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MOPAB322 Electronics for Bead-pull Measurement of Radio Frequency Accelerating Structures in LEHIPA controls, cavity, software, rfq 993
 
  • S. Rosily, S. Krishnagopal
    Homi Bhbha National Institute (HBNI), DAE, Mumbai, India
  • S. Krishnagopal, S. Singh
    BARC, Mumbai, India
  
  For car­ry­ing out bead-pull char­ac­ter­i­sa­tion of RFQ and DTL at the Low En­ergy High In­ten­sity Pro­ton Ac­cel­er­a­tor of BARC, a con­troller for si­mul­ta­ne­ous mo­tion of 64 axis, tuners or post cou­plers, was de­vel­oped. Also, a bead mo­tion con­troller with in­te­grated phase mea­sure­ment sen­sor was de­vel­oped. The paper dis­cusses the re­quire­ments of the sys­tem, the ar­chi­tec­ture of the con­trol sys­tems, op­er­a­tion and re­sults. The re­sults ob­tained from the sen­sor was com­pared to that ob­tained using an in­de­pen­dent USB VNA. The ad­van­tages of the sys­tem es­pe­cially with ad­di­tion of in­ter­nal phase mea­sure­ment sen­sor in­clud­ing min­imis­ing po­si­tion error, flex­i­bil­ity in bead­pull to se­lec­tively in­crease res­o­lu­tion at spec­i­fied lo­ca­tions and ease of im­ple­ment­ing auto-tun­ing al­go­rithms are dis­cussed.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-MOPAB322  
About • paper received ※ 20 May 2021       paper accepted ※ 24 May 2021       issue date ※ 14 August 2021  
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MOPAB360 Anomalous Skin Effect Study of Normal Conducting Film impedance, plasma, ECR, vacuum 1119
 
  • B.P. Xiao, M. Blaskiewicz, T. Xin
    BNL, Upton, New York, USA
  
  Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-SC0012704 with the U.S. Department of Energy.
For the ra­diofre­quency (RF) ap­pli­ca­tions of nor­mal con­duct­ing film with large mean free path at high fre­quency and low tem­per­a­ture, the anom­alous skin ef­fect dif­fers con­sid­er­ably from the nor­mal skin ef­fect with field de­cay­ing ex­po­nen­tially in the film. Start­ing from the re­la­tion­ship be­tween the cur­rent and the elec­tric field (E field) in the film, the am­pli­tude of E field along the film depth is cal­cu­lated, and is found to be non-mo­not­o­nic. The sur­face im­ped­ance is found to have a min­i­mum value at cer­tain film thick­ness. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-MOPAB360  
About • paper received ※ 17 May 2021       paper accepted ※ 25 June 2021       issue date ※ 17 August 2021  
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TUPAB031 Construction and Installation of the New CERN Proton Synchrotron Internal Beam Dumps vacuum, MMI, shielding, proton 1409
 
  • K.G. Andersen, M. Calviani, A. Cherif, T. Coiffet, A. De Macedo, S. Devidal, J.-M. Geisser, S.S. Gilardoni, M.M.J. Gillet, E. Grenier-Boley, J.M. Heredia, A. Majbour, F. Monnet, M.R. Monteserin, F.-X. Nuiry, D. Pugnat, G. Romagnoli, Y.D.R. Seraphin, J.A.F. Somoza, N. Thaus
    CERN, Geneva 23, Switzerland
  
  In the frame­work of the CERN Large Hadron Col­lider In­jec­tors Up­grade (LIU) Pro­ject, the Pro­ton Syn­chro­tron (PS) has been equipped with two new mov­able In­ter­nal Dumps (PSID), each of them ca­pa­ble of ab­sorb­ing par­ti­cle beams of an en­ergy of up to 100 kJ. These dumps re­place the old In­ter­nal Dumps, which have been op­er­ated in the ac­cel­er­a­tor com­plex since their in­stal­la­tion in 1975 until their de­com­mis­sion­ing and re­moval from the ma­chine dur­ing the sec­ond LHC Long Shut down (LS2). This con­tri­bu­tion will ad­dress the con­struc­tion and test­ing phases of the new PSIDs, in­clud­ing the as­sem­bly of the dump core, its ac­tu­a­tion sys­tem and the re­spec­tive shield­ing, me­chan­i­cal run­ning-in tests, metrol­ogy ad­just­ments, Ul­tra-High Vac­uum (UHV) and im­ped­ance ac­cep­tance tests. The de­scribed in­stal­la­tion work was com­pleted suc­cess­fully, and the new gen­er­a­tion Dumps are cur­rently op­er­a­tional in the PS ma­chine.  
poster icon Poster TUPAB031 [3.146 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-TUPAB031  
About • paper received ※ 18 May 2021       paper accepted ※ 27 May 2021       issue date ※ 26 August 2021  
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TUPAB292 Automation of the ReAccelerator Linac Phasing cavity, detector, controls, linac 2170
 
