TY - CONF AU - Ma, Y. AU - Fong, K. AU - Keir, J.J. AU - Kishi, D. AU - Koscielniak, S.R. AU - Lang, D. AU - Laxdal, R.E. AU - Sekhon, R.S. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - Microphonics Suppression in ARIEL ACM1 Cryomodule J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - Now the stage of the 30MeV portion of ARIEL (The Advanced Rare Isotope Laboratory) e-Linac is under commissioning which includes an injector cryomodule (ICM) and the 1st accelerator cryomodule (ACM1) with two cavities configuration. The two ACM1 cavities are driven by a single klystron with vector-sum control and running in CW mode. During the commissioning, the ACM1 cavities gradient and stability was limited by ponderomotive effect. Acoustic noise from the environment vibration generated by cooling water system, cryogenic system and vacuum system have been identified to certain external source and some damping has been installed. In this paper, the progress of the microphonics suppression of ACM1 is presented. PB - JACoW Publishing CP - Geneva, Switzerland SP - 65 EP - 68 KW - cavity KW - GUI KW - cryomodule KW - linac KW - pick-up DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-MOPGW004 UR - http://jacow.org/ipac2019/papers/mopgw004.pdf ER - TY - CONF AU - Koscielniak, S.R. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - Space-Charge Potential for Elliptical Beams 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 is motivated by the weak-strong beam-beam effect as occurs in colliding charged-particle beams. We consider beams with elliptical cross section and power law binomial forms for the density distribution. We demonstrate explicitly how to construct analytically the space-charge potential inside the ’strong’ beam. This is essential to the program of calculating beam-beam effects for non-gaussian beams. PB - JACoW Publishing CP - Geneva, Switzerland SP - 69 EP - 71 KW - space-charge KW - beam-beam-effects KW - focusing KW - proton DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-MOPGW005 UR - http://jacow.org/ipac2019/papers/mopgw005.pdf ER - TY - CONF AU - Koscielniak, S.R. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - Long Range Beam Beam: Towards Faster Computations J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - We outline some features of a program of study toward faster computation of the cumulative effect of a sequence of beam-beam interactions across the interaction region. PB - JACoW Publishing CP - Geneva, Switzerland SP - 72 EP - 74 KW - optics KW - interaction-region KW - closed-orbit KW - lattice KW - betatron DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-MOPGW006 UR - http://jacow.org/ipac2019/papers/mopgw006.pdf ER - TY - CONF AU - Koscielniak, S.R. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - Electromagnetic Impulse of Beam Density F(x, y)G(z) J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - We calculate the transverse impulse on a test particle as a bunch of charged particles beam passes by. It is often assumed, but seldom proven, that the EM field from a beam density distribution factored into transverse and longitudinal parts, F and G respectively, has also a factored form P(x, y)Q(z). This factorization is not possible for stationary charges. Contrastingly, it becomes increasingly accurate for ultra-relativistic particle beams. We give a general analysis, show how to develop the corrections in terms of integrals of F and derivatives of G. What is significant is that if we integrate over longitudinal coordinate z to find the transverse impulse on a witness charge, the correction terms integrate to zero leading to the impulse P(x, y)Integral[Q(z)] independent of bunch shape. If this result is already known, this paper serves as a reminder. PB - JACoW Publishing CP - Geneva, Switzerland SP - 75 EP - 77 KW - factory KW - site KW - storage-ring KW - lattice KW - interaction-region DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-MOPGW007 UR - http://jacow.org/ipac2019/papers/mopgw007.pdf ER - TY - CONF AU - Nagimov, R.R. AU - Bylinskii, Y. AU - Egoriti, L. AU - Gottberg, A. AU - Hodgson, G.W. AU - Koveshnikov, A.N. AU - Yosifov, D. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - Development of Remote Handleable Axially Decoupled Radiation Resistant Vacuum Seal J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - Advanced Rare IsotopE Laboratory (ARIEL) facility is a major expansion of TRIUMF’s rare isotope research program. Aiming to triple the production of rare isotopes, ARIEL facility includes the new electron linac driver and two target stations for electron and proton beams. Particularities of ARIEL target stations design define the requirements for vacuum interfaces with both primary electron and proton beamlines and rare-isotope beamlines. None of the existing products fully met the requirements, driving the development of custom vacuum interfaces. The design of new vacuum seals is driven both by unique design specifications (limited amount of allowed axial forces, extreme radiation resistance, remote handleability and high repeatability) as well as limitations of the proposed design of beamline infrastructure in the target hall (limited available space and the choice of materials for certain components). This paper discusses preliminary results of the vacuum seal development and presents first results of prototype testing. PB - JACoW Publishing CP - Geneva, Switzerland SP - 1233 EP - 1235 KW - vacuum KW - target KW - interface KW - operation KW - electron DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-TUPMP003 UR - http://jacow.org/ipac2019/papers/tupmp003.