IPAC2021 - List of Keywords (betatron)

Paper	Title	Other Keywords	Page
MOPAB002	Risk of Halo-Induced Magnet Quenches in the HL-LHC Beam Dump Insertion	proton, insertion, collimation, operation	41
	J.B. Potoine, A. Apollonio, E. Belli, C. Bracco, R. Bruce, M. D’Andrea, R. García Alía, A. Lechner, G. Lerner, S. Morales Vigo, S. Redaelli, V. Rizzoglio, E. Skordis, A. Waets CERN, Meyrin, Switzerland F. Wrobel IES, Montpellier, France
	Funding: Research supported by the HL-LHC project After the High Luminosity (HL-LHC) upgrade, the LHC will be exposed to a higher risk of magnet quenches during periods of short beam lifetime. Collimators in the extraction region (IR6) assure the protection of magnets against asynchronous beam dumps, but they also intercept a fraction of the beam halo leaking from the betatron cleaning insertion. In this paper, we assess the risk of quenching nearby quadrupoles during beam lifetime drops. In particular, we present an empirical analysis of halo losses in IR6 using LHC Run 2 (2015-2018) beam loss monitor measurements. Based on these results, the halo-induced power density in magnet coils expected in HL-LHC is estimated using FLUKA Monte Carlo shower simulations.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-MOPAB002
About •	paper received ※ 19 May 2021 paper accepted ※ 13 July 2021 issue date ※ 22 August 2021
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MOPAB017	Influence of Injection Kicker Post-pulses on Storage of Ion Stack in NICA Collider	kicker, electron, injection, collider	93
	E. Syresin, A. Tuzikov, N.O. Zagibin JINR, Dubna, Moscow Region, Russia
	The peculiarity of the injection kicker power supply in NICA collider is related to same post pulse of the magnetic field which is appeared after a regular injection pulse. The magnetic field of this post pulse became to an increase of the stack ion angle spread during each injection cycle. When the stack ion angles reaches the acceptance angle the ions are lost in the collider. Influence of the injection kicker post pulse on the storage of the ion stack is considered in this paper in presence of the electron cooling and ion electron recombination losses.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-MOPAB017
About •	paper received ※ 17 May 2021 paper accepted ※ 20 May 2021 issue date ※ 13 August 2021
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MOPAB041	Convergence Map with Action-Angle Variables Based on Square Matrix for Nonlinear Lattice Optimization	lattice, linear-dynamics, resonance, GUI	182
	L.H. Yu, Y. Hidaka, F. Plassard, V.V. Smaluk BNL, Upton, New York, USA Y. Hao FRIB, East Lansing, Michigan, USA
	We apply square matrix method to obtain in high speed a "convergence map", which is similar but different from frequency map. The convergence map is obtained from solving nonlinear dynamical equation by iteration of perturbation method and study the convergence. The map provides information about the stability border of dynamical aperture. We compare the map with frequency map from tracking. The result indicates the new method may be applied in nonlinear lattice optimization, taking the advantage of the high speed (about 10~50 times faster) to explore x, y and the off-momentum phase space.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-MOPAB041
About •	paper received ※ 09 May 2021 paper accepted ※ 26 May 2021 issue date ※ 18 August 2021
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MOPAB134	Normalized Transverse Emittance Reduction via Ionization Cooling in MICE ’Flip Mode’	emittance, simulation, solenoid, experiment	474
	P.B. Jurj Imperial College of Science and Technology, Department of Physics, London, United Kingdom
	Low emittance muon beams are central to the development of a Muon Collider and can significantly enhance the performance of a Neutrino Factory. The international Muon Ionization Cooling Experiment (MICE) has recorded several million individual muon tracks passing through a liquid hydrogen or a lithium hydride absorber and has demonstrated the ionization cooling of muon beams. Previous analysis used a restricted data set, and the beam matching was not perfect. In this analysis, beam sampling routines were employed to account for imperfections in beam matching at the entrance into the cooling channel and enable an improvement of the cooling measurement. A study of the normalized transverse emittance change in the MICE cooling channel set up in a flipped polarity magnetic field configuration is presented. Additionally, the evolution of the canonical angular momentum across the absorber is shown and the characteristics of the cooling effect are discussed.
	Poster MOPAB134 [1.821 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-MOPAB134
About •	paper received ※ 19 May 2021 paper accepted ※ 09 June 2021 issue date ※ 27 August 2021
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MOPAB148	Liénard-Wiechert Numerical Radiation Modeling for Plasma Acceleration Experiments at FACET-II	radiation, plasma, acceleration, experiment	517
	M. Yadav, G. Andonian, C.E. Hansel, N. Majernik, P. Manwani, B. Naranjo, J.B. Rosenzweig, O. Williams, Y. Zhuang UCLA, Los Angeles, California, USA G. Andonian RadiaBeam, Marina del Rey, California, USA O. Apsimon, A. Perera, C.P. Welsch The University of Liverpool, Liverpool, United Kingdom O. Apsimon, A. Perera, C.P. Welsch Cockcroft Institute, Warrington, Cheshire, United Kingdom
	Funding: This work was supported by DE-SC0009914 (UCLA) and the STFC Liverpool Centre for Doctoral Training on Data Intensive Science (LIV. DAT) under grant agreement ST/P006752/1. Future plasma acceleration experiments at FACET-II will measure betatron radiation in order to provide single-shot non-destructive beam diagnostics. We discuss three models for betatron radiation: a new idealized particle tracking code with Liénard-Wiechert radiation, a Quasi-Static Particle-in-Cell (PIC) code with Liénard-Wiechert radiation, and a full PIC code with radiation computed via a Monte-Carlo QED Method. Predictions of the three models for the E-310 experiment are presented and compared. Finally, we discuss beam parameter reconstruction from the double differential radiation spectrum.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-MOPAB148
About •	paper received ※ 24 May 2021 paper accepted ※ 01 June 2021 issue date ※ 17 August 2021
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MOPAB178	Systematic Effects Limiting the Sensitivity of "Magic Energy" Proton EDM Rings	proton, dipole, pick-up, focusing	602
	C. Carli, M. Haj Tahar CERN, Geneva, Switzerland
	Proposals to measure a possible Electric Dipole Moment (EDM) of protons in an electro-static storage ring are studied by a world-wide community. The machine is operated at the so-called "magic energy" to satisfy the "frozen spin" condition such that, without imperfections and with the well known magnetic moment of the particle, the spin is always oriented parallel to the direction of movement. The effect of a finite EDM is a build-up of a vertical spin component. Any effect, other than a finite EDM, leading as well to a build-up of a vertical spin limits the sensitivity of the experiment. Such "systematic effects" are caused by machine imperfections, such as magnetic fields inside the magnetic shield surrounding the ring, and misalignments of electro-static elements or of the RF cavity. Operation of the machine with counter-rotating beams helps mitigating some of the effects. The most dangerous effects are those, which cannot be disentangled from an EDM by combining measurements from both counter-rotating beams, such as an average residual radial magnetic field penetrating the magnetic shield or a combination of magnetic fields and misalignments of electric elements.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-MOPAB178
About •	paper received ※ 18 May 2021 paper accepted ※ 17 June 2021 issue date ※ 20 August 2021
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MOPAB213	Characterization of Linear Optics and Beam Parameters for the APS Booster with Turn-by-Turn BPM Data	booster, synchrotron, optics, kicker	703
	X. Huang, H. Shang, C. Yao ANL, Lemont, Illinois, USA
	We take turn-by-turn (TBT) BPM data on the energy ramp of the APS Booster, and analyze the data with the independent component analysis. The extraction kicker was used to excite the betatron motion. The linear optics of the machine is characterized with the TBT BPM data. We also analyze the decoherence pattern of the kicked beam, from which we are able to derive beam distribution parameters, such as the momentum spread.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-MOPAB213