  • D.J. Barofsky, A.I. Henriques, T.J. Kabana, A.S. Plastun
    FRIB, East Lansing, Michigan, USA
  • D.B. Crisp, A. Lapierre, S. Nash, A.C.C. Villari
    NSCL, East Lansing, Michigan, USA
  
  Funding: This work is supported by the National Science Foundation under Grant No. PHY-1565546
The ReAc­cel­er­a­tor (ReA) at the Na­tional Su­per­con­duct­ing Cy­clotron Lab­o­ra­tory at Michi­gan State Uni­ver­sity is a unique fa­cil­ity, as it of­fers the pos­si­bil­ity to reac­cel­er­ate not only sta­ble, but rare-iso­tope beams pro­duced by fast-pro­jec­tile frag­men­ta­tion or fis­sion. At ReA, beams are ac­cel­er­ated using a Ra­dio-Fre­quency-Quadru­pole and a su­per­con­duct­ing lin­ear ac­cel­er­a­tor be­fore being de­liv­ered to ex­per­i­ments. Beam prepa­ra­tion time plays a major role in the avail­abil­ity of beams to ex­per­i­ments. One of the major time con­sum­ing tasks is the linac phas­ing, since there are 23 res­onator cav­i­ties to be phased, usu­ally with very low beam in­ten­si­ties. This pro­ce­dure was au­to­mated using a com­bi­na­tion of EPICS (Ex­per­i­men­tal Physics and In­dus­trial Con­trols Sys­tem) In/Out­put Con­trollers (IOCs) and IOC trig­gered scripts to scan the res­onator phase delay and mea­sure the change in beam en­ergy. We have de­vel­oped user-friendly tools to phase the linac, which have been tested, mak­ing the task of phas­ing sub­stan­tially eas­ier. In this pre­sen­ta­tion, we will pre­sent our method­ol­ogy, chal­lenges faced, tools de­vel­oped, and ini­tial re­sults of the ap­pli­ca­tion for au­tomat­ing the phas­ing of the ReA linac. 		 
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DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-TUPAB292  
About • paper received ※ 19 May 2021       paper accepted ※ 02 June 2021       issue date ※ 29 August 2021  
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TUPAB295 Upgrade to the EPICS Control System at the Argonne Wakefield Accelerator Test Facility controls, EPICS, data-acquisition, LLRF 2173
 
  • W. Liu, J.M. Byrd, D.S. Doran, G. Ha, A.N. Johnson, P. Piot, J.G. Power, J.H. Shao, G. Shen, C. Whiteford, E.E. Wisniewski
    ANL, Lemont, Illinois, USA
  
  Funding: US Department of Energy, Office of Science
The Ar­gonne Wake­field Ac­cel­er­a­tor (AWA) Test Fa­cil­ity has used a com­pletely home­brewed, MS Win­dows-based con­trol sys­tem for the last 20 years. In an ef­fort to mod­ern­ize the con­trol sys­tem and pre­pare for an ac­tive ma­chine learn­ing pro­gram, the AWA will work with the Ad­vanced Pho­ton Source (APS) con­trols group to up­grade its con­trol sys­tem to EPICS. The EPICS con­trol sys­tem is ex­pected to fa­cil­i­tate col­lab­o­ra­tions and sup­port the fu­ture growth of AWA. An overview of the pre­vi­ous AWA con­trol and data ac­qui­si­tion sys­tem is pre­sented, along with a vi­sion and path for com­plet­ing the EPICS up­grade. 		 
poster icon Poster TUPAB295 [1.108 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-TUPAB295  
About • paper received ※ 19 May 2021       paper accepted ※ 01 July 2021       issue date ※ 30 August 2021  
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TUPAB322 Redesign and Upgrade of the LHC Access Control System controls, site, hardware, PLC 2249
 
