Author: Fystro, G.I.
Paper Title Page
MOPAB123 Radiation Safety Considerations For The APS Upgrade Injector 445
 
  • K.C. Harkay, J.R. Calvey, S. Chitra, G.I. Fystro, M.J. Henry, E.E. Heyeck, B.J. Micklich, K.P. Wootton
    ANL, Lemont, Illinois, USA
 
  Funding: Work supported by U. S. Department of Energy, Office of Science, under Contract No. DE-AC02-06CH11357.
The Ad­vanced Pho­ton Source Up­grade (APS-U) is a high-per­for­mance fourth-gen­er­a­tion stor­age ring light source based on multi­bend achro­mat op­tics. As such, APS-U will re­quire on-axis in­jec­tion. The in­jec­tors will need to sup­ply full-cur­rent bunch re­place­ment in the ring; there­fore, the in­jected bunch charge will be up to five times higher than what is typ­i­cal for APS. A pro­gram was con­ducted to mea­sure the ra­di­a­tion dose above the in­jec­tor trans­port line to the APS stor­age ring for both nor­mal op­er­a­tion con­di­tions and con­trolled loss sce­nar­ios. Stan­dard sur­vey me­ters were used to record the dose. A re­view of the dose data iden­ti­fied op­por­tu­ni­ties to min­i­mize the po­ten­tial dose under nor­mal APS-U high charge op­er­a­tion and fault con­di­tions; these in­clude im­prov­ing the sup­ple­men­tal shield­ing and adding en­gi­neered con­trols. In ad­di­tion, the dose data pro­vide a bench­mark for eval­u­at­ing new ra­di­a­tion mon­i­tors for APS-U.
 
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DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-MOPAB123  
About • paper received ※ 18 May 2021       paper accepted ※ 24 May 2021       issue date ※ 12 August 2021  
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MOPAB124 APS Booster Injection Horizontal Trajectory Control Upgrade 449
 
  • C. Yao, J.R. Calvey, G.I. Fystro, A.F. Pietryla, H. Shang
    ANL, Lemont, Illinois, USA
 
  Funding: * Work supported by the U.S. Department of Energy, Office of Science, under Contract No. DE-ACO2-O6CH11357.
The APS booster is a 7-GeV elec­tron syn­chro­tron with a 0.5-sec­ond cycle. The booster runs a set of in­jec­tion con­trol pro­grams that cor­rect the beam tra­jec­tory in the hor­i­zon­tal and lon­gi­tu­di­nal planes, and the be­ta­tron tunes. Re­cently we de­vel­oped a sin­gle-turn BPM con­trollaw pro­gram for hor­i­zon­tal tra­jec­tory con­trol to re­place the pre­vi­ous FFT based hor­i­zon­tal con­trollaw pro­gram. We pre­sent the sys­tem con­fig­u­ra­tion and re­sults.
 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-MOPAB124  
About • paper received ※ 15 May 2021       paper accepted ※ 27 May 2021       issue date ※ 21 August 2021  
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THPAB082 Recent Operational Experience with Thermionic RF Guns at the APS 3959
 
  • Y. Sun, M. Borland, G.I. Fystro, X. Huang, H. Shang
    ANL, Lemont, Illinois, USA
 
  Funding: Work supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02-06CH11357
The elec­tron beam at the Ar­gonne Ad­vanced Pho­ton Source (APS) is gen­er­ated from an S-band thermionic RF gun. There are two lo­ca­tions at the fron­tend of the linac where thermionic RF guns are in­stalled – RG1 and RG2. Three so-called gen­er­a­tion-III guns are avail­able, two are in­stalled at RG1 and RG2, one is a spare. In re­cent years, these guns are show­ing signs of aging after over a cou­ple of decades of op­er­a­tions. RF trips started to occur, and we had to re­duce the nom­i­nal op­er­at­ing rf power to al­le­vi­ate the prob­lem. In ad­di­tion, beam gen­er­ated by RG1 suf­fers from low trans­porta­tion ef­fi­ciency from the gun to the linac, and beam tra­jec­tory is un­sta­ble which re­sults in charge in­sta­bil­i­ties. Re­cently, APS ob­tained a new type of pro­to­type gun and it was beam com­mis­sioned in the linac. In this paper, we re­port our op­er­a­tional ex­pe­ri­ence with these thermionic rf guns in­clud­ing thermionic-cath­ode beam ex­trac­tion, gun front-end op­ti­miza­tion for max­i­mum charge trans­mis­sion through the linac, linac lat­tice setup to match beam for in­jec­tion into the Par­ti­cle Ac­cu­mu­la­tor Ring (PAR) and op­ti­miza­tion for max­i­mum PAR in­jec­tion ef­fi­ciency.
 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-THPAB082  
About • paper received ※ 19 May 2021       paper accepted ※ 28 July 2021       issue date ※ 26 August 2021  
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