About •	paper received ※ 13 May 2021 paper accepted ※ 11 June 2021 issue date ※ 19 August 2021
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MOPAB214	Linear Optics Measurement for the APS Ring with Turn-by-Turn BPM Data	optics, quadrupole, lattice, storage-ring	707
	X. Huang, V. Sajaev, Y.P. Sun, A. Xiao ANL, Lemont, Illinois, USA
	We measure the linear optics of the APS storage ring from turn-by-turn BPM data taken when the beam is excited with an injection kicker. Decoherence due to chromaticity and amplitude-dependent detuning is observed and compared to theoretic predictions. Independent component analysis is used to analyze the data, which separates the betatron normal modes and synchrotron motion, despite contamination of bad BPMs. The beta functions and phase advances are subsequently obtained. The method is used to study the linear optics perturbation of an insertion device.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-MOPAB214
About •	paper received ※ 12 May 2021 paper accepted ※ 09 June 2021 issue date ※ 01 September 2021
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MOPAB226	Analytical Description of the Steerer Parameters in the Bilinear-Exponential Model at DELTA	storage-ring, closed-orbit, coupling, simulation	737
	S. Kötter DELTA, Dortmund, Germany
	At DELTA, a 1.5 GeV synchrotron radiation source operated by the TU Dortmund University, an analytical description of the steerer parameters in the bilinear-exponential (BE) model has been developed. The BE model describes the coupled orbit response in a storage ring. It is used in the closed-orbit bilinear-exponential analysis (COBEA) algorithm to decompose orbit response matrices into beta function, betatron phase, and a scaled dispersion. After introducing the BE model and the analytical steerer parameters, a simulation-based comparison of the BE model and another coupled orbit response model is presented.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-MOPAB226
About •	paper received ※ 19 May 2021 paper accepted ※ 08 June 2021 issue date ※ 11 August 2021
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MOPAB235	Transverse 2d Phase-Space Tomography Using Beam Position Monitor Data of Kicked Beams	emittance, optics, electron, storage-ring	763
	K. Hwang, C.E. Mitchell, R.D. Ryne LBNL, Berkeley, California, USA
	Funding: U.S. Department of Energy under Contract No. DE-AC02-05CH11231 The time-series Beam Position Monitor (BPM) data of kicked beam is a function of lattice parameters and beam parameters including phase-space density. The decoherence model using the first-order detuning parameter has an exact solution when the beam is Gaussian. We parameterize the beam phase-space density by multiple Gaussian kernels of different weights, means, and sizes to formulate the inverse problem for 2D phase-space tomography. Numerical optimization and Bayesian inference are used to infer the beam density.
	Poster MOPAB235 [1.253 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-MOPAB235
About •	paper received ※ 20 May 2021 paper accepted ※ 02 June 2021 issue date ※ 01 September 2021
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MOPAB248	Injection Schemes for the SOLEIL Upgrade	injection, storage-ring, lattice, synchrotron	796
	M.-A. Tordeux, P. Alexandre, R. Ben El Fekih, P. Brunelle, L. Hoummi, A. Loulergue, L.S. Nadolski, R. Nagaoka SOLEIL, Gif-sur-Yvette, France
	Injection into the SOLEIL upgrade storage ring is much more challenging compared to the case of the current ring. Thanks to the experience gained in the development, manufacture and commissioning of a Multipole Injection Kicker (MIK) on the MAX IV 3 GeV storage ring, the SOLEIL pulsed magnet team is currently developing new MIK magnets that will serve as the basis for the injection schemes in the upgrade storage ring. We then propose two kinds of injections: firstly, a betatron off-axis injection that should be compatible with the full-coupling storage ring tuning, and secondly, a synchrotron on-axis injection by creating a large horizontal dispersion bump at the injection point.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-MOPAB248
About •	paper received ※ 19 May 2021 paper accepted ※ 21 May 2021 issue date ※ 26 August 2021
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MOPAB273	Nonlinear Coupling Resonances in X-Y Coupled Betatron Oscillations Near the Main Coupling Resonance in VEPP-2000 Collider	resonance, coupling, collider, experiment	863
	S.A. Kladov, E. Perevedentsev BINP SB RAS, Novosibirsk, Russia S.A. Kladov, E. Perevedentsev NSU, Novosibirsk, Russia
	In the vicinity of the linear coupling resonance where the working point of the collider is positioned, we study the effect of nonlinear coupling resonances on the single-particle phase space, beam sizes and the waveform of coherent beam motion. The latter is interesting for diagnostics of the nonlinear dynamics.
	Poster MOPAB273 [1.142 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-MOPAB273
About •	paper received ※ 19 May 2021 paper accepted ※ 28 May 2021 issue date ※ 21 August 2021
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MOPAB274	Two-Stream Effects in Coherent Beam-Beam Oscillations in VEPP-2000 Collider Near the Linear Coupling Resonance	coupling, collider, synchrotron, resonance	866
	S.A. Kladov, E. Perevedentsev BINP SB RAS, Novosibirsk, Russia S.A. Kladov, E. Perevedentsev NSU, Novosibirsk, Russia
	Synchro-betatron motion of colliding bunches may cause limitations of the high-luminosity performance. For a round beam collider operated near the linear coupling resonance, we present theoretical predictions of the beam-beam coherent synchro-betatron oscillation behavior under the influence of x-y coupling.
	Poster MOPAB274 [0.968 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-MOPAB274
About •	paper received ※ 19 May 2021 paper accepted ※ 02 June 2021 issue date ※ 02 September 2021
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MOPAB319	Development of a Fast Betatron Tune and Chromaticity Measurement System for COSY	acceleration, GUI, controls, resonance	983
	P.J. Niedermayer, C. Böhme, B. Breitkreutz, V. Kamerdzhiev, A. Lehrach FZJ, Jülich, Germany A. Lehrach RWTH, Aachen, Germany
	A fast tune measurement is developed for the Cooler Synchrotron COSY at the Institut für Kernphysik of Forschungszentrum Jülich. Betatron oscillations of the beam are excited with a band-limited RF signal via a stripline kicker. Resonant transverse oscillations are then observed using capacitive beam position monitors. Based on the bunch-by-bunch beam position data the betatron tune is determined. The usage of bunch-by-bunch data is characteristic of the new system. It allows for a discrete tune measurement within a few milliseconds, as well as continuous tune monitoring during beam acceleration. The high precision tune measurement also enables determination of the beam chromaticity. Therefore, the beam momentum is varied by means of the RF frequency and the subsequent tune change is determined. For routine use during beam operation and experiments, the developed method is integrated into the control system.
	Poster MOPAB319 [1.209 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-MOPAB319
About •	paper received ※ 19 May 2021 paper accepted ※ 16 June 2021 issue date ※ 12 August 2021
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MOPAB349	New Accelerator Beam Centerline (ABC) Production Line at Varex Imaging Corporation	linac, gun, detector, GUI	1087
	A.V. Mishin Varex Imaging, Salt Lake City, USA
	In January 2017, a Salt Lake City Component Division of Varian Medical (Varian), producer of X-ray tubes, detectors, and imaging panels has been spun off, giving birth to a new public company Varex Imaging Corporation (Varex), which also includes the Security and Inspection Products (SIP) linac producer in Las Vegas. Based on Varian asset acquisition of two small LLCs** in May 2016, 8 months prior to the transition, a new business branch within Varex has been established, which included distribution of the betatrons and detector arrays as well as pilot production line for Accelerator Beam Centerlines (ABC). In 3 years, we moved ABC production from Fremont, CA to Salt Lake in Utah and improved it; several ABCs have been designed, produced, and qualified. A number of new products in energy range of 1-20 MeV are under development, based on the new ABCs used as components for SIP linear accelerator systems and ABCs sold to third parties for applications other than Security and NDT. The new products will brag broad energy and dose rate regulation, smooth and reliable operation, providing extended benefits to our customers. * - https://www.varian.com/ - https://www.vareximaging.com/ * - both Thought One LLC and Radmedex LLC have been dissolved in 2018 upon completion of the transition process