  • T. Hakulinen, S. Di Luca, G. Godineau, R. Nunes, G. Smith
    CERN, Meyrin, Switzerland
  
  The old LHC Ac­cess Con­trol Sys­tem (LACS) was based on a sin­gle ac­cess con­trol so­lu­tion, which in­te­grated soft­ware and hard­ware into one mono­lithic ap­pli­ca­tion en­com­pass­ing all the dif­fer­ent sub­sys­tems (ac­cess con­trol, video sur­veil­lance, in­ter­phones, bio­m­e­try, equip­ment con­trol, safety el­e­ments). Both the hard­ware and soft­ware were ap­proach­ing end-of-life by the ven­dor be­fore the CERN Long Shut­down 2 (LS2). The new de­sign is based on a dis­trib­uted ap­proach, where the dif­fer­ent sub­sys­tems are in­te­grated in a flex­i­ble man­ner with well-de­fined in­ter­faces, which will per­mit much eas­ier sin­gle sub-sys­tem man­age­ment, up­grades, and even full re­place­ments if nec­es­sary. From the sys­tem point of view, the focus is on the ad­van­tages that this re­design brings to sys­tem op­er­a­tion, test­ing, and man­age­ment. Pro­ce­du­rally the in­ter­est is in the over­all man­age­ment of a very com­plex in-place up­grade of a sys­tem, where the new im­ple­men­ta­tion needed to co­ex­ist with the old dur­ing its con­stant si­mul­ta­ne­ous so­lic­i­ta­tion over the LS2.  
poster icon Poster TUPAB322 [6.906 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-TUPAB322  
About • paper received ※ 15 May 2021       paper accepted ※ 28 May 2021       issue date ※ 28 August 2021  
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TUPAB370 Development of Long Coil Dynamic Magnetic Field Measurement System for Dipole Magnets of HEPS Booster dipole, booster, storage-ring, injection 2384
 
  • Y.Q. Liu, C.D. Deng, W. Kang, L. Li, S. Li, X. Wu, Y.W. Wu, J.X. Zhou
    IHEP, Beijing, People’s Republic of China
  • C.D. Deng, Y.W. Wu
    DNSC, Dongguan, People’s Republic of China
  
  A mag­netic field mea­sure­ment sys­tem for di­pole mag­nets of High En­ergy Pho­ton Source Booster is de­signed and de­vel­oped. The sys­tem uses the long coil up­flow method to mea­sure the dy­namic in­te­gral field of the mag­net, and the long coil trans­verse-trans­la­tion method to mea­sure the in­te­gral field dis­tri­b­u­tion error of the mag­net. In this paper, the de­sign and im­ple­men­ta­tion of the mag­netic mea­sur­ing sys­tem are in­tro­duced in de­tail, and the mag­netic field mea­sure­ment re­sults of the pro­to­type mag­net are shown. The mea­sure­ment re­sults show that the re­peata­bil­ity of the dy­namic in­te­gral field mea­sure­ment sys­tem is about 2 in 10,000, and the re­peata­bil­ity of the uni­form dis­tri­b­u­tion of the in­te­gral field is bet­ter than 1 in 10,000, which meets the test re­quire­ments of the dis­crete in­te­gral field of bulk mag­nets ±1 parts per thou­sand and the uni­for­mity of the in­te­gral field ±5×10-4@​6GeV and ±1×10-3 @0.5GeV.  
poster icon Poster TUPAB370 [1.475 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-TUPAB370  
About • paper received ※ 16 May 2021       paper accepted ※ 16 June 2021       issue date ※ 17 August 2021  
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TUPAB374 Development of a Quench Detection System for the FAIR Superconducting Devices controls, quadrupole, superconducting-magnet, electron 2394
 
  • V. Raginel, M. Dziewiecki, W. Freisleben, P.B. Szwangruber, L. Theiner
    GSI, Darmstadt, Germany
  
