TY - CONF AU - Tsoupas, N. AU - Abell, D.T. AU - Bailey, V.L. AU - Joshi, P.N. AU - Lidestri, J.P. AU - Méot, F. AU - Sinnott, M. AU - Trbojevic, D. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - Electromagnetic Study and Measurements of the iRCMS Cell J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - The ion Rapid Cycle Medical Synchrotron (iRCMS) * will provide proton and C ion bunches with maximum energy 270 MeV and 450 MeV/u respectively at a frequency of 15 Hz for treating cancerous tumors. One of the six cells of the iRCMS has been designed, built and magnetic field measurements have been performed. We will present results from the static and AC electromagnetic study of the iRCMS cell and compare the measured magnetic fields with those calculated using the OPERA computer code **. In addition the beam optics of the cell will be calculated based on the experimental fields using the zgoubi computer code *** and compared with the designed beam optics. PB - JACoW Publishing CP - Geneva, Switzerland SP - 403 EP - 405 KW - focusing KW - optics KW - quadrupole KW - proton KW - extraction DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-MOPGW123 UR - http://jacow.org/ipac2019/papers/mopgw123.pdf ER - TY - CONF AU - Carmignani, N. AU - De Nolf, W. AU - Franchi, A. AU - Nash, B. AU - Sahle, C. AU - Torino, L. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - Measurements of the Momentum Compaction Factor of the ESRF Storage Ring J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - In a storage ring, the momentum compaction factor can be obtained by measuring the variation of the beam energy as a function of the RF frequency. In this paper we present the measurement of the momentum compaction factor from two different methods. With the first, we measure the variation of the undulator spectra for different RF frequencies. With the second, we measure the variation of the hard x-rays flux produced by a dipole for different RF frequencies. PB - JACoW Publishing CP - Geneva, Switzerland SP - 1392 EP - 1395 KW - radiation KW - undulator KW - electron KW - SRF KW - synchrotron DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-TUPGW006 UR - http://jacow.org/ipac2019/papers/tupgw006.pdf ER - TY - CONF AU - Abell, D.T. AU - Beekman, I.B. AU - Moeller, P. AU - Méot, F. AU - Nagler, R. AU - Nash, B. AU - Pogorelov, I.V. AU - Rouson, D.W.I. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - Zgoubi Status: Improved Performance, Features, and Graphical Interface J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - The particle tracking code Zgoubi * has been used for a broad array of accelerator design studies, including FFAGs and EICs. Zgoubi is currently being used to evaluate the spin polarization performance of proposed designs for both JLEIC ** and eRHIC ***, and to prepare for commissioning the CBETA BNL-Cornell FFAG return loop ERL ****. We describe our on-going work on several fronts, including efforts to parallelize Zgoubi using new features of Fortran 2018 *****, and a new implementation of Zgoubi’s particle update algorithm. We also describe a new, web-based graphical interface for Zgoubi. PB - JACoW Publishing CP - Geneva, Switzerland SP - 3271 EP - 3274 KW - lattice KW - interface KW - closed-orbit KW - linac KW - pick-up DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-WEPTS062 UR - http://jacow.org/ipac2019/papers/wepts062.pdf ER - TY - CONF AU - Edelen, J.P. AU - Abell, D.T. AU - Bruhwiler, D.L. AU - Cook, N.M. AU - Hall, C.C. AU - Webb, S.D. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - A Novel S-Based Symplectic Algorithm for Tracking With Space Charge J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - Traditional finite-difference particle-in-cell methods for modeling self-consistent space charge introduce non-Hamiltonian effects that make long-term tracking in storage rings unreliable. Foremost of these is so-called grid heating. Particularly for studies where the Hamiltonian invariants are critical for understanding the beam dynamics, such as nonlinear integrable optics, these spurious effects make interpreting simulation results difficult. To remedy this, we present a novel symplectic spectral space charge algorithm that is free of non-Hamiltonian numerical effects and, therefore, suitable for long-term tracking studies. Results presented here include a detailed study of the solver’s performance under a range of conditions. First, we show benchmarking and convergence studies for different particle shapes and different particle distributions. Then we demonstrate the solver’s ability to preserve Hamiltonian structure by studying the formation of space-charge driven resonances using both our algorithm and traditional PIC. PB - JACoW Publishing CP - Geneva, Switzerland SP - 3279 EP - 3282 KW - space-charge KW - simulation KW - resonance KW - optics KW - proton DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-WEPTS068 UR - http://jacow.org/ipac2019/papers/wepts068.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 - Bruhwiler, D.L. AU - Abell, D.T. AU - Cook, N.M. AU - Hall, C.C. AU - Keilman, M.V. AU - Moeller, P. AU - Nagler, R. AU - Nash, B. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - Knowledge Exchange Within the Particle Accelerator Community via Cloud Computing J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - The development, testing and use of particle accelerator modeling codes is a core competency of accelerator research laboratories around the world, and likewise for synchrotron radiation and X-ray optics codes at lightsource facilities. Such codes require time and training to learn a command-line workflow involving multiple input and configuration files, execution on a high-performance server or cluster, post-processing with specialized software and finally visualization. Such workflows are error prone an difficult to reproduce. Cloud computing and UI design are core competencies of RadiaSoft LLC, where the Sirepo* framework is being developed to make state of the art codes available in the browser of any desktop, laptop or tablet. We present our initial successes as real world examples of knowledge exchange (KE) between industry and the research community. This work is leading to broader knowledge exchange throughout the community by facilitating education of students and enabling instantaneous sharing of simulation details between colleagues. Sirepo design objectives include: seamless integration with legacy codes, low barrier to entry for new users, configuration transfer to command line mode, catalog of provenance to aid reproducibility, and simplified collaboration through multimodal sharing. The Sirepo Scientific Gateway** allows users to directly test the software. The combination of intuitive browser-based GUIs and Sirepo’s server-side application container technology enables simplified computational archiving and reproducibility. If embraced by the community, this could become an important asset for the design, commissioning and future upgrade of particle accelerator and X-ray beamline facilities. PB - JACoW Publishing CP - Geneva, Switzerland SP - 3548 EP - 3551 KW - simulation KW - GUI KW - software KW - HOM KW - electron DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-THPMP046 UR - http://jacow.org/ipac2019/papers/thpmp046.pdf ER - TY - CONF AU - Edelen, J.P. AU - Cook, N.M. AU - Hall, C.C. AU - Hu, Y. AU - Vay, J.-L. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - Advanced Modeling and Optimization of Thermionic Energy Converters J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - Thermionic energy converters (TEC) are a class of thermoelectric devices, which promise improvements to the efficiency and cost of both small- and large-scale electricity generation. A TEC is comprised of a narrowly-separated thermionic emitter and an anode. Simple structures are often space-charge limited as operating temperatures produce currents exceeding the Child-Langmuir limit. We present results from 3D simulations of these devices using the particle-in-cell code Warp, developed at Lawrence Berkeley National Lab. We demonstrate improvements to the Warp code permitting high fidelity simulations of complex device geometries. These improvements include modeling of non-conformal geometries using mesh refinement and cut-cells with a dielectric solver, in addition to importing geometries directly from standard CAD output. In this paper we showcase some of these new features and demonstrate their use. PB - JACoW Publishing CP - Geneva, Switzerland SP - 3552 EP - 3554 KW - interface KW - simulation KW - cathode KW - framework KW - diagnostics DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-THPMP047 UR - http://jacow.org/ipac2019/papers/thpmp047.pdf ER - TY - CONF AU - Andonian, G. AU - Bruhwiler, D.L. AU - Campese, T.J. AU - Conde, M.E. AU - Cook, N.M. AU - Doran, D.S. AU - Ha, G. AU - O'Shea, F.H. AU - Power, J.G. AU - Rosenzweig, J.B. AU - Shao, J.H. AU - Wisniewski, E.E. AU - Xu, T. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - Status on a Laser Injection in Beam Driven Dielectric Wakefield Accelerator 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 generation of high-brightness beams with ultra-low emittance using the plasma photocathode technique has gained significant traction in recent years. The practical execution of a combined plasma wakefield acceleration section and a laser injected typically requires a dual gas medium for precision ionization of low and high ionization thresholds. The concept can be partially simplified in experiment by replacing the plasma wakefield acceleration component with a dielectric wakefield acceleration scheme, sacrificing field gradient but maintaining low emittance beam generation. In this paper, we describe the progress on the design of a hybrid scheme, using laser injection in a gas medium within a dielectric wakefield accelerator structure. The proof-of-concept experiment is planned to take place at the Argonne Wakefield Accelerator. PB - JACoW Publishing CP - Geneva, Switzerland SP - 3761 EP - 3763 KW - wakefield KW - experiment KW - plasma KW - laser KW - electron DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-THPGW073 UR - http://jacow.org/ipac2019/papers/thpgw073.pdf ER -