	Poster MOPAB349 [2.182 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-MOPAB349
About •	paper received ※ 13 May 2021 paper accepted ※ 27 May 2021 issue date ※ 21 August 2021
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TUPAB059	Measurement of the Advanced Photon Source Lifetime at Different Level of Beta-Beating	quadrupole, storage-ring, optics, simulation	1496
	Y.P. Sun ANL, Lemont, Illinois, USA
	Funding: The work is supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02-06CH11357. Linear optics correction of a particle accelerator may not be perfect due to the existence of different errors sources in response matrix measurements and optics correction process. Previous numerical simulation study has shown that the single particle beam dynamics performance may be highly correlated with the level of residual beta-beating. In this paper, the machine study results on beam lifetime of the APS storage ring is presented. The experiment is performed at different level of predefined beta-beating with negligible betatron tunes variations. As expected, the measured beam lifetime has an inverse correlation with the level of beta-beating.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-TUPAB059
About •	paper received ※ 19 May 2021 paper accepted ※ 17 June 2021 issue date ※ 16 August 2021
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TUPAB083	Dual Energies in the LCLS Copper Linac	linac, quadrupole, feedback, klystron	1570
	F.-J. Decker, C. Bianchini Mattison, D.K. Bohler, A. Brachmann, W.S. Colocho, S. Condamoor, M.L. Gibbs, K.H. Kim, A.A. Lutman, T.J. Maxwell, J.A. Mock, H.-D. Nuhn, J.C. Sheppard, H. Smith, T.J. Smith, M. Stanek, S. Zelazny, Z. Zhang, C.M. Zimmer SLAC, Menlo Park, California, USA
	For LCLS-II two undulators were installed at SLAC, one for soft and one for hard x-rays. Before the superconducting linac gets turned on the copper linac is providing beams at 120 Hz to these two beam destinations. The 120 Hz can be split in many different ratios between soft and hard via a pulsed magnet. To get an optimized beam for the quite different photon energies the pulsed linac components like modulators and RF can provide many different beam parameters, mainly energies and bunch lengths for the two undulator lines. How this was implemented with timing setups of triggers and finally after the split the necessary matching of the transverse phase space will be discussed.
	Poster TUPAB083 [0.479 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-TUPAB083
About •	paper received ※ 19 May 2021 paper accepted ※ 27 May 2021 issue date ※ 21 August 2021
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TUPAB192	Studies on Momentum Collimation for CSNS-RCS Upgrades	collimation, bunching, space-charge, emittance	1855
	Y.W. An, J. Chen, S.Y. Xu, Y. Yuan IHEP, Beijing, People’s Republic of China X.H. Lu, J.B. Yu IHEP CSNS, Guangdong Province, People’s Republic of China
	The CSNS project was a high intensity pulsed facility, and achieved the the design goal of 100kW in 2020. The upgrades of the CSNS are proposed, and the momentum collimator is a component of the upgrades. This paper will show the design scheme of the momentum collimator and the simulation results are also presented.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-TUPAB192
About •	paper received ※ 18 May 2021 paper accepted ※ 15 June 2021 issue date ※ 28 August 2021
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TUPAB219	Equilibrium and Nonlinear Beam Dynamics Parameters From Sirius Turn-by-Turn BPM Data	experiment, emittance, optics, factory	1935
	X.R. Resende, M.B. Alves, L. Liu, F.H. de Sá LNLS, Campinas, Brazil
	A considerable amount of beam information is conveyed by Turn-by-Turn (TbT) data of Beam Position Monitors (BPM). In this work such data sets are analyzed for Sirius, the Brazilian 4th Generation 3GeV synchrotron light source. In particular, equilibrium and non-linear beam dynamics parameters determining decoherence patterns in TbT position data are estimated and compared with corresponding values of the nominal storage ring model.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-TUPAB219
About •	paper received ※ 20 May 2021 paper accepted ※ 23 June 2021 issue date ※ 15 August 2021
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TUPAB223	Design of Double- and Multi-Bend Achromat Lattices with Large Dynamic Aperture and Approximate Invariants	lattice, sextupole, storage-ring, resonance	1945
	Y. Li, R.S. Rainer, V.V. Smaluk BNL, Upton, New York, USA K. Hwang, C.E. Mitchell, R.D. Ryne LBNL, Berkeley, California, USA
	Funding: Funded by U.S. Department of Energy (DOE) under Contract No. DE-SC0012704 (BNL) and DE-AC02-05CH11231 (LBNL), U.S. DOE Early Career Research Program under the Office of High Energy Physics. A numerical method to design nonlinear double- and multi-bend achromat (DBA and MBA) lattices with approximate invariants of motion is described. The search for such nonlinear lattices is motivated by Fermilab’s Integrable Optics Test Accelerator (IOTA), whose design is based on an integrable Hamiltonian system with two invariants of motion. While it may not be possible to design an achromatic lattice for a dedicated synchrotron light source storage ring with one or more exact invariants of motion, it is possible to tune the sextupoles and octupoles in existing DBA and MBA lattices to produce approximate invariants. In our procedure, the lattice is tuned while minimizing the turn-by-turn fluctuations of the Courant-Snyder actions Jx and Jy at several distinct amplitudes, while simultaneously minimizing diffusion of the on-energy betatron tunes. The resulting lattices share some important features with integrable ones, such as a large dynamic aperture, trajectories confined to invariant tori, robustness to resonances and errors, and a large amplitude-dependent tune-spread.
	Poster TUPAB223 [2.392 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-TUPAB223
About •	paper received ※ 10 May 2021 paper accepted ※ 15 June 2021 issue date ※ 20 August 2021
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TUPAB240	The Impact of Trajectory-Shaped Coil on the Beam Dynamics in the SC230 Superconducting Cyclotron	cyclotron, proton, extraction, induction	2002
	I.D. Lyapin, O. Karamyshev, V. Malinin, D. Popov JINR/DLNP, Dubna, Moscow region, Russia G.A. Karamysheva JINR, Dubna, Moscow Region, Russia
	In this paper, we compared the effect of the cyclotron coil shape on the beam dynamics. Two models were created. The first has a conventional round coil, the second has a coil that follows the trajectory of the protons. Parameters of extracted beams are discussed.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-TUPAB240
About •	paper received ※ 19 May 2021 paper accepted ※ 27 May 2021 issue date ※ 21 August 2021
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TUPAB311	Nonlinear Correctors Tuning for the Collector Ring Isochronous Mode	sextupole, optics, controls, proton	2218
	M.A. Lyalin, I. Koop, D.B. Shwartz BINP SB RAS, Novosibirsk, Russia I. Koop, M.A. Lyalin, D.B. Shwartz NSU, Novosibirsk, Russia
	One of the operating modes for the Collector Ring (CR) under construction in Darmstadt is the isochronous mode, in which the captured ions circulate with an equal period regardless of their momentum. The measurement of the orbital period T by the time-of-flight sensors makes it possible to precisely determine the mass to the charge ratio of the ion under study. For this, the change of the circulation period dT should not exceed 1·10^-6 for dT/T in the entire momentum acceptance of the 0.62%. Modeling in the Strategic Accelerator Design code showed that without nonlinear effects compensation, the orbital period variation is 1·10^-5. In this work, the parameters of nonlinear correctors, which are sextupoles and octupoles in CR, are determined, necessary for the isochronous mode implementation.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-TUPAB311
About •	paper received ※ 29 May 2021 paper accepted ※ 16 June 2021 issue date ※ 14 August 2021
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WEPAB009	Study of Harmonic Crab Cavity in EIC Beam-Beam Simulations	cavity, simulation, resonance, electron	2595