  The Fa­cil­ity for An­tipro­ton and Ion Re­search (FAIR), which is presently under con­struc­tion in Darm­stadt (Ger­many), will in­cor­po­rate a large va­ri­ety of su­per­con­duct­ing de­vices like mag­nets, cur­rents leads and bus bars. These com­po­nents de­pend on an ac­tive pro­tec­tion in case of a tran­si­tion from su­per­con­duct­ing to the re­sis­tive state, so-called quench. In this frame­work, a FAIR Quench De­tec­tion Sys­tem (F-QDS) is being de­vel­oped based on ana­log and dig­i­tal elec­tron­ics and will be im­ple­mented in sev­eral ma­chines of the FAIR com­plex. This paper de­scribes the de­vel­op­ment of the F-QDS. An overview of the F-QDS elec­tron­ics is given fol­lowed by a de­scrip­tion of the sys­tem in­te­gra­tion to the in­fra­struc­ture of var­i­ous ma­chines. Ini­tial test re­sults of the F-QDS pro­to­type sys­tem are pre­sented and dis­cussed.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-TUPAB374  
About • paper received ※ 25 May 2021       paper accepted ※ 05 July 2021       issue date ※ 22 August 2021  
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WEPAB169 Towards Ultra-Smooth Alkali Antimonide Photocathode Epitaxy lattice, cathode, emittance, electron 3001
 
  • E.J. Montgomery
    Private Address, Bolingbrook, USA
  • O. Chubenko, G.S. Gevorkyan, S.S. Karkare, P. Saha
    Arizona State University, Tempe, USA
  • R.G. Hennig, J.T. Paul
    University of Florida, Gainesville, Florida, USA
  • C. Jing, S. Poddar
    Euclid Beamlabs, Bolingbrook, USA
  • H.A. Padmore
    LBNL, Berkeley, California, USA
  
  Funding: Work supported by Department of Energy, Office of Science, Office of Basic Energy Sciences, under grant number DE-SC0020575.
Pho­to­cath­odes lead in bright­ness among elec­tron emit­ters, but trans­verse mo­menta are un­avoid­ably nonzero. Ul­tra-low trans­verse emit­tance would en­able brighter, higher en­ergy x-ray free-elec­tron lasers (FEL), im­proved col­lid­ers, and more co­her­ent, de­tailed ul­tra­fast elec­tron dif­frac­tion/mi­croscopy (UED/UEM). Al­though high quan­tum ef­fi­ciency (QE) is de­sired to avoid laser-in­duced non­lin­ear­i­ties, the state-of-the-art is 100 pC bunches from cop­per, 0.4 mm-mrad emit­tance. Ad­vances to­wards 0.1 mm-mrad re­quire ul­tra-low emit­tance, high QE, cryo-com­pat­i­ble ma­te­ri­als. We re­port ef­forts to­wards epi­tax­ial growth of ce­sium an­ti­monide on lat­tice matched sub­strates. DFT cal­cu­la­tions were per­formed to downs­e­lect from a list of can­di­date lat­tice matches. Co-evap­o­ra­tions achiev­ing >3% QE at 532 nm fol­lowed by atomic force and Kelvin probe mi­croscopy (AFM and KPFM) show ul­tra-low 313 pm rms (root mean square) phys­i­cal and 2.65 mV rms chem­i­cal rough­ness. We sim­u­late rough­ness-in­duced mean trans­verse en­ergy (MTE) to pre­dict <1 meV from rough­ness ef­fects at 10 MV/m in as-grown op­ti­cally thick cath­odes, promis­ing low emit­tance via epi­tax­ial growth. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-WEPAB169  
About • paper received ※ 19 May 2021       paper accepted ※ 02 June 2021       issue date ※ 11 August 2021  
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WEPAB282 The Consolidation of the CERN Beam Interlock System operation, diagnostics, controls, timing 3309
 
  • R.L. Johnson, C. Martin, T. Podzorny, I. Romera, R. Secondo, J.A. Uythoven
    CERN, Geneva, Switzerland
  
  The Beam In­ter­lock Sys­tem (BIS) is a ma­chine pro­tec­tion sys­tem that pro­vides es­sen­tial in­ter­lock con­trol through­out the CERN ac­cel­er­a­tor com­plex. The cur­rent BIS has been in ser­vice since 2006; as such, it is ap­proach­ing the end of its op­er­a­tional life­time, with most com­po­nents being ob­so­lete. A sec­ond ver­sion of the Beam In­ter­lock Sys­tem, "BIS2", is cur­rently under de­vel­op­ment and will re­place the cur­rent sys­tem. BIS2 aims to be more flex­i­ble by sup­ply­ing ad­di­tional on-board di­ag­nos­tic tools, while also im­prov­ing the over­all safety by adding more re­dun­dancy. Cru­cially, BIS2 in­creases the num­ber of crit­i­cal paths that can be in­ter­locked by al­most 50%, pro­vid­ing an im­por­tant flex­i­bil­ity for fu­ture ad­di­tional in­ter­lock­ing re­quests. BIS2 will come into op­er­a­tion for the LHC in run 4 (2027) and will re­main in op­er­a­tion until the end of the planned life­time of HL-LHC. In this paper, we will focus on the Beam In­ter­lock Con­troller Man­ager board (CIBM), which is at the heart of BIS2. Since this mod­ule works closely with many other sys­tems that are sim­i­lar in de­sign to those in BIS1, we will com­pare how BIS2 im­proves upon BIS1, and jus­tify the rea­sons why these changes were made.  
poster icon Poster WEPAB282 [0.378 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-WEPAB282  
About • paper received ※ 18 May 2021       paper accepted ※ 14 July 2021       issue date ※ 23 August 2021  
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WEPAB315 360 Degree Panoramic Photographs During the Long Shutdown 2 of the CERN Machines and Facilities database, site, experiment, HOM 3410
 
