Keyword: betatron
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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.  
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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. 		 
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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.  
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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.  
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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.  
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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
 		 
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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 icon 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. 		 
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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. 		 
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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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