	D. Xu, Y. Hao FRIB, East Lansing, Michigan, USA Y. Luo, C. Montag BNL, Upton, New York, USA J. Qiang LBNL, Berkeley, California, USA
	In the Electron-Ion Collider (EIC) design, crab cavities are adopted to compensate the geometric luminosity loss from the crossing angle. From previous studies, higher-order synchro-betatron resonances are excited since the hadron beam is long and the crossing angle is large. To reduce the luminosity degradation rate, different combinations of harmonic crab cavities are studied with both weak-strong and strong-strong simulation methods. The frequency map analysis (FMA) is also used for comparison. This study helps determine the crab cavity parameters for the future EIC.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-WEPAB009
About •	paper received ※ 17 May 2021 paper accepted ※ 23 June 2021 issue date ※ 28 August 2021
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WEPAB010	Full Range Tune Scan Studies Using Graphics Processing Units with CUDA in EIC Beam-Beam Simulations	simulation, resonance, GPU, cavity	2598
	D. Xu, Y. Hao FRIB, East Lansing, Michigan, USA Y. Luo, C. Montag BNL, Upton, New York, USA J. Qiang LBNL, Berkeley, California, USA
	The hadron beam in the Electron-Ion Collider (EIC) suffers high order betatron and synchro-betatron resonances. In this paper, we present a weak-strong full range (0.0~0.5) fractional tune scan with a step size as small as 0.001. Multiple Graphics Processing Units (GPUs) are used to speed up the simulation. A code parallelized with MPI and CUDA is implemented. The good tune region from weak-strong scan is further checked by the self-consistent strong-strong simulation. This study provides beam dynamics guidance in choosing proper working points for the future EIC.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-WEPAB010
About •	paper received ※ 17 May 2021 paper accepted ※ 23 June 2021 issue date ※ 12 August 2021
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WEPAB302	COSY Machine-Model Optimization	dipole, operation, simulation, optics	3375
	I. Bekman, J.H. Hetzel FZJ, Jülich, Germany
	Funding: Helmholtz Association Successful operation of a particle accelerator requires accompanying model calculations. The model helps in understanding the machine and predicts the impact of a change in the settings (e.g. current of magnetic elements). For the COoler SYnchrotron (COSY) at Research Center Jülich the accelerator simulation software MAD-X is used to model the machine. The model parameters are steadily being improved based on various manual adjustments and analytical studies, however are hardly optimized all at once. This can be improved with machine learning methods. The model is used to predict measurable quantities, like Orbit Response Matrix (ORM) or betatron tunes. Several observables for different particle energies have been measured recently and the corresponding machine settings are available. We describe the effort to improve the agreement between measured and calculated ORMs and hence improve the agreement between model and (real) machine and report on the optimization using a multivariate algorithm (e.g. genetic algorithm). This facilitates the setup of COSY and will allow to perform high precision experiments e.g. a measurement of an electric dipole moment of deuterons at COSY.
	Poster WEPAB302 [1.905 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-WEPAB302
About •	paper received ※ 14 May 2021 paper accepted ※ 28 July 2021 issue date ※ 20 August 2021
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THXA07	Driven 3D Beam Oscillations for Optics Measurements in Synchrotrons	optics, dipole, synchrotron, emittance	3704
	L. Malina, J.M. Coello de Portugal, H. Timko, R. Tomás García CERN, Geneva, Switzerland
	Optics measurements in storage rings employ turn-by-turn data of transversely excited beams. Traditionally, to measure chromatic properties, the relative momentum is changed step-wise, which is time-consuming and almost impractical during the energy ramp. We present an optics measurement method based on adiabatic simultaneous 3-dimensional beam excitation, which is more time-efficient and well fitted for the energy ramp. This method was successfully demonstrated in the LHC utilising AC-dipoles in combination either with a slow RF-frequency modulation or a driven RF-phase modulation close to the synchrotron frequency. Faster longitudinal oscillations improve the accuracy of optics parameters inferred from the synchro-betatron sidebands. This paper reports on the experimental demonstration of optics measurements based on 3D driven beam excitations and the plans for LHC Run 3.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-THXA07
About •	paper received ※ 19 May 2021 paper accepted ※ 02 August 2021 issue date ※ 11 August 2021
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THPAB028	Beam-Beam Related Design Parameter Optimization for the Electron-Ion Collider	proton, electron, simulation, luminosity	3808
	Y. Luo, J.S. Berg, M. Blaskiewicz, W. Fischer, X. Gu, H. Lovelace III, C. Montag, R.B. Palmer, S. Peggs, V. Ptitsyn, F.J. Willeke BNL, Upton, New York, USA Y. Hao, D. Xu FRIB, East Lansing, Michigan, USA H. Huang ODU, Norfolk, Virginia, USA E.A. Nissen, T. Satogata JLab, Newport News, Virginia, USA J. Qiang LBNL, Berkeley, California, USA
	Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy. The design luminosity goal for the Electron-Ion Collider (EIC) is 1e34 cm^-2s⁻¹. To achieve such a high luminosity, the EIC design adopts high bunch intensities, flat beams at the interaction point (IP) with a small vertical β^*-function, and a high collision frequency, together with crab cavities to compensate the geometrical luminosity loss due to the large crossing angle of 25mrad. In this article, we present our strategies and approaches to obtain the design luminosity by optimizing some key beam-beam related design parameters. Through our extensive strong-strong and weak-strong beam-beam simulations, we found that beam flatness, electron and proton beam size matching at the IP, electron and proton working points, and synchro-betatron resonances arising from the crossing angle collision play a crucial role in proton beam size growth and luminosity degradation. After optimizing those parameters, we found a set of beam-beam related design parameters to reach the design luminosity with an acceptable beam-beam performance.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-THPAB028
About •	paper received ※ 17 May 2021 paper accepted ※ 28 July 2021 issue date ※ 25 August 2021
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THPAB174	T-BMT Spin Resonance Tracker Code for He3 with Six Snakes	resonance, polarization, emittance, HOM	4101
	V.H. Ranjbar, H. Huang, Y. Luo, F. Méot, V. Ptitsyn BNL, Upton, New York, USA G.H. Hoffstaetter, D. Sagan Cornell University (CLASSE), Cornell Laboratory for Accelerator-Based Sciences and Education, Ithaca, New York, USA F. Lin, V.S. Morozov JLab, Newport News, Virginia, USA
	Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy . Polarization lifetime for He3 using two and six snakes are studied using the T-BMT Spin Resonance Tracker code. This code integrates a reduced spinor form of the T-BMT equation including only several spin resonances and the kinematics of synchrotron motion. It was previously benchmarked against RHIC polarization lifetime under the two snake system . Phys. Rev.Accel. Beams 22 (2019) 9, 091001
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-THPAB174
About •	paper received ※ 20 May 2021 paper accepted ※ 02 July 2021 issue date ※ 28 August 2021
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THPAB189	New Techniques to Compute the Linear Tune	collider, simulation, damping, experiment	4142
	G. Russo, M. Giovannozzi CERN, Geneva, Switzerland G. Franchetti GSI, Darmstadt, Germany
	Tune determination in numerical simulations is an essential aspect of nonlinear beam dynamics studies. In particular, because it allows probing whether an initial condition is close to resonance, and it enables assessment of the stability of the orbit, i.e. whether the motion is regular or chaotic. In this paper, results of recently developed techniques to obtain accurate tune computation from numerical simulation data are presented and discussed in detail.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-THPAB189
About •	paper received ※ 18 May 2021 paper accepted ※ 26 July 2021 issue date ※ 19 August 2021
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Paper