  • T.W. Birtwistle, A. Ansel, S. Bartolomé Jiménez, B. Feral, G. Lacerda, A.-L. Perrot, J.F. Piñera Ovejero
    CERN, Geneva, Switzerland
  
  Stud­ies and prepa­ra­tion of ac­tiv­i­ties are key to the suc­cess of short tech­ni­cal stops and longer shut­downs in CERN’s ac­cel­er­a­tor com­plex. The ’Panorama’ tool of­fers a vir­tual tour of our fa­cil­i­ties, and thanks to in­te­gra­tion with other CERN tools, fur­ther com­ple­men­tary in­for­ma­tion can be eas­ily re­trieved, in­clud­ing lay­out in­for­ma­tion, equip­ment de­tail, and a his­tory of changes. The tool was used to sup­port the prepa­ra­tion and the ex­e­cu­tion of works dur­ing the Long Shut­down 2. It helped to op­ti­mize ma­chine (ac­cel­er­a­tor/de­cel­er­a­tor) in­ter­ven­tions and hence re­duce po­ten­tial ra­di­a­tion ex­po­sure, as well as to ease in­te­gra­tion stud­ies. Thanks to its user-friend­li­ness, the tool is now also used for ed­u­ca­tional and out­reach ac­tiv­i­ties. The cur­rent in­stan­ti­a­tion of the ’Panorama’ tool and re­lated processes is pre­sented, along­side the ben­e­fits that the tool can bring to the ac­cel­er­a­tor com­plex com­mu­nity. A par­tic­u­lar focus is on the Long Shut­down 2. Fu­ture planned de­vel­op­ments and im­prove­ments are also de­scribed.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-WEPAB315  
About • paper received ※ 11 May 2021       paper accepted ※ 14 June 2021       issue date ※ 21 August 2021  
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WEPAB334 Development of Diffusion Bonded Joints of AA6061 Aluminum Alloy to AISI 316LN Stainless Steel for Sirius Planar Undulators vacuum, undulator, MMI, operation 3459
 
  • R.L. Parise, O.R. Bagnato, R. Defavari, M.W.A. Feitosa, F.R. Francisco, D.Y. Kakizaki, R.D. Ribeiro
    LNLS, Campinas, Brazil
  
  LNLS has been com­mis­sion­ing Sir­ius, a 4th-gen­er­a­tion syn­chro­tron light source. The com­mis­sion­ing of the beam­lines has been mainly done by using pla­nar un­du­la­tor, which uses in-house built alu­minum vac­uum cham­bers with ul­tra-high vac­uum tight bimetal­lic flanges. In order to man­u­fac­ture these flanges, dif­fu­sion bonded joints of AA6061 alu­minum alloy to AISI 316LN stain­less steel were de­vel­oped. Dif­fu­sion bond­ing was car­ried out at 400-500°C for 45-60 min, ap­ply­ing a load of 9.8MPa in a vac­uum fur­nace. Also, the sur­face prepa­ra­tion for Al and SS was in­ves­ti­gated. SEM ob­ser­va­tion re­vealed that an 1-3 µm re­ac­tion layer was formed at the AA6061/Ni-plated in­ter­face. The in­ter­metal­lic com­pound Al3Ni was iden­ti­fied in the re­ac­tion layer. The ob­tained Al/SS joints showed mean ul­ti­mate strength of 84 MPa, with the frac­ture oc­cur­ring in the Al/re­ac­tion layer in­ter­face. Bake-out cy­cles fol­lowed by leak tests were car­ried out to val­i­date the process and ap­prove their use on the pla­nar un­du­la­tor vac­uum cham­bers. Two un­du­la­tors with Al/SS flanges have been in­stalled and are under op­er­a­tion in the stor­age ring.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-WEPAB334  
About • paper received ※ 17 May 2021       paper accepted ※ 17 June 2021       issue date ※ 31 August 2021  
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WEPAB365 CERN BDF Prototype Target Operation, Removal and Autopsy Steps target, radiation, extraction, operation 3559
 