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 - Fong, K. AU - Leewe, R. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - Parametric Pumped Oscillation by Lorentz Force in Superconducting Rf Cavity J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - Mechanical instabilities have been observed in superconducting RF cavities, when multiple cavities are driven by a single klystron and these cavities are regulated by vector-summing the outputs from these cavities. A nonlinear theory has been developed to study the source of this mechanical instability, which is due to the coupling between Lorentz force detuning and mechanical oscillation by parametric pumping. Analytical and numerical analysis of this model show regions of stability, limit cycles and instabilities. These results are in agreement with the observed oscillations by TRIUMF eLinac Acceleration Module. PB - JACoW Publishing CP - Geneva, Switzerland SP - 2798 EP - 2800 KW - cavity KW - feedback KW - controls KW - acceleration KW - klystron DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-WEPRB003 UR - http://jacow.org/ipac2019/papers/weprb003.pdf ER - TY - CONF AU - Fu, X.L. AU - Au, T. AU - Fong, K. AU - Zheng, Q. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - Sawtooth Generation and Regulation with a Single FPGA for TRIUMF’s ARIEL Prebuncher J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - TRIUMF’s ARIEL prebuncher is powered by a sawtooth waveform which is the combination of an 11.79MHz, a 23.57MHz and a 35.36MHz components. The generation, control and regulation of these three components are all incorporated digitally inside a single FPGA. This FPGA can be standalone or inserted inside a VXI module. Commands and controls of these components can be directly through Ethernet, or indirectly through register-base or message-base VXI addresses. PB - JACoW Publishing CP - Geneva, Switzerland SP - 2801 EP - 2803 KW - controls KW - LLRF KW - FPGA KW - cavity KW - pick-up DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-WEPRB004 UR - http://jacow.org/ipac2019/papers/weprb004.pdf ER - TY - CONF AU - Koscielniak, S.R. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - Long Range Beam-Beam Tune Shifts & Wire Compensation J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - The weak-strong model subjects the test particle in the weak beam to transverse impulses from the strong beam, resulting in betatron tune shifts. We give analytic formulae for small amplitude and asymptotic shifts for three cases: short-range, long-range, and wire compensation; and optimize the latter to minimize the non-linear tune spreads. PB - JACoW Publishing CP - Geneva, Switzerland SP - 3092 EP - 3095 KW - site KW - beam-beam-effects KW - closed-orbit KW - dipole KW - quadrupole DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-WEPTS005 UR - http://jacow.org/ipac2019/papers/wepts005.pdf ER - TY - CONF AU - Avreline, N.V. AU - Alexey, P.G. AU - Polozov, S.M. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - The Use of an RF Undulator in the Design of an Accelerating Structure J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - The idea of accelerating a beam in the accelerating structures based on an RF undulator poses great advantages in high current proton and ions accelerators. The accelerating structure based on an RF undulator uses a combinational wave that consists of the zeroth and the first harmonics for acceleration and focusing. This paper presents the development of this accelerating structure for acceleration of a beam. In particular, we show that this structure is an H-type resonator composed from five coupled sections. PB - JACoW Publishing CP - Geneva, Switzerland SP - 3587 EP - 3590 KW - proton KW - acceleration KW - focusing KW - undulator KW - simulation DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-THPGW004 UR - http://jacow.org/ipac2019/papers/thpgw004.pdf ER - TY - CONF AU - Avreline, N.V. AU - Bylinskii, Y. AU - Gregoire, D. AU - Jakovljevic, B. AU - Laxdal, R.E. AU - Wang, X. AU - Waraich, B.S. AU - Zvyagintsev, V. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - Recent Developments of the 520 MeV Cyclotron’s High-Power RF System at TRIUMF J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - 520 MeV Cyclotron’s High-Power RF System has been in the state of continuous operation for over 50 years since its commissioning. This paper describes the recent upgrades of the RF System, the main goal of which was to improve reliability. Specially, we discuss the upgrades done to the RF Transmission Line (TL), the RF Power Amplifier (PA) components and their diagnostics tools. We upgraded the structure of Intermediate Power Amplifier (IPA), installed Solid State (SS) driver and are in the process of replacing tubes with a SS option for IPA and PA. PB - JACoW Publishing CP - Geneva, Switzerland SP - 3591 EP - 3593 KW - cyclotron KW - operation KW - simulation KW - rf-amplifier KW - coupling DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-THPGW005 UR - http://jacow.org/ipac2019/papers/thpgw005.pdf ER - TY - CONF AU - Koscielniak, S.R. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - Ponderomotive Instability of Self-Excited Cavity J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - The electro-magnetic fields within a super-conducting radio frequency (SRF) cavity can be sufficiently strong to deform the cavity shape, which may lead to a ponderomotive instability. Stability criteria for the self-excited mode of cavity operation were given in 1978 by Delayen. The treatment was based on the Routh-Hurwitz analysis of the characteristic polynomial. With the Wolfram modern analytical tool, "Mathematica", we revisit the criteria for an SRF cavity equipped with amplitude and phase loops and a single microphonic mechanical mode. PB - JACoW Publishing CP - Geneva, Switzerland SP - 3808 EP - 3811 KW - cavity KW - resonance KW - feedback KW - SRF KW - controls DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-THPRB007 UR - http://jacow.org/ipac2019/papers/thprb007.pdf ER - TY - CONF AU - Koscielniak, S.R. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - Ponderomotive Instability of Two Self-Excited Cavities J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - We consider the ponderomotive instability of two superconducting RF cavities self-driven from a single RF source with vector-sum control. PB - JACoW Publishing CP - Geneva, Switzerland SP - 3812 EP - 3815 KW - cavity KW - resonance KW - controls KW - linac KW - coupling DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-THPRB008 UR - http://jacow.org/ipac2019/papers/thprb008.pdf ER - TY - CONF AU - Koscielniak, S.R. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - Vector Sum & Diffference Control of SRF Cavities J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - We consider the ponderomotive instability of multiple superconducting RF cavities driven from a single RF source. We add vector difference control to the usual the technique of vector sum control, in order to increase the accelerating gradient threshold for ponderomotive instability. PB - JACoW Publishing CP - Geneva, Switzerland SP - 3816 EP - 3819 KW - cavity KW - controls KW - resonance KW - coupling KW - linac DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-THPRB009 UR - http://jacow.org/ipac2019/papers/thprb009.pdf ER - TY - CONF AU - Koscielniak, S.R. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - Ponderomotive Instability of Generator-Driven Cavity J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - The electro-magnetic fields within a super-conducting radio frequency (SRF) cavity can be sufficiently strong to deform the cavity shape, which may lead to a ponderomotive instability. Stability criteria for the generator-driven mode of cavity operation were given in 1971 by Schulze. The treatment side-stepped the Routh-Hurwitz analysis of the characteristic polynomial. With the Wolfram modern analytical tool, ’Mathematica’, we revisit the criteria for an SRF cavity equipped with amplitude and phase loops and a single microphonic mechanical mode. PB - JACoW Publishing CP - Geneva, Switzerland SP - 3820 EP - 3823 KW - cavity KW - resonance KW - controls KW - SRF KW - feedback DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-THPRB010 UR - http://jacow.org/ipac2019/papers/thprb010.pdf ER - TY - CONF AU - Shahriari, Z. AU - Dumont, G.A. AU - Fong, K. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - Norm-optimal Iterative Learning Control to Cancel Beam Loading Effect on the Accelerating Field J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - Iterative learning control (ILC) is an open loop control strategy that improves the performance of a repetitive system through learning from previous iterations. ILC can be used to compensate for a repetitive disturbance like the beam loading effect in resonators. In this work, we aim to use norm-optimal ILC to cancel beam loading effect. Norm-optimal ILC updates the control signal with the goal of minimizing a performance index, which results in monotonic convergence. Simulation results show that this controller improves beam loading compensation compared to a PI controller. PB - JACoW Publishing CP - Geneva, Switzerland SP - 3824 EP - 3826 KW - controls KW - beam-loading KW - cavity KW - simulation KW - feedback DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-THPRB011 UR - http://jacow.org/ipac2019/papers/thprb011.pdf ER - TY - CONF AU - Shelbaya, O. AU - Baartman, R.A. AU - Kester, O.K. AU - Kiy, S. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - Toward Autonomous Phasing of ISAC Heavy Ion LINACs J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - Ongoing development work at TRIUMF aims to implement a model-based tuning approach for accelerators, with the goal of automation of tuning tasks and minimizing tuning times. As a part of this, work is underway toward the development of an analytical model of the linacs using the methodology of Hamiltonian based beam envelope dynamics. The TRIUMF High-Level Applications (HLA) project has been developing software that allows direct interfacing with the control system. The envelope code TRANSOPTR is now being extended to simulate the ISAC-II Superconducting Linac. Within the emerging HLA framework, this will allow for automated phasing and tuning of the linac. The steps of the model development will be presented in this contribution. PB - JACoW Publishing CP - Geneva, Switzerland SP - 3827 EP - 3830 KW - cavity KW - ISAC KW - linac KW - controls KW - cryomodule DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-THPRB012 UR - http://jacow.org/ipac2019/papers/thprb012.pdf ER -