Title

Other Keywords

Page

MOPAB002

Risk of Halo-Induced Magnet Quenches in the HL-LHC Beam Dump Insertion

proton, insertion, collimation, operation

41

J.B. Potoine, A. Apollonio, E. Belli, C. Bracco, R. Bruce, M. D’Andrea, R. García Alía, A. Lechner, G. Lerner, S. Morales Vigo, S. Redaelli, V. Rizzoglio, E. Skordis, A. Waets
CERN, Meyrin, Switzerland
F. Wrobel
IES, Montpellier, France

Funding: Research supported by the HL-LHC project
After the High Luminosity (HL-LHC) upgrade, the LHC will be exposed to a higher risk of magnet quenches during periods of short beam lifetime. Collimators in the extraction region (IR6) assure the protection of magnets against asynchronous beam dumps, but they also intercept a fraction of the beam halo leaking from the betatron cleaning insertion. In this paper, we assess the risk of quenching nearby quadrupoles during beam lifetime drops. In particular, we present an empirical analysis of halo losses in IR6 using LHC Run 2 (2015-2018) beam loss monitor measurements. Based on these results, the halo-induced power density in magnet coils expected in HL-LHC is estimated using FLUKA Monte Carlo shower simulations.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-MOPAB002

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paper received ※ 19 May 2021 paper accepted ※ 13 July 2021 issue date ※ 22 August 2021

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MOPAB017

Influence of Injection Kicker Post-pulses on Storage of Ion Stack in NICA Collider

kicker, electron, injection, collider

93

E. Syresin, A. Tuzikov, N.O. Zagibin
JINR, Dubna, Moscow Region, Russia

The peculiarity of the injection kicker power supply in NICA collider is related to same post pulse of the magnetic field which is appeared after a regular injection pulse. The magnetic field of this post pulse became to an increase of the stack ion angle spread during each injection cycle. When the stack ion angles reaches the acceptance angle the ions are lost in the collider. Influence of the injection kicker post pulse on the storage of the ion stack is considered in this paper in presence of the electron cooling and ion electron recombination losses.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-MOPAB017

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paper received ※ 17 May 2021 paper accepted ※ 20 May 2021 issue date ※ 13 August 2021

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MOPAB041

Convergence Map with Action-Angle Variables Based on Square Matrix for Nonlinear Lattice Optimization

lattice, linear-dynamics, resonance, GUI

182

L.H. Yu, Y. Hidaka, F. Plassard, V.V. Smaluk
BNL, Upton, New York, USA
Y. Hao
FRIB, East Lansing, Michigan, USA

We apply square matrix method to obtain in high speed a "convergence map", which is similar but different from frequency map. The convergence map is obtained from solving nonlinear dynamical equation by iteration of perturbation method and study the convergence. The map provides information about the stability border of dynamical aperture. We compare the map with frequency map from tracking. The result indicates the new method may be applied in nonlinear lattice optimization, taking the advantage of the high speed (about 10~50 times faster) to explore x, y and the off-momentum phase space.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-MOPAB041

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paper received ※ 09 May 2021 paper accepted ※ 26 May 2021 issue date ※ 18 August 2021

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MOPAB134

Normalized Transverse Emittance Reduction via Ionization Cooling in MICE ’Flip Mode’

emittance, simulation, solenoid, experiment

474

P.B. Jurj
Imperial College of Science and Technology, Department of Physics, London, United Kingdom

Low emittance muon beams are central to the development of a Muon Collider and can significantly enhance the performance of a Neutrino Factory. The international Muon Ionization Cooling Experiment (MICE) has recorded several million individual muon tracks passing through a liquid hydrogen or a lithium hydride absorber and has demonstrated the ionization cooling of muon beams. Previous analysis used a restricted data set, and the beam matching was not perfect. In this analysis, beam sampling routines were employed to account for imperfections in beam matching at the entrance into the cooling channel and enable an improvement of the cooling measurement. A study of the normalized transverse emittance change in the MICE cooling channel set up in a flipped polarity magnetic field configuration is presented. Additionally, the evolution of the canonical angular momentum across the absorber is shown and the characteristics of the cooling effect are discussed.

Poster MOPAB134 [1.821 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-MOPAB134

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paper received ※ 19 May 2021 paper accepted ※ 09 June 2021 issue date ※ 27 August 2021

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MOPAB148

Liénard-Wiechert Numerical Radiation Modeling for Plasma Acceleration Experiments at FACET-II

radiation, plasma, acceleration, experiment

517

M. Yadav, G. Andonian, C.E. Hansel, N. Majernik, P. Manwani, B. Naranjo, J.B. Rosenzweig, O. Williams, Y. Zhuang
UCLA, Los Angeles, California, USA
G. Andonian
RadiaBeam, Marina del Rey, California, USA
O. Apsimon, A. Perera, C.P. Welsch
The University of Liverpool, Liverpool, United Kingdom
O. Apsimon, A. Perera, C.P. Welsch
Cockcroft Institute, Warrington, Cheshire, United Kingdom

Funding: This work was supported by DE-SC0009914 (UCLA) and the STFC Liverpool Centre for Doctoral Training on Data Intensive Science (LIV. DAT) under grant agreement ST/P006752/1.
Future plasma acceleration experiments at FACET-II will measure betatron radiation in order to provide single-shot non-destructive beam diagnostics. We discuss three models for betatron radiation: a new idealized particle tracking code with Liénard-Wiechert radiation, a Quasi-Static Particle-in-Cell (PIC) code with Liénard-Wiechert radiation, and a full PIC code with radiation computed via a Monte-Carlo QED Method. Predictions of the three models for the E-310 experiment are presented and compared. Finally, we discuss beam parameter reconstruction from the double differential radiation spectrum.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-MOPAB148

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paper received ※ 24 May 2021 paper accepted ※ 01 June 2021 issue date ※ 17 August 2021

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MOPAB178

Systematic Effects Limiting the Sensitivity of "Magic Energy" Proton EDM Rings

proton, dipole, pick-up, focusing

602

C. Carli, M. Haj Tahar
CERN, Geneva, Switzerland

Proposals to measure a possible Electric Dipole Moment (EDM) of protons in an electro-static storage ring are studied by a world-wide community. The machine is operated at the so-called "magic energy" to satisfy the "frozen spin" condition such that, without imperfections and with the well known magnetic moment of the particle, the spin is always oriented parallel to the direction of movement. The effect of a finite EDM is a build-up of a vertical spin component. Any effect, other than a finite EDM, leading as well to a build-up of a vertical spin limits the sensitivity of the experiment. Such "systematic effects" are caused by machine imperfections, such as magnetic fields inside the magnetic shield surrounding the ring, and misalignments of electro-static elements or of the RF cavity. Operation of the machine with counter-rotating beams helps mitigating some of the effects. The most dangerous effects are those, which cannot be disentangled from an EDM by combining measurements from both counter-rotating beams, such as an average residual radial magnetic field penetrating the magnetic shield or a combination of magnetic fields and misalignments of electric elements.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-MOPAB178

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paper received ※ 18 May 2021 paper accepted ※ 17 June 2021 issue date ※ 20 August 2021

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MOPAB213

Characterization of Linear Optics and Beam Parameters for the APS Booster with Turn-by-Turn BPM Data

booster, synchrotron, optics, kicker

703

X. Huang, H. Shang, C. Yao
ANL, Lemont, Illinois, USA

We take turn-by-turn (TBT) BPM data on the energy ramp of the APS Booster, and analyze the data with the independent component analysis. The extraction kicker was used to excite the betatron motion. The linear optics of the machine is characterized with the TBT BPM data. We also analyze the decoherence pattern of the kicked beam, from which we are able to derive beam distribution parameters, such as the momentum spread.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-MOPAB213