  • R. Franqueira Ximenes, O. Aberle, C. Ahdida, P. Avigni, M. Battistin, L. Bianchi, L.R. Buonocore, S. Burger, J. Busom, M. Calviani, J.P. Canhoto Espadanal, M. Casolino, M. Di Castro, M.A. Fraser, S.S. Gilardoni, S. Girod, J.L. Grenard, D. Grenier, M. Guinchard, R. Jacobsson, M. Lamont, E. Lopez Sola, A. Ortega Rolo, A. Perillo-Marcone, Y. Pira, B. Riffaud, V. Vlachoudis, L. Zuccalli
    CERN, Meyrin, Switzerland
  
  The Beam Dump Fa­cil­ity (BDF), cur­rently in the study phase, is a pro­posed gen­eral-pur­pose fixed tar­get fa­cil­ity at CERN. Ini­tially will host the Search for Hid­den Par­ti­cles (SHiP) ex­per­i­ment, in­tended to in­ves­ti­gate the ori­gin of dark mat­ter and other weakly in­ter­act­ing par­ti­cles. The BDF par­ti­cle pro­duc­tion tar­get is lo­cated at the core of the fa­cil­ity and is em­ployed to fully ab­sorb the high in­ten­sity (400 GeV/c) Super Pro­ton Syn­chro­tron (SPS) beam. To val­i­date the de­sign of the pro­duc­tion tar­get, a down­scaled pro­to­type was tested with the beam at CERN in 2018 in the North Area pri­mary area in a ded­i­cated test at 35 kW av­er­age beam power. This con­tri­bu­tion de­tails the BDF pro­to­type tar­get op­er­a­tion, fully re­mote re­moval in­ter­ven­tion, and fore­seen post-ir­ra­di­a­tion ex­am­i­na­tion plans.  
poster icon Poster WEPAB365 [1.691 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-WEPAB365  
About • paper received ※ 18 May 2021       paper accepted ※ 15 June 2021       issue date ※ 25 August 2021  
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THPAB014 Matlab Simulations of the Helium Liquefier in the FREIA Laboratory simulation, HOM, cavity, coupling 3781
 
  • E. Waagaard, R.J.M.Y. Ruber, V.G. Ziemann
    Uppsala University, Uppsala, Sweden
  
  We de­scribe sim­u­la­tions that track a state vec­tor with pres­sure, tem­per­a­ture, and gas flow through the he­lium liq­ue­fier in the FREIA lab­o­ra­tory. Most com­po­nents, in­clud­ing three-way heat ex­chang­ers, are rep­re­sented by ma­tri­ces that allow us to track the state through the sys­tem. The only non-lin­ear el­e­ment is the Joule-Thom­son valve, which is rep­re­sented by a non-lin­ear map for the state vari­ables. Re­al­is­tic prop­er­ties for the en­thalpy and other ther­mo­dy­namic quan­ti­ties are taken into ac­count with the help of the Cool­prop li­brary. The re­sult­ing sys­tem of equa­tions is rapidly solved by it­er­a­tion and shows good agree­ment with the ob­served LHe yield with and with­out ni­tro­gen pre-cool­ing.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-THPAB014  
About • paper received ※ 13 May 2021       paper accepted ※ 14 July 2021       issue date ※ 26 August 2021  
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THPAB190 Optimising and Extending a Single-Particle Tracking Library for High Parallel Performance GPU, lattice, simulation, hardware 4146
 
  • M. Schwinzerl, H. Bartosik, R. De Maria, G. Iadarola, K. Paraschou
    CERN, Geneva, Switzerland
  • A. Oeftiger
    GSI, Darmstadt, Germany
  • M. Schwinzerl
    KFUG/IMSC, Graz, Austria
  
