy. The specifications for this new device are quite demanding. The source, an electron gun with an annular shaped cathode, has to deliver a current up to 5 A. This is five times higher than the current in the existing electron lenses in Fermi and Brookhaven national laboratories. This note describes the programme carried out to design and test high-perveance guns equipped with two types of high-performance scandate cathodes. The size of the final gun is now considerably smaller than the one of the first prototype, allowing a reduction of diameter and cost of the superconducting magnet system used to steer the electron beam. The tests carried out at FNAL, BVERI and BJUT demonstrated that the developed cathodes fulfil the specifications and can supply a 5 A fully Space Charge Limited (SCL) current. PB - JACoW Publishing CP - Geneva, Switzerland SP - 1102 EP - 1105 KW - cathode KW - electron KW - gun KW - luminosity KW - proton DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-MOPTS099 UR - http://jacow.org/ipac2019/papers/mopts099.pdf ER - TY - CONF AU - Lari, L. AU - Cerutti, F. AU - Esposito, L.S. AU - Garcia, F.G. AU - He, Y. AU - Kourbanis, I. AU - Mokhov, N.V. AU - Pozdeyev, E. AU - Rakhno, I.L. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - FLUKA-MARS15 Simulations To Optimize the Fermilab PIP-II Movable Beam Absorber J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - PIP-II is the Fermilab’s flagship project to provide powerful, high-intensity proton beams to the laboratory’s experiments. The heart of the PIP-II project is an H⁻ 800 MeV superconducting linear accelerator. In order to commission the beam and operate safely the linac, several constraints were evaluated. The design of a movable 5 kW beam absorber was finalized to allow staged beam commissioning in different linac locations. Prompt and residual radiation levels were calculated, and radiation shields were optimized to keep those values within the acceptable levels in the areas surrounding beam absorber. Monte Carlo calculations with FLUKA and MARS15 codes are presented in the paper to support these studies. PB - JACoW Publishing CP - Geneva, Switzerland SP - 1136 EP - 1139 KW - linac KW - MMI KW - shielding KW - radiation KW - simulation DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-MOPTS110 UR - http://jacow.org/ipac2019/papers/mopts110.pdf ER - TY - CONF AU - Halavanau, A. AU - Huang, Z. AU - Lobach, I. AU - Nagaitsev, S. AU - Pellegrini, C. AU - Raubenheimer, T.O. AU - Seipt, D. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - Undulator Radiation Generated by a Single Electron J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - The facilities providing single electron beams are currently being commissioned at Fermilab and will be at SLAC. Recently, Fermilab’s IOTA ring routinely demonstrated circulation of a single electron at 100 MeV beam energy. Alternatively, SLAC is working on constructing LCLS-II an X-ray FEL driven by a 4 GeV SRF linac. A parasitic beamline, S30XL, is planned that will extract 4 GeV dark current from between the primary LCLS-II electron bunches. The dark current will be delivered to End Station A and can work independently of LCLS-II experiments. The dark current will be bunched at a frequency of 46 MHz while extracted current varied from single electrons to 10’s of nA. In the present paper, we estimate the feasibility of propagating single electron beams through a conventional undulator, placed in the IOTA and S30XL beamlines. We explore the possible observable effects and experimental parameters range. In addition, we focus on potential applications of such beams in systems for high fidelity quantum measurements. PB - JACoW Publishing CP - Geneva, Switzerland SP - 1867 EP - 1870 KW - electron KW - undulator KW - photon KW - experiment KW - radiation DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-TUPRB089 UR - http://jacow.org/ipac2019/papers/tuprb089.pdf ER - TY - CONF AU - Mohsen, O. AU - Dhuley, R. AU - Geelhoed, M.G. AU - McKeown, A. AU - Mihalcea, D. AU - Piot, P. AU - Salehinia, I. AU - Thangaraj, J.C.T. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - Simulations and Experimental Plans for a High-Repetition-Rate Field-Enhanced Conduction-Cooled Superconducting RF Electron Source J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - We present a novel RF design for a field enhanced electron source driven by field emission cathodes. The proposed electron source relies on the enhanced high electric field gradients at the cathode to simultaneously extract and accelerate electrons. The system will be tested in a conduction-cooled superconducting radio-frequency cavity recently demonstrated at Fermilab. In this paper, we present electromagnetic and thermal simulations of the setup that support the feasibility of the design. PB - JACoW Publishing CP - Geneva, Switzerland SP - 2113 EP - 2116 KW - cavity KW - electron KW - cathode KW - SRF KW - simulation DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-TUPTS083 UR - http://jacow.org/ipac2019/papers/tupts083.pdf ER - TY - CONF AU - Mohsen, O. AU - Divan, R. AU - Korampally, V. AU - Lueangaramwong, A. AU - Piot, P. AU - Sumant, A.V. AU - Valluri, V. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - Performances of Silicon-Based Field-Emission Cathodes Coated with UltraNano Crystalline Diamond J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - Field-emission electron sources have been considered as possible candidates for the production of bright or high-current electron bunches. In this paper, we report on the experimental characterization of silicon-based field-emitter arrays (FEA) in a DC high voltage gap. The silicon cathodes are produced via a simple self-assembling process. The measurement reported in this paper especially compares the field-emission properties of a nanostructured and planar diamond-coated Si-based cathode. PB - JACoW Publishing CP - Geneva, Switzerland SP - 2117 EP - 2120 KW - cathode KW - electron KW - experiment KW - vacuum KW - simulation DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-TUPTS084 UR - http://jacow.org/ipac2019/papers/tupts084.pdf ER - TY - CONF AU - Xu, T. AU - Jing, C.-J. AU - Kanareykin, A. AU - Piot, P. AU - Power, J.G. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - Spatio-Temporal Shaping of the Photocathode Laser Pulse for Low-Emittance Shaped Electron Bunches J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - Photocathode laser shaping techniques to generate temporally shaped electron bunches are appealing owing to their simplicity. Such technique is being considered to form shaped electron bunches to enhance the transformer ratio in beam-driven accelerators. At low energy (i.e. during the emission process) the transverse and longitudinal space charge effects are coupled so that attaining a low beam transverse emittance require the laser to be spatiotemporal shaped. In this paper, we explore the generation of a linearly-ramped bunch with optimized transverse emittance by temporally and radially shaping the laser pulse to provide an adequate initial distribution. We discuss a possible implementation of the optical shaping technique and describe a planned experiment. PB - JACoW Publishing CP - Geneva, Switzerland SP - 2163 EP - 2166 KW - laser KW - electron KW - cathode KW - emittance KW - simulation DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-TUPTS104 UR - http://jacow.org/ipac2019/papers/tupts104.pdf ER - TY - CONF AU - Ader, C.R. AU - Alvarez, M.L. AU - Batko, J.S. AU - Campos, R. AU - McGee, M.W. AU - Watts, A.C. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - Accelerator Vacuum Windows: A Review of Past Research and a Strategy for the Development of a New Design for Improved Safety and Longevity for Particle Accelerators J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - Vacuum window research continues at Fermilab and this paper will examine cost effective, consistent designs which can have a significant impact on accelerator laboratories in terms of safety and cost. Issues such as the design, materials, analysis, testing and fabrication are addressed, including beam scattering and materials cost-benefit analysis and examining potential material substitutes for beryllium. A previous research paper has examined current fabrication and design techniques and also failure modes at Fermi, and this paper focuses on emerging and novel technologies for vacuum window fabrication. Many different paths have been taken by High Energy Physics (HEP) Laboratories throughout the world with varying success. The history of vacuum window development is extensive and not well defined, and a matrix of the research already completed on materials and joint design for vacuum windows will be shown. This report finally includes a treatise for vacuum window technology and a view towards emerging designs and materials and discusses future advances of research such as fabrication techniques including additive manufacturing and ultrasonic welding. Further exploration into these would prove beneficial to developing vacuum windows that are safer and stronger while being more transparent to the beam. PB - JACoW Publishing CP - Geneva, Switzerland SP - 2237 EP - 2239 KW - vacuum KW - Windows KW - radiation KW - experiment KW - scattering DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-WEXXPLS2 UR - http://jacow.org/ipac2019/papers/wexxpls2.pdf ER - TY - CONF AU - Sterbini, G. AU - Amorim, D. AU - Bartosik, H. AU - Bertarelli, A. AU - Bruce, R. AU - Buffat, X. AU - Carra, F. AU - Carver, L.R. AU - Cattenoz, G. AU - Effinger, E. AU - Fartoukh, S.D. AU - Fitterer, M. AU - Fuster-Martínez, N. AU - Gonzalez-Berges, M. AU - Gorzawski, A.A. AU - Gąsior, M. AU - Hemelsoet, G.H. AU - Hostettler, M. AU - Iadarola, G. AU - Jones, O.R. AU - Kaltchev, D. AU - Karastathis, N. AU - Kostoglou, S. AU - Lamas Garcia, I. AU - Levens, T.E. AU - Levichev, A.E. AU - Medina Medrano, L.E. AU - Mirarchi, D. AU - Olexa, J. AU - Papadopoulou, S. AU - Papaphilippou, Y. AU - Pellegrini, D. AU - Pojer, M. AU - Ponce, L. AU - Poyet, A. AU - Redaelli, S. AU - Rossi, A. AU - Salvachua, B. AU - Schmickler, H. AU - Schmidt, F. AU - Skoufaris, K. AU - Solfaroli, M. AU - Tomás, R. AU - Trad, G. AU - Valishev, A. AU - Valuch, D. AU - Xu, C. AU - Zamantzas, C. AU - Zisopoulos, P. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - First Results of the Compensation of the Beam-Beam Effect with DC Wires in the LHC J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - The compensation of the long-range beam-beam interactions using DC wires is presently under study as an option for enhancing the machine performance in the frame of the High-Luminosity LHC project (HL-LHC). The original idea dates back more than 15 years. After the installation of four wire prototypes in the LHC in 2018, a successful experimental campaign was performed during the last months. The experimental setup and the main results are reported in this paper. PB - JACoW Publishing CP - Geneva, Switzerland SP - 2262 EP - 2265 KW - experiment KW - beam-beam-effects KW - operation KW - collider KW - simulation DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-WEYYPLM3 UR - http://jacow.org/ipac2019/papers/weyyplm3.pdf ER - TY - CONF AU - Tan, W.H. AU - Piot, P. AU - Zholents, A. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - Longitudinal-Phase-Space Manipulation for Efficient Beam-Driven Structure Wakefield Acceleration J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - Collinear beam-driven structure wakefield acceleration (SWFA) is an advanced acceleration technique that could support the compact generation of high-energy beams for future multi-user x-ray free-electron-laser facilities*. Producing an ideal shaped drive beam through phase space manipulation is crucial for an efficient SWFA. Controlling the final longitudinal-phase space of the drive beam necessitate staged beam manipulations during acceleration. This paper describes the preliminary design of an accelerator beamline capable of producing drive beam with tailored current distribution and longitudinal-phase-space correlation. The proposed design is based on simple analytical models combined in a 1-D longitudinal beam-dynamics simulation tracking program supporting forward and backward (time reversal) tracking. PB - JACoW Publishing CP - Geneva, Switzerland SP - 2296 EP - 2299 KW - wakefield KW - linac KW - electron KW - simulation KW - acceleration DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-WEZZPLS3 UR - http://jacow.org/ipac2019/papers/wezzpls3.pdf ER - TY - CONF AU - Alvarez, M.L. AU - Deshpande, A. AU - Hunden, K.R. AU - Nagaslaev, V.P. AU - Pirtle, E. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - Mu2e Electrostatic Septa Volumetric Exchange of Fc-40 Dielectric in High Radiation Environments J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - Two electrostatic septa (ESS) are being designed for the slow extraction of 8 GeV proton beam for the Mu2e experiment at Fermilab. Special attention is given to the high voltage feedthrough (HVF), which energizes the cathode creating the bending field. The FC-40 dielectric fluid, surrounding the HV cable breaks down from radiation exposure, which reduces its insulating capabilities. The new HVF design focuses on effective replacement of the exposed fluid and eliminating the stagnant areas of low exchange rate. A preliminary test using a fully transparent prototype HVF and water was conducted to understand the volumetric exchange rate of the high radiation region. Here we discuss the results of these tests and further studies using the FC-40. PB - JACoW Publishing CP - Geneva, Switzerland SP - 2434 EP - 2436 KW - radiation KW - GUI KW - septum KW - cathode KW - extraction DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-WEPMP044 UR - http://jacow.org/ipac2019/papers/wepmp044.pdf ER - TY - CONF AU - Nagaslaev, V.P. AU - Brown, K.A. AU - Tomizawa, M. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - Higher Multipoles in 3rd Integer Resonance Extraction J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - The efficiency of slow extraction is becoming a limiting factor, as the demand for delivered beam power is constantly growing. New methods for improving extraction efficiency include folding the extraction separatrix using the higher multipoles. In this report we discuss a simple and effective approach to determine an optimal placement of those multipoles in the storage ring. This allows reduction of the beam losses and therefore, the level of prompt and residual radioactivity in the accelerator components and surrounding buildings by as much as 40% or more. We also explore here manipulating the higher order effects produced in the pure sextupole configurations for the same purpose and demonstrate that similar results can be achieved by only rearranging the sextupole magnets in the lattice. PB - JACoW Publishing CP - Geneva, Switzerland SP - 2437 EP - 2439 KW - extraction KW - octupole KW - sextupole KW - multipole KW - simulation DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-WEPMP045 UR - http://jacow.org/ipac2019/papers/wepmp045.pdf ER - TY - CONF AU - Dudnikov, V.G. AU - Cummings, M.A. AU - Johnson, R.P. AU - Popovic, M. AU - Thurman-Keup, R.M. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - Development of a Beam Halo Monitor J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - Our innovative approach is to design the Beam Halo Monitor, where beam induced synchrotron radiation will be used to monitor the beam Halo. This involves an original scheme of light collection using a coronograph for measuring beam halo. PB - JACoW Publishing CP - Geneva, Switzerland SP - 2721 EP - 2723 KW - radiation KW - synchrotron-radiation KW - synchrotron KW - electron KW - optics DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-WEPGW099 UR - http://jacow.org/ipac2019/papers/wepgw099.pdf ER - TY - CONF AU - Kuklev, N. AU - Jarvis, J.D. AU - Kim, Y.K. AU - Romanov, A.L. AU - Santucci, J.K. AU - Stancari, G. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - Synchrotron Radiation Beam Diagnostics at IOTA - Commissioning Performance and Upgrade Efforts J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - The Integrable Optics Test Accelerator is a research electron and proton storage ring recently commissioned at the Fermilab Accelerator Science and Technology facility. A key part of its beam diagnostics suite are synchrotron radiation monitors, used for measuring transverse beam profile, position, and intensity. In this paper, we report on the performance and uses of this system during the year 1 run. We demonstrate sub-100nm statistical beam position uncertainty and high dynamic range from 10⁹ electrons down to a single electron. Commissioning challenges and operational issues are discussed. We conclude by outlining current upgrade efforts, including improved modularity, small emittance measurements, and a multi-anode photomultiplier system for turn-by-turn acquisition. PB - JACoW Publishing CP - Geneva, Switzerland SP - 2732 EP - 2735 KW - electron KW - optics KW - radiation KW - experiment KW - detector DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-WEPGW103 UR - http://jacow.org/ipac2019/papers/wepgw103.pdf ER - TY - CONF AU - Prebys, E. AU - Dyshkant, A.S. AU - Gaponenko, A. AU - Hedin, D. AU - Hooper, R.J. AU - Jones, M. AU - Nguyen, T.M. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - Statistical Measurement of Longitudinal Beam Halo in Fermilab Recycler J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - The formation of non-Gaussian halo in both the transverse and longitudinal dimensions of beam bunches has been notoriously difficult both the model and to measure. We present a technique to measure the longitudinal halo of 2.5 MHz bunches in the Fermilab Recycler, which have been formed for the g-2 anomalous magnetic moment experiment. While out of time beam is not a particular concern to this experiment, it is a key issue for the subsequent Mu2e rare muon decay experiment, which will use the same bunch formation procedure. Our measurement relies on a statistical technique, in which a small fraction of the beam is scattered from the primary collimation foil in the recycler, and then is detected by a charge telescope consisting of quartz Cherenkov radiators and photomultiplier tubes. By integrating over many revolutions, the time profile of longitudinal halo (out-of-time beam) can be measured down to less than a 10⁻⁵ fractional level, relative to in-time beam. These results can then be compared to simulations. PB - JACoW Publishing CP - Geneva, Switzerland SP - 2742 EP - 2744 KW - experiment KW - detector KW - data-acquisition KW - booster KW - scattering DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-WEPGW106 UR - http://jacow.org/ipac2019/papers/wepgw106.pdf ER - TY - CONF AU - Yonehara, K. AU - Cummings, M.A. AU - Johnson, R.P. AU - Kazakevich, G.M. AU - Moretti, A. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - Radiation Robust RF Gas Beam Detector R&D for Intensity Frontier Experiments J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - A novel radiation robust RF gas beam detector has been demonstrated by using the Main Injector beam at Fermilab. The detector demonstrated a stable signal gain, fast response time, and high radiation resistivity with intense proton beams. The plasma process in the detector is studied to validate the plasma physics model. The result suggests that the detector is applicable for Long Baseline Neutrino Facility at Fermilab. To prepare for the LBNF, a proto type detector will be made and applied for the Neutrino at Main Injector target system. Progress of the project will be given in the presentation. PB - JACoW Publishing CP - Geneva, Switzerland SP - 2770 EP - 2772 KW - detector KW - cavity KW - GUI KW - plasma KW - electron DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-WEPGW115 UR - http://jacow.org/ipac2019/papers/wepgw115.pdf ER - TY - CONF AU - Bafia, D. AU - Checchin, M. AU - Gonnella, D. AU - Grassellino, A. AU - Martinello, M. AU - Melnychuk, O.S. AU - Palczewski, A.D. AU - Posen, S. AU - Romanenko, A.S. AU - Sergatskov, D.A. AU - Zasadzinski, J. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - Understanding and Pushing the Limits of Nitrogen Doping J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - This work will describe Fermilab experiments that focus on the optimization of doping parameters to achieve low sensitivity to trapped magnetic flux while maintaining very high Q characteristic of nitrogen doped cavities and same or higher quench fields. Working partially in the context of LCLS-2 higher energy upgrade, new doping recipes are pursued and have been found to vary the mean free path of the resonator which is related to the sensitivity to trapped magnetic flux. Moreover, a correlation has been found between lighter doping and higher quench fields while maintaining sufficiently low surface resistance. PB - JACoW Publishing CP - Geneva, Switzerland SP - 3078 EP - 3081 KW - cavity KW - SRF KW - niobium KW - experiment KW - ECR DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-WEPRB114 UR - http://jacow.org/ipac2019/papers/weprb114.pdf ER - TY - CONF AU - Sadovich, S. AU - Rossi, A. AU - Stancari, G. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - Electron Beam Dynamics Simulation for Electron Lenses J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - A test stand is under construction at CERN to study high perveance electron guns, electron beam dynamics, and electron beam diagnostics for electron lenses. It will be used to test electron guns for the Hollow Electron Lenses under consideration for beam halo control for High Luminosity LHC (CERN), and for the Space Charge Compensation at SIS18 (GSI) in the frame of the EU funded ARIES project. In order to prepare for this test stand, simulations will be presented and compared with experiments undertaken at the Fermilab (FNAL) electron lens test stand. These were conducted using a hollow electron gun, with the magnetic field configuration and beam current varied to study their effect. The impact of imperfections on the beam dynamics and overall quality of the electron beam will be discussed. A method for comparing experimental data with simulation is also presented to allow bench-marking of the computer models and simulation tools that will later be applied to the analysis of measurements performed at CERN. PB - JACoW Publishing CP - Geneva, Switzerland SP - 3220 EP - 3223 KW - electron KW - gun KW - simulation KW - cathode KW - experiment DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-WEPTS048 UR - http://jacow.org/ipac2019/papers/wepts048.pdf ER - TY - CONF AU - Hall, C.C. AU - Bruhwiler, D.L. AU - Edelen, J.P. AU - Kuklev, N. AU - Romanov, A.L. AU - Valishev, A. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - First Measurements of Nonlinear Decoherence in the IOTA Ring J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - The Integrable Optics Test Accelerator (IOTA), at Fermi National Laboratory is aimed at testing nonlinear optics for the next generation of high intensity rings. Through use of a special magnetic element the ring is designed to induce a large tune spread with amplitude while maintaining integrable motion. This will allow for the suppression of instabilities in high-intensity beams without significant reduction in dynamic aperture. One important aspect of this is the nonlinear decoherence that occurs when a beam is injected off axis or receives a transverse kick while circulating in the ring. This decoherence has been studied in detail, with simulations, for protons in IOTA both with and without space-charge. However, it has yet to be demonstrated experimentally. During the first phase of the IOTA experimental program, the ring is operated with 100 MeV electrons, allowing for the study of nonlinear optics without the complications introduced by space charge. Here we present measurements taken during the IOTA commissioning, and an analysis of the results. PB - JACoW Publishing CP - Geneva, Switzerland SP - 3286 EP - 3288 KW - lattice KW - kicker KW - experiment KW - damping KW - optics DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-WEPTS070 UR - http://jacow.org/ipac2019/papers/wepts070.pdf ER - TY - CONF AU - Park, C.S. AU - Chattopadhyay, S. AU - Freemire, B.T. AU - Mitchell, C.E. AU - Ryne, R.D. AU - Stern, E.G. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - Multipass Simulations of Space Charge Compensation using Electron Columns at IOTA J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - Defocusing repulsive forces due to self space charge fields lead to degradation of high-intensity particle beams. Being of particular concern for low- and medium-energy proton beams, they result in emittance growth, beam halo formation, and beam loss. They set stringent limits on the intensity of frontier accelerators; therefore, the mitigation of space charge effects is a crucial challenge to improve proton beam intensity. The space charge effects in a positively charged proton beam can be effectively compensated using negatively charged electron columns. In this paper, we present the results of simulations using Synergia of the Electron Column lattice for IOTA. Beam loss due to space charge effects and aperture restrictions have been studied, as well as bunch formation and matching using an adiabatic ramp of the RF cavity. The results show the need for space charge compensation, and provide the basis for integration of the Synergia and Warp codes in order to form a complete simulation of space charge compensation using an Electron Column in IOTA. PB - JACoW Publishing CP - Geneva, Switzerland SP - 3313 EP - 3316 KW - space-charge KW - electron KW - simulation KW - cavity KW - proton DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-WEPTS083 UR - http://jacow.org/ipac2019/papers/wepts083.pdf ER - TY - CONF AU - Xu, T. AU - Conde, M.E. AU - Ha, G. AU - Kuriki, M. AU - Piot, P. AU - Power, J.G. AU - Wisniewski, E.E. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - Generation High-Charge of Flat Beams at the Argonne Wakefield Accelerator J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - Beams with large transverse emittance ratios (flat beams)have received renewed interest for their possible applications in future linear colliders and advanced accelerators. A flat beam can be produced by generating a magnetized beam and then repartitioning its emittance using three skew quadrupoles. In this paper, we report on the experimental generation of∼1nC flat beams at the Argonne WakefieldAccelerator (AWA). The emittance ratio of the flat beam is demonstrated to be continuously variable by adjusting the magnetic field on the cathode. PB - JACoW Publishing CP - Geneva, Switzerland SP - 3337 EP - 3340 KW - emittance KW - solenoid KW - electron KW - quadrupole KW - experiment DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-WEPTS094 UR - http://jacow.org/ipac2019/papers/wepts094.pdf ER - TY - CONF AU - Manczak, J. AU - Neuffer, D.V. AU - Stratakis, D. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - Passive Absorbers for Maximizing the Performance of the Mu2e-II Experiment J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - The Fermilab’s Mu2e experiment is designed to search for Charged Lepton Flavour Violation in direct, neutrinoless conversion of muon into electron in the presence of a nucleus’ electromagnetic field. Quantity, which is going to be observed is the ratio between the rate of the above BSM (Beyond Standard Model) reaction and the rate of the standard muon capture on the nucleus. The measurement precision is expected to reach up to 10⁻¹⁷. Mu2e-II is the codename for the second phase of the experiment planned to run with the lower energy, higher intensity primary proton beam provided by PIP-II accelerator, currently under construction. The ionization cooling with a wedge absorber is introduced to Mu2e-II setup for potential increase in the number of low momentum muons reaching the target. The study is made into the position and size of the wedge inside the beamline using G4Beamline simulation framework. Results show an increase up to 12% for muons with momentum P below 30 MeV/c and 7% for muons with P<40 MeV/c when the beam is measured right after the wedge. Further studies are necessary to investigate how this gain can be delivered to the stopping target. PB - JACoW Publishing CP - Geneva, Switzerland SP - 3345 EP - 3348 KW - target KW - experiment KW - solenoid KW - proton KW - collimation DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-WEPTS099 UR - http://jacow.org/ipac2019/papers/wepts099.pdf ER - TY - CONF AU - Harkay, K.C. AU - Abid, I.A. AU - Berenc, T.G. AU - Berg, W. AU - Blednykh, A. AU - Borland, M. AU - Brill, A.R. AU - Bromberek, D.J. AU - Byrd, J.M. AU - Calvey, J.R. AU - Carvelli, J. AU - Dooling, J.C. AU - Emery, L. AU - Fors, T. AU - Fystro, G.I. AU - Goel, A. AU - Hui, D. AU - Keane, R.T. AU - Laird, R. AU - Lenkszus, F. AU - Lindberg, R.R. AU - Lumpkin, A.H. AU - Madden, T.J. AU - Micklich, B.J. AU - Morrison, L.H. AU - Pasky, S.J. AU - Sajaev, V. AU - Sereno, N. AU - Shang, H. AU - Smith, T.L. AU - Stevens, J.B. AU - Sun, Y. AU - Waldschmidt, G.J. AU - Wang, J. AU - Wienands, U. AU - Wootton, K.P. AU - Xiao, A. AU - Yang, B.X. AU - Yang, Y. AU - Yao, C. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - High-Charge Injector for on-Axis Injection Into A High-Performance Storage Ring Light Source J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - Next-generation, high-performance storage ring light sources based on multibend achromat optics will require on-axis injection because of the extremely small dynamic aperture. Injectors will need to supply full-current bunch replacement in the ring with high single-bunch charge for swap-out. For upgrades of existing light sources, such as the Advanced Photon Source Upgrade (APS-U), it is economical to retain the existing injector infrastructure and make appropriate improvements. The challenges to these improvements include achieving high single-bunch charge in the presence of instabilities, beam loading, charge stability and reliability. In this paper, we discuss the rationale for the injector upgrades chosen for APS-U, as well as backup and potential alternate schemes. To date, we have achieved single-bunch charge from the injectors that doubles the original design value, and have a goal to achieve about three times the original design value. PB - JACoW Publishing CP - Geneva, Switzerland SP - 3423 EP - 3426 KW - booster KW - injection KW - synchrotron KW - storage-ring KW - emittance DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-THYYPLM3 UR - http://jacow.org/ipac2019/papers/thyyplm3.pdf ER - TY - CONF AU - Shiltsev, V.D. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - 2019 Nishikawa Tetsuji Prize Talk J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - For his original work on electron lenses in synchrotron colliders, his outstanding contribution to the construction and operation of high-energy, high-luminosity hadron colliders and for his tireless leadership in the accelerator community. PB - JACoW Publishing CP - Geneva, Switzerland SP - 3439 EP - 3443 KW - electron KW - collider KW - proton KW - operation KW - experiment DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-THAPLM3 UR - http://jacow.org/ipac2019/papers/thaplm3.pdf ER - TY - CONF AU - Prebys, E. AU - Abergel, R.J. AU - Casey, W.H. AU - Cebra, D.A. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - Development of 211-Astatine Production in the Crocker Nuclear Laboratory Cyclotron J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - There is a great deal of interest in the medical community in the use of the alpha-emitter 211-At as a therapeutic isotope. Among other things, its 7.2 hour half life is long enough to allow for recovery and labeling, but short enough to avoid long term activity in patients. Unfortunately, the only practical technique for its production is to bombard a 209-Bi target with a ~29 MeV alpha beam, so it is not accessible to commercial isotope production facilities, which all use fixed energy proton beams. The US Department of Energy is therefore supporting the development of a "University Isotope Network" (UIN) to satisfy this need. Our prposoal is to retrofit the variable-energy, multi-species cyclotron at the Crocker Nuclear Laboratory at the University of California Davis with an internal Bi-209 target, such that we can put at least 100 uA of 29 MeV alpha particles on target without concerns about extraction efficiency. Using very conservative assumptions, we are confident we will be able to produce 60 mCi of 211-At in solution in an eight hour shift, which includes setup, exposure, and chemical recovery. This poster will cover the design of the target, as well as the required chemical processing and reliability upgrades. PB - JACoW Publishing CP - Geneva, Switzerland SP - 3564 EP - 3567 KW - target KW - cyclotron KW - operation KW - proton KW - extraction DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-THPMP051 UR - http://jacow.org/ipac2019/papers/thpmp051.pdf ER - TY - CONF AU - Deshpande, A. AU - Anderson, K. AU - Gollwitzer, K.E. AU - Hartsell, B.D. AU - Hylen, J. AU - Sidorov, V.I. AU - Tariq, S. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - LBNF Hadron Absorber: Updated Mechanical Design and Analysis for 2.4 MW Operation J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - The Long-Baseline Neutrino Facility (LBNF) Hadron Absorber is located downstream of the decay pipe. It consists of actively cooled aluminum and steel blocks surrounded by steel and concrete shielding. Majority of the beam power is deposited in the absorber core which is water cooled. The surrounding steel and concrete shielding are air-cooled. The absorber provides radiation protection to personnel and keeps soil and ground activation levels to below allowable limits. It is designed for 2.4 MW beam operations. The total heat load deposited into the absorber is approximately 400 kW. The current design considers the longer 4-interaction length target of the optimized beam design. In addition, the ‘bafflette’ around the target reduces the energy deposited into the absorber. For this reason, the sculpting in the aluminum core blocks, which was in the previous design, was removed, making the design uniform and less complicated. In addition, the uniformity of the absorber makes it easier to understand the muon monitor data. Steady state thermal, structural, and Computational Fluid Dynamics (CFD) analysis of critical absorber aluminum and steel components during steady state operations is discussed herein. A similar analysis for a 120 GeV, 10 µs pulse, accident condition is also discussed. A preliminary design for the accident pulse prevention system that protects the absorber is also described. PB - JACoW Publishing CP - Geneva, Switzerland SP - 4078 EP - 4080 KW - operation KW - hadron KW - site KW - simulation KW - shielding DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-THPRB108 UR - http://jacow.org/ipac2019/papers/thprb108.pdf ER - TY - CONF AU - Kashikhin, V.V. AU - Lombardo, V. AU - Velev, G. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - Magnet Design Optimization for Future Hadron Colliders J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - Fermilab in collaboration with other members of the US Magnet Development Program (MDP) is working on the development of accelerator magnets for future hadron colliders. A 4-layer, 15-T dipole with 60 mm aperture based on Nb₃Sn Low Temperature Superconductor (LTS) has been fabricated and tested. It is an important milestone of demonstrating readiness of the LTS magnet technology for the next generation of hadron colliders. At the same time, design studies aimed at boosting the magnet performance even further with the help of High Temperature Superconductors (HTS) are under way. This paper introduces a novel magnet technology - Conductor On Molded Barrel (COMB) optimized for the HTS materials and discusses possible steps towards its demonstration. PB - JACoW Publishing CP - Geneva, Switzerland SP - 4307 EP - 4310 KW - dipole KW - collider KW - hadron KW - magnet-design KW - power-supply DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-THPTS084 UR - http://jacow.org/ipac2019/papers/thpts084.pdf ER - TY - CONF AU - Velev, G. AU - Ambrosio, G. AU - Barzi, E.Z. AU - Kashikhin, V.V. AU - Krave, S. AU - Lombardo, V. AU - Novitski, I. AU - Stoynev, S. AU - Turrioni, D. AU - Xu, X. AU - Zlobin, A.V. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - Fermilab Superconducting Nb₃Sn High Field Magnet R&D Program J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - Magnets based on the modern Nb₃Sn conductor are the main candidates for future high-energy hadron colliders. Fermilab as part of the U.S. MDP executes an extensive R&D program on these high-field magnets. This program includes basic conductor and material R&D, quench per-formance studies, and building a meter-long high-field demonstrator. This paper summarizes the current status of the program including its recent results. PB - JACoW Publishing CP - Geneva, Switzerland SP - 4338 EP - 4341 KW - dipole KW - operation KW - collider KW - status KW - proton DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-THPTS099 UR - http://jacow.org/ipac2019/papers/thpts099.pdf ER - TY - CONF AU - Velev, G. AU - Ambrosio, G. AU - Chlachidze, G. AU - DiMarco, J. AU - Stoynev, S. AU - Strauss, T. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - Measurements of Decay and Snapback in Nb₃Sn Accelerator Magnets at Fermilab J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - In recent years, Fermilab has been executing an inten-sive R&D program on Nb₃Sn accelerator magnets. This program has included dipole and quadrupole models and demonstrators for various programs and projects, including the HL-LHC accelerator upgrade project. A systematic study of the field decay and snapback during the injection portion of a simulated accelerator cycle was executed at the Fermilab Magnet Test Facility. This paper summarizes the recent measurements of the MQXFS1 short quadrupole model and discusses the results of some previously measured Nb₃Sn magnets at CERN PB - JACoW Publishing CP - Geneva, Switzerland SP - 4342 EP - 4345 KW - dipole KW - injection KW - quadrupole KW - sextupole KW - luminosity DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-THPTS100 UR - http://jacow.org/ipac2019/papers/thpts100.pdf ER -