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paper received ※ 13 May 2021 paper accepted ※ 11 June 2021 issue date ※ 19 August 2021

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MOPAB214

Linear Optics Measurement for the APS Ring with Turn-by-Turn BPM Data

optics, quadrupole, lattice, storage-ring

707

X. Huang, V. Sajaev, Y.P. Sun, A. Xiao
ANL, Lemont, Illinois, USA

We measure the linear optics of the APS storage ring from turn-by-turn BPM data taken when the beam is excited with an injection kicker. Decoherence due to chromaticity and amplitude-dependent detuning is observed and compared to theoretic predictions. Independent component analysis is used to analyze the data, which separates the betatron normal modes and synchrotron motion, despite contamination of bad BPMs. The beta functions and phase advances are subsequently obtained. The method is used to study the linear optics perturbation of an insertion device.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-MOPAB214

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paper received ※ 12 May 2021 paper accepted ※ 09 June 2021 issue date ※ 01 September 2021

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MOPAB226

Analytical Description of the Steerer Parameters in the Bilinear-Exponential Model at DELTA

storage-ring, closed-orbit, coupling, simulation

737

S. Kötter
DELTA, Dortmund, Germany

At DELTA, a 1.5 GeV synchrotron radiation source operated by the TU Dortmund University, an analytical description of the steerer parameters in the bilinear-exponential (BE) model has been developed. The BE model describes the coupled orbit response in a storage ring. It is used in the closed-orbit bilinear-exponential analysis (COBEA) algorithm to decompose orbit response matrices into beta function, betatron phase, and a scaled dispersion. After introducing the BE model and the analytical steerer parameters, a simulation-based comparison of the BE model and another coupled orbit response model is presented.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-MOPAB226

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paper received ※ 19 May 2021 paper accepted ※ 08 June 2021 issue date ※ 11 August 2021

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MOPAB235

Transverse 2d Phase-Space Tomography Using Beam Position Monitor Data of Kicked Beams

emittance, optics, electron, storage-ring

763

K. Hwang, C.E. Mitchell, R.D. Ryne
LBNL, Berkeley, California, USA

Funding: U.S. Department of Energy under Contract No. DE-AC02-05CH11231
The time-series Beam Position Monitor (BPM) data of kicked beam is a function of lattice parameters and beam parameters including phase-space density. The decoherence model using the first-order detuning parameter has an exact solution when the beam is Gaussian. We parameterize the beam phase-space density by multiple Gaussian kernels of different weights, means, and sizes to formulate the inverse problem for 2D phase-space tomography. Numerical optimization and Bayesian inference are used to infer the beam density.

Poster MOPAB235 [1.253 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-MOPAB235

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paper received ※ 20 May 2021 paper accepted ※ 02 June 2021 issue date ※ 01 September 2021

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MOPAB248

Injection Schemes for the SOLEIL Upgrade

injection, storage-ring, lattice, synchrotron

796

M.-A. Tordeux, P. Alexandre, R. Ben El Fekih, P. Brunelle, L. Hoummi, A. Loulergue, L.S. Nadolski, R. Nagaoka
SOLEIL, Gif-sur-Yvette, France

Injection into the SOLEIL upgrade storage ring is much more challenging compared to the case of the current ring. Thanks to the experience gained in the development, manufacture and commissioning of a Multipole Injection Kicker (MIK) on the MAX IV 3 GeV storage ring, the SOLEIL pulsed magnet team is currently developing new MIK magnets that will serve as the basis for the injection schemes in the upgrade storage ring. We then propose two kinds of injections: firstly, a betatron off-axis injection that should be compatible with the full-coupling storage ring tuning, and secondly, a synchrotron on-axis injection by creating a large horizontal dispersion bump at the injection point.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-MOPAB248

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paper received ※ 19 May 2021 paper accepted ※ 21 May 2021 issue date ※ 26 August 2021

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MOPAB273

Nonlinear Coupling Resonances in X-Y Coupled Betatron Oscillations Near the Main Coupling Resonance in VEPP-2000 Collider

resonance, coupling, collider, experiment

863

S.A. Kladov, E. Perevedentsev
BINP SB RAS, Novosibirsk, Russia
S.A. Kladov, E. Perevedentsev
NSU, Novosibirsk, Russia

In the vicinity of the linear coupling resonance where the working point of the collider is positioned, we study the effect of nonlinear coupling resonances on the single-particle phase space, beam sizes and the waveform of coherent beam motion. The latter is interesting for diagnostics of the nonlinear dynamics.

Poster MOPAB273 [1.142 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-MOPAB273

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paper received ※ 19 May 2021 paper accepted ※ 28 May 2021 issue date ※ 21 August 2021

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MOPAB274

Two-Stream Effects in Coherent Beam-Beam Oscillations in VEPP-2000 Collider Near the Linear Coupling Resonance

coupling, collider, synchrotron, resonance

866

S.A. Kladov, E. Perevedentsev
BINP SB RAS, Novosibirsk, Russia
S.A. Kladov, E. Perevedentsev
NSU, Novosibirsk, Russia

Synchro-betatron motion of colliding bunches may cause limitations of the high-luminosity performance. For a round beam collider operated near the linear coupling resonance, we present theoretical predictions of the beam-beam coherent synchro-betatron oscillation behavior under the influence of x-y coupling.

Poster MOPAB274 [0.968 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-MOPAB274

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paper received ※ 19 May 2021 paper accepted ※ 02 June 2021 issue date ※ 02 September 2021

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MOPAB319

Development of a Fast Betatron Tune and Chromaticity Measurement System for COSY

acceleration, GUI, controls, resonance

983

P.J. Niedermayer, C. Böhme, B. Breitkreutz, V. Kamerdzhiev, A. Lehrach
FZJ, Jülich, Germany
A. Lehrach
RWTH, Aachen, Germany

A fast tune measurement is developed for the Cooler Synchrotron COSY at the Institut für Kernphysik of Forschungszentrum Jülich. Betatron oscillations of the beam are excited with a band-limited RF signal via a stripline kicker. Resonant transverse oscillations are then observed using capacitive beam position monitors. Based on the bunch-by-bunch beam position data the betatron tune is determined. The usage of bunch-by-bunch data is characteristic of the new system. It allows for a discrete tune measurement within a few milliseconds, as well as continuous tune monitoring during beam acceleration. The high precision tune measurement also enables determination of the beam chromaticity. Therefore, the beam momentum is varied by means of the RF frequency and the subsequent tune change is determined. For routine use during beam operation and experiments, the developed method is integrated into the control system.