  Six­Track­Lib is a li­brary for per­form­ing beam-dy­nam­ics sim­u­la­tions on highly par­al­lel com­put­ing de­vices such as shared mem­ory multi-core proces­sors or graph­i­cal pro­cess­ing units (GPUs). Its sin­gle-par­ti­cle ap­proach fits very well with par­al­lel im­ple­men­ta­tions with rea­son­able base­line per­for­mance, mak­ing such a li­brary an in­ter­est­ing build­ing block for var­i­ous use cases, in­clud­ing sim­u­la­tions cov­er­ing col­lec­tive ef­fects. We de­scribe op­ti­miza­tions to im­prove their per­for­mance on Six­Track­Lib’s main tar­get plat­forms and the as­so­ci­ated per­for­mance gains. Fi­nally, we out­line the im­ple­mented tech­ni­cal in­ter­faces and ex­ten­sions that allow Six­Track­Lib to be used in a wider range of ap­pli­ca­tions and stud­ies.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-THPAB190  
About • paper received ※ 18 May 2021       paper accepted ※ 14 July 2021       issue date ※ 16 August 2021  
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THPAB217 Lightsource Unified Modeling Environment (LUME), a Start-to-End Simulation Ecosystem simulation, FEL, software, electron 4212
 
  • C.E. Mayes, A.L. Edelen, P. Fuoss, J.R. Garrahan, A. Halavanau, F. Ji, J. Krzywiński, W. Lou, N.R. Neveu, H.H. Slepicka
    SLAC, Menlo Park, California, USA
  • J.C. E, C. Fortmann-Grote
    EuXFEL, Schenefeld, Germany
  • C.M. Gulliford, D. Sagan
    Cornell University (CLASSE), Cornell Laboratory for Accelerator-Based Sciences and Education, Ithaca, New York, USA
  • L. Gupta
    University of Chicago, Chicago, Illinois, USA
  • A. Huebl, R. Lehé
    LBNL, Berkeley, USA
  
  SLAC is de­vel­op­ing the Light­source Uni­fied Mod­el­ing En­vi­ron­ment (LUME) for ef­fi­cient mod­el­ing of X-ray free elec­tron laser (XFEL) per­for­mance. This pro­ject takes a holis­tic ap­proach start­ing with the sim­u­la­tion of the elec­tron beams, to the pro­duc­tion of the pho­ton pulses, to their trans­port through the op­ti­cal com­po­nents of the beam­line, to their in­ter­ac­tion with the sam­ples and the sim­u­la­tion of the de­tec­tors, and fi­nally fol­lowed by the analy­sis of sim­u­lated data. LUME lever­ages ex­ist­ing, well-es­tab­lished sim­u­la­tion codes, and pro­vides stan­dard in­ter­faces to these codes via open-source Python pack­ages. Data are ex­changed in stan­dard for­mats based on openPMD and its ex­ten­sions. The plat­form is built with an open, well-doc­u­mented ar­chi­tec­ture so that sci­ence groups around the world can con­tribute spe­cific ex­per­i­men­tal de­signs and soft­ware mod­ules, ad­vanc­ing both their sci­en­tific in­ter­ests and a broader knowl­edge of the op­por­tu­ni­ties pro­vided by the ex­cep­tional ca­pa­bil­i­ties of X-ray FELs.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-THPAB217  
About • paper received ※ 20 May 2021       paper accepted ※ 20 July 2021       issue date ※ 19 August 2021  
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THPAB221 Multi-Objective Optimization with ACE3P and IMPACT cathode, cavity, simulation, lattice 4223
 
  • D.A. Bizzozero, J. Qiang
    LBNL, Berkeley, California, USA
  • L. Ge, Z. Li, C.-K. Ng, L. Xiao
    SLAC, Menlo Park, California, USA
  