Poster MOPAB319 [1.209 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-MOPAB319

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paper received ※ 19 May 2021 paper accepted ※ 16 June 2021 issue date ※ 12 August 2021

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MOPAB349

New Accelerator Beam Centerline (ABC) Production Line at Varex Imaging Corporation

linac, gun, detector, GUI

1087

A.V. Mishin
Varex Imaging, Salt Lake City, USA

In January 2017, a Salt Lake City Component Division of Varian Medical (Varian)*, producer of X-ray tubes, detectors, and imaging panels has been spun off, giving birth to a new public company Varex Imaging Corporation (Varex)**, which also includes the Security and Inspection Products (SIP) linac producer in Las Vegas. Based on Varian asset acquisition of two small LLCs*** in May 2016, 8 months prior to the transition, a new business branch within Varex has been established, which included distribution of the betatrons and detector arrays as well as pilot production line for Accelerator Beam Centerlines (ABC). In 3 years, we moved ABC production from Fremont, CA to Salt Lake in Utah and improved it; several ABCs have been designed, produced, and qualified. A number of new products in energy range of 1-20 MeV are under development, based on the new ABCs used as components for SIP linear accelerator systems and ABCs sold to third parties for applications other than Security and NDT. The new products will brag broad energy and dose rate regulation, smooth and reliable operation, providing extended benefits to our customers.
* - https://www.varian.com/
** - https://www.vareximaging.com/
*** - both Thought One LLC and Radmedex LLC have been dissolved in 2018 upon completion of the transition process

Poster MOPAB349 [2.182 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-MOPAB349

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paper received ※ 13 May 2021 paper accepted ※ 27 May 2021 issue date ※ 21 August 2021

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TUPAB059

Measurement of the Advanced Photon Source Lifetime at Different Level of Beta-Beating

quadrupole, storage-ring, optics, simulation

1496

Y.P. Sun
ANL, Lemont, Illinois, USA

Funding: The work is supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02-06CH11357.
Linear optics correction of a particle accelerator may not be perfect due to the existence of different errors sources in response matrix measurements and optics correction process. Previous numerical simulation study has shown that the single particle beam dynamics performance may be highly correlated with the level of residual beta-beating. In this paper, the machine study results on beam lifetime of the APS storage ring is presented. The experiment is performed at different level of predefined beta-beating with negligible betatron tunes variations. As expected, the measured beam lifetime has an inverse correlation with the level of beta-beating.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-TUPAB059

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paper received ※ 19 May 2021 paper accepted ※ 17 June 2021 issue date ※ 16 August 2021

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TUPAB083

Dual Energies in the LCLS Copper Linac

linac, quadrupole, feedback, klystron

1570

F.-J. Decker, C. Bianchini Mattison, D.K. Bohler, A. Brachmann, W.S. Colocho, S. Condamoor, M.L. Gibbs, K.H. Kim, A.A. Lutman, T.J. Maxwell, J.A. Mock, H.-D. Nuhn, J.C. Sheppard, H. Smith, T.J. Smith, M. Stanek, S. Zelazny, Z. Zhang, C.M. Zimmer
SLAC, Menlo Park, California, USA

For LCLS-II two undulators were installed at SLAC, one for soft and one for hard x-rays. Before the superconducting linac gets turned on the copper linac is providing beams at 120 Hz to these two beam destinations. The 120 Hz can be split in many different ratios between soft and hard via a pulsed magnet. To get an optimized beam for the quite different photon energies the pulsed linac components like modulators and RF can provide many different beam parameters, mainly energies and bunch lengths for the two undulator lines. How this was implemented with timing setups of triggers and finally after the split the necessary matching of the transverse phase space will be discussed.

Poster TUPAB083 [0.479 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-TUPAB083

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paper received ※ 19 May 2021 paper accepted ※ 27 May 2021 issue date ※ 21 August 2021

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TUPAB192

Studies on Momentum Collimation for CSNS-RCS Upgrades

collimation, bunching, space-charge, emittance

1855

Y.W. An, J. Chen, S.Y. Xu, Y. Yuan
IHEP, Beijing, People’s Republic of China
X.H. Lu, J.B. Yu
IHEP CSNS, Guangdong Province, People’s Republic of China

The CSNS project was a high intensity pulsed facility, and achieved the the design goal of 100kW in 2020. The upgrades of the CSNS are proposed, and the momentum collimator is a component of the upgrades. This paper will show the design scheme of the momentum collimator and the simulation results are also presented.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-TUPAB192

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paper received ※ 18 May 2021 paper accepted ※ 15 June 2021 issue date ※ 28 August 2021

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TUPAB219

Equilibrium and Nonlinear Beam Dynamics Parameters From Sirius Turn-by-Turn BPM Data

experiment, emittance, optics, factory

1935

X.R. Resende, M.B. Alves, L. Liu, F.H. de Sá
LNLS, Campinas, Brazil

A considerable amount of beam information is conveyed by Turn-by-Turn (TbT) data of Beam Position Monitors (BPM). In this work such data sets are analyzed for Sirius, the Brazilian 4th Generation 3GeV synchrotron light source. In particular, equilibrium and non-linear beam dynamics parameters determining decoherence patterns in TbT position data are estimated and compared with corresponding values of the nominal storage ring model.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-TUPAB219

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paper received ※ 20 May 2021 paper accepted ※ 23 June 2021 issue date ※ 15 August 2021

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TUPAB223

Design of Double- and Multi-Bend Achromat Lattices with Large Dynamic Aperture and Approximate Invariants

lattice, sextupole, storage-ring, resonance

1945

Y. Li, R.S. Rainer, V.V. Smaluk
BNL, Upton, New York, USA
K. Hwang, C.E. Mitchell, R.D. Ryne
LBNL, Berkeley, California, USA

Funding: Funded by U.S. Department of Energy (DOE) under Contract No. DE-SC0012704 (BNL) and DE-AC02-05CH11231 (LBNL), U.S. DOE Early Career Research Program under the Office of High Energy Physics.
A numerical method to design nonlinear double- and multi-bend achromat (DBA and MBA) lattices with approximate invariants of motion is described. The search for such nonlinear lattices is motivated by Fermilab’s Integrable Optics Test Accelerator (IOTA), whose design is based on an integrable Hamiltonian system with two invariants of motion. While it may not be possible to design an achromatic lattice for a dedicated synchrotron light source storage ring with one or more exact invariants of motion, it is possible to tune the sextupoles and octupoles in existing DBA and MBA lattices to produce approximate invariants. In our procedure, the lattice is tuned while minimizing the turn-by-turn fluctuations of the Courant-Snyder actions Jx and Jy at several distinct amplitudes, while simultaneously minimizing diffusion of the on-energy betatron tunes. The resulting lattices share some important features with integrable ones, such as a large dynamic aperture, trajectories confined to invariant tori, robustness to resonances and errors, and a large amplitude-dependent tune-spread.

Poster TUPAB223 [2.392 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-TUPAB223

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paper received ※ 10 May 2021 paper accepted ※ 15 June 2021 issue date ※ 20 August 2021

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TUPAB240

The Impact of Trajectory-Shaped Coil on the Beam Dynamics in the SC230 Superconducting Cyclotron

cyclotron, proton, extraction, induction

2002

I.D. Lyapin, O. Karamyshev, V. Malinin, D. Popov
JINR/DLNP, Dubna, Moscow region, Russia
G.A. Karamysheva
JINR, Dubna, Moscow Region, Russia

In this paper, we compared the effect of the cyclotron coil shape on the beam dynamics. Two models were created. The first has a conventional round coil, the second has a coil that follows the trajectory of the protons. Parameters of extracted beams are discussed.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-TUPAB240

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paper received ※ 19 May 2021 paper accepted ※ 27 May 2021 issue date ※ 21 August 2021

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TUPAB311

Nonlinear Correctors Tuning for the Collector Ring Isochronous Mode

sextupole, optics, controls, proton

2218

M.A. Lyalin, I. Koop, D.B. Shwartz
BINP SB RAS, Novosibirsk, Russia
I. Koop, M.A. Lyalin, D.B. Shwartz
NSU, Novosibirsk, Russia

One of the operating modes for the Collector Ring (CR) under construction in Darmstadt is the isochronous mode, in which the captured ions circulate with an equal period regardless of their momentum. The measurement of the orbital period T by the time-of-flight sensors makes it possible to precisely determine the mass to the charge ratio of the ion under study. For this, the change of the circulation period dT should not exceed 1·10^-6 for dT/T in the entire momentum acceptance of the 0.62%. Modeling in the Strategic Accelerator Design code showed that without nonlinear effects compensation, the orbital period variation is 1·10^-5. In this work, the parameters of nonlinear correctors, which are sextupoles and octupoles in CR, are determined, necessary for the isochronous mode implementation.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-TUPAB311

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paper received ※ 29 May 2021 paper accepted ※ 16 June 2021 issue date ※ 14 August 2021