  Funding: This work is supported by the Director of the Office of Science of the US Department of Energy under contracts DE-AC02-05-CH11231 and DE-AC02-76-SF00515.
Photo in­jec­tor de­sign is an im­por­tant con­sid­er­a­tion in the con­struc­tion of next-gen­er­a­tion ac­cel­er­a­tors. In cur­rent in­jec­tor op­ti­miza­tion, com­po­nents (e.g. RF cav­i­ties) are in­di­vid­u­ally shape-op­ti­mized for per­for­mance sub­ject to re­quire­ments such as peak sur­face field, shunt im­ped­ance, and res­o­nant fre­quency. Once these com­po­nent shapes are de­ter­mined, beam dy­nam­ics sim­u­la­tions op­ti­mize the in­jec­tor lat­tice by ad­just­ing pa­ra­me­ters such as the am­pli­tude and phase of the dri­ving fields. How­ever, this form of beam dy­nam­ics op­ti­miza­tion is re­stricted by the fixed geom­e­try and field pro­file of the com­po­nents. To op­ti­mize ac­cel­er­a­tor de­sign more gen­er­ally, a cou­pled op­ti­miza­tion of the cav­ity shape and beam pa­ra­me­ters is re­quired. For this cou­pled op­ti­miza­tion prob­lem, we have cre­ated an in­te­grated ACE3P-IM­PACT work­flow. Within this work­flow, com­po­nent geome­tries are ad­justed, field modes are com­puted with Omega3P (a mod­ule in the ACE3P suite), and beam dy­nam­ics are sim­u­lated with IM­PACT-T. This work­flow is en­cap­su­lated into a multi-ob­jec­tive op­ti­miza­tion al­go­rithm using the DEAP* and libEnsem­ble** Python li­braries to yield a Pareto-op­ti­mal set of so­lu­tions for a sim­ple in­jec­tor model.
* F.-A. Fortin et al, DEAP: Evolutionary Algorithms Made Easy, J Mach Learn Res, 13, 2171-2175, July 2012
** S. Hudson et al, libEnsemble User Manual, Argonne National Laboratory, Rev 0.7.1, 2020 		 
poster icon Poster THPAB221 [1.842 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-THPAB221  
About • paper received ※ 19 May 2021       paper accepted ※ 02 August 2021       issue date ※ 14 August 2021  
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THPAB259 High Level Applications for Sirius Accelerators Control controls, EPICS, operation, MMI 4314
 
  • A.C.S. Oliveira, M.B. Alves, L. Liu, X.R. Resende, F.H. de Sá
    LNLS, Campinas, Brazil
  
  Sir­ius is a 4th gen­er­a­tion 3 GeV syn­chro­tron light source that has just fi­nalised the first com­mis­sion­ing phase at the Brazil­ian Cen­ter for Re­search in En­ergy and Ma­te­ri­als (CNPEM) cam­pus in Camp­inas, Brazil. The large num­ber of process vari­ables and large com­plex­ity of the sub­sys­tems in this type of ma­chine re­quires the de­vel­op­ment of tools to sim­plify the com­mis­sion­ing and op­er­a­tion of the ac­cel­er­a­tors. This paper de­scribes some of the high level con­trol tools de­vel­oped for the ac­cel­er­a­tors com­mis­sion­ing and fu­ture op­er­a­tion.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-THPAB259  
About • paper received ※ 19 May 2021       paper accepted ※ 13 July 2021       issue date ※ 21 August 2021  
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THPAB289 Design and Manufacture of Solenoid Center Deviation Measurement Device solenoid, neutron, framework, induction 4366
 
  • X. Wu, C.D. Deng, W. Kang, L. Li, S. Li, Y.Q. Liu, Y.W. Wu, J.X. Zhou
    IHEP, Beijing, People’s Republic of China
  
  The so­le­noids are widely used both in con­ven­tional mag­nets and su­per­con­duct­ing mag­nets in par­ti­cle ac­cel­er­a­tors. The lon­gi­tu­di­nal fields along the lon­gi­tu­di­nal di­rec­tion of the so­le­noids are usu­ally mea­sured with the Hall probe mea­sure­ment sys­tem. How­ever, in some cases, the de­vi­a­tion be­tween the mag­netic cen­ter and me­chan­i­cal cen­ter of the so­le­noid is an­other im­por­tant pa­ra­me­ter and has to be mea­sured ac­cu­rately. In this paper, a de­vice is de­signed and de­vel­oped to mea­sure the cen­ter de­vi­a­tion of the so­le­noid, which can be both used in con­ven­tional mag­nets and su­per­con­duct­ing mag­nets. After the de­vice is fin­ished, some tests are made in the so­le­noid to check whether the data is cor­rect. For the nu­mer­i­cal sim­u­la­tion and analy­sis of the mag­netic field in­side the so­le­noid, the TOSCA code was cho­sen right from start. The re­sults of the analy­sis are com­pared to the re­sult of the tests.  
poster icon Poster THPAB289 [1.001 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-THPAB289  
About • paper received ※ 14 May 2021       paper accepted ※ 27 July 2021       issue date ※ 22 August 2021  
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