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WEPAB009

Study of Harmonic Crab Cavity in EIC Beam-Beam Simulations

cavity, simulation, resonance, electron

2595

D. Xu, Y. Hao
FRIB, East Lansing, Michigan, USA
Y. Luo, C. Montag
BNL, Upton, New York, USA
J. Qiang
LBNL, Berkeley, California, USA

In the Electron-Ion Collider (EIC) design, crab cavities are adopted to compensate the geometric luminosity loss from the crossing angle. From previous studies, higher-order synchro-betatron resonances are excited since the hadron beam is long and the crossing angle is large. To reduce the luminosity degradation rate, different combinations of harmonic crab cavities are studied with both weak-strong and strong-strong simulation methods. The frequency map analysis (FMA) is also used for comparison. This study helps determine the crab cavity parameters for the future EIC.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-WEPAB009

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paper received ※ 17 May 2021 paper accepted ※ 23 June 2021 issue date ※ 28 August 2021

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WEPAB010

Full Range Tune Scan Studies Using Graphics Processing Units with CUDA in EIC Beam-Beam Simulations

simulation, resonance, GPU, cavity

2598

D. Xu, Y. Hao
FRIB, East Lansing, Michigan, USA
Y. Luo, C. Montag
BNL, Upton, New York, USA
J. Qiang
LBNL, Berkeley, California, USA

The hadron beam in the Electron-Ion Collider (EIC) suffers high order betatron and synchro-betatron resonances. In this paper, we present a weak-strong full range (0.0~0.5) fractional tune scan with a step size as small as 0.001. Multiple Graphics Processing Units (GPUs) are used to speed up the simulation. A code parallelized with MPI and CUDA is implemented. The good tune region from weak-strong scan is further checked by the self-consistent strong-strong simulation. This study provides beam dynamics guidance in choosing proper working points for the future EIC.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-WEPAB010

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paper received ※ 17 May 2021 paper accepted ※ 23 June 2021 issue date ※ 12 August 2021

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WEPAB302

COSY Machine-Model Optimization

dipole, operation, simulation, optics

3375

I. Bekman, J.H. Hetzel
FZJ, Jülich, Germany

Funding: Helmholtz Association
Successful operation of a particle accelerator requires accompanying model calculations. The model helps in understanding the machine and predicts the impact of a change in the settings (e.g. current of magnetic elements). For the COoler SYnchrotron (COSY) at Research Center Jülich the accelerator simulation software MAD-X is used to model the machine. The model parameters are steadily being improved based on various manual adjustments and analytical studies, however are hardly optimized all at once. This can be improved with machine learning methods. The model is used to predict measurable quantities, like Orbit Response Matrix (ORM) or betatron tunes. Several observables for different particle energies have been measured recently and the corresponding machine settings are available. We describe the effort to improve the agreement between measured and calculated ORMs and hence improve the agreement between model and (real) machine and report on the optimization using a multivariate algorithm (e.g. genetic algorithm). This facilitates the setup of COSY and will allow to perform high precision experiments e.g. a measurement of an electric dipole moment of deuterons at COSY.

Poster WEPAB302 [1.905 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-WEPAB302

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paper received ※ 14 May 2021 paper accepted ※ 28 July 2021 issue date ※ 20 August 2021

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THXA07

Driven 3D Beam Oscillations for Optics Measurements in Synchrotrons

optics, dipole, synchrotron, emittance

3704

L. Malina, J.M. Coello de Portugal, H. Timko, R. Tomás García
CERN, Geneva, Switzerland

Optics measurements in storage rings employ turn-by-turn data of transversely excited beams. Traditionally, to measure chromatic properties, the relative momentum is changed step-wise, which is time-consuming and almost impractical during the energy ramp. We present an optics measurement method based on adiabatic simultaneous 3-dimensional beam excitation, which is more time-efficient and well fitted for the energy ramp. This method was successfully demonstrated in the LHC utilising AC-dipoles in combination either with a slow RF-frequency modulation or a driven RF-phase modulation close to the synchrotron frequency. Faster longitudinal oscillations improve the accuracy of optics parameters inferred from the synchro-betatron sidebands. This paper reports on the experimental demonstration of optics measurements based on 3D driven beam excitations and the plans for LHC Run 3.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-THXA07

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paper received ※ 19 May 2021 paper accepted ※ 02 August 2021 issue date ※ 11 August 2021

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THPAB028

Beam-Beam Related Design Parameter Optimization for the Electron-Ion Collider

proton, electron, simulation, luminosity

3808

Y. Luo, J.S. Berg, M. Blaskiewicz, W. Fischer, X. Gu, H. Lovelace III, C. Montag, R.B. Palmer, S. Peggs, V. Ptitsyn, F.J. Willeke
BNL, Upton, New York, USA
Y. Hao, D. Xu
FRIB, East Lansing, Michigan, USA
H. Huang
ODU, Norfolk, Virginia, USA
E.A. Nissen, T. Satogata
JLab, Newport News, Virginia, USA
J. Qiang
LBNL, Berkeley, California, USA

Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy.
The design luminosity goal for the Electron-Ion Collider (EIC) is 1e34 cm^-2s⁻¹. To achieve such a high luminosity, the EIC design adopts high bunch intensities, flat beams at the interaction point (IP) with a small vertical β^*-function, and a high collision frequency, together with crab cavities to compensate the geometrical luminosity loss due to the large crossing angle of 25mrad. In this article, we present our strategies and approaches to obtain the design luminosity by optimizing some key beam-beam related design parameters. Through our extensive strong-strong and weak-strong beam-beam simulations, we found that beam flatness, electron and proton beam size matching at the IP, electron and proton working points, and synchro-betatron resonances arising from the crossing angle collision play a crucial role in proton beam size growth and luminosity degradation. After optimizing those parameters, we found a set of beam-beam related design parameters to reach the design luminosity with an acceptable beam-beam performance.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-THPAB028

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paper received ※ 17 May 2021 paper accepted ※ 28 July 2021 issue date ※ 25 August 2021

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THPAB174

T-BMT Spin Resonance Tracker Code for He3 with Six Snakes

resonance, polarization, emittance, HOM

4101

V.H. Ranjbar, H. Huang, Y. Luo, F. Méot, V. Ptitsyn
BNL, Upton, New York, USA
G.H. Hoffstaetter, D. Sagan
Cornell University (CLASSE), Cornell Laboratory for Accelerator-Based Sciences and Education, Ithaca, New York, USA
F. Lin, V.S. Morozov
JLab, Newport News, Virginia, USA

Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy .
Polarization lifetime for He3 using two and six snakes are studied using the T-BMT Spin Resonance Tracker code. This code integrates a reduced spinor form of the T-BMT equation including only several spin resonances and the kinematics of synchrotron motion. It was previously benchmarked against RHIC polarization lifetime under the two snake system *.
* Phys. Rev.Accel. Beams 22 (2019) 9, 091001

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-THPAB174

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paper received ※ 20 May 2021 paper accepted ※ 02 July 2021 issue date ※ 28 August 2021

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THPAB189

New Techniques to Compute the Linear Tune

collider, simulation, damping, experiment

4142

G. Russo, M. Giovannozzi
CERN, Geneva, Switzerland
G. Franchetti
GSI, Darmstadt, Germany

Tune determination in numerical simulations is an essential aspect of nonlinear beam dynamics studies. In particular, because it allows probing whether an initial condition is close to resonance, and it enables assessment of the stability of the orbit, i.e. whether the motion is regular or chaotic. In this paper, results of recently developed techniques to obtain accurate tune computation from numerical simulation data are presented and discussed in detail.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-THPAB189

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paper received ※ 18 May 2021 paper accepted ※ 26 July 2021 issue date ※ 19 August 2021

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