Author: Kocevar, H.
Paper Title Page
TU1I02 Beam Instrumentation Performance During Commissioning of the ESS Normal Conducting LINAC 136
 
  • I.D. Kittelmann, R.A. Baron, E.C. Bergman, E.M. Donegani, V. Grishin, H. Hassanzadegan, H. Kocevar, N. Milas, R. Miyamoto, M. Mohammednezhad, F. Nilen, D. Noll, K.E. Rosengren, T.J. Shea, R. Tarkeshian, C.A. Thomas
    ESS, Lund, Sweden
  
  Once con­structed, the Eu­ro­pean Spal­la­tion Source (ESS) will be a 5MW pulsed neu­tron source based on a 2 GeV pro­ton linac de­liv­er­ing 2.86 ms long pulses at a 14 Hz rep­e­ti­tion rate. This paper fo­cuses on the beam in­stru­men­ta­tion per­for­mance dur­ing the re­cent linac beam com­mis­sion­ing up to drift tube linac (DTL) tank 4 with 74 MeV out­put en­ergy. In­stru­men­ta­tion and mea­sure­ment re­sults will be pre­sented for beam pa­ra­me­ters such as cur­rent, po­si­tion, en­ergy, emit­tance and beam loss.
Proposal by Peter, same proposal as ID 1283 by Wim. Alternative speaker Cyrille Thomas (ESS). 		 
slides icon Slides TU1I02 [6.143 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-IBIC2023-TU1I02  
About • Received ※ 07 September 2023 — Revised ※ 08 September 2023 — Accepted ※ 13 September 2023 — Issue date ※ 01 October 2023
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TUP038 BCM System Optimization for ESS Beam Commissioning through the DTL Tank4 277
 
  • H. Hassanzadegan, R.A. Baron, S. Gabourin, H. Kocevar, M. Mohammednezhad, J.F.J. Murari, S. Pavinato, K.E. Rosengren, T.J. Shea, R. Zeng
    ESS, Lund, Sweden
  • K. Czuba, P.K. Jatczak
    Warsaw University of Technology, Institute of Electronic Systems, Warsaw, Poland
  
  The ESS BCM sys­tem is not only used for beam mea­sure­ment but it also plays an im­por­tant role for ma­chine pro­tec­tion par­tic­u­larly in the nor­mal-con­duct­ing part of the linac. Dur­ing the pre­vi­ous beam com­mis­sion­ings to the MEBT and DTL1 FCs and be­fore the cav­i­ties were fully con­di­tioned, RF break­downs and other types of dis­charges in the cav­i­ties had a major im­pact on beam avail­abil­ity due to the Fast ma­chine pro­tec­tion func­tions of the BCM. Fol­low­ing an in­ves­ti­ga­tion on the root cause of the beam trips, the con­fig­u­ra­tion of the ma­chine pro­tec­tion func­tions was mod­i­fied to im­prove beam avail­abil­ity in the more re­cent beam com­mis­sion­ing to the DTL4 FC. In ad­di­tion to this, some op­ti­miza­tions were made in the BCM sys­tem to im­prove beam mea­sure­ment, and a few more func­tions were added based on new re­quire­ments. This paper re­ports on these im­prove­ments and the re­sults ob­tained dur­ing the beam com­mis­sion­ing through the DTL4.  
poster icon Poster TUP038 [2.040 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-IBIC2023-TUP038  
About • Received ※ 31 July 2023 — Revised ※ 11 September 2023 — Accepted ※ 14 September 2023 — Issue date ※ 14 September 2023
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WEP001 Non-invasive Profilers for the Cold Part of ESS Accelerator 326
 
  • J. Marroncle, P. Abbon, F. Belloni, F. Bénédetti, T. Hamelin, J.-Ph. Mols, L. Scola
    CEA-DRF-IRFU, Grenoble, France
  • B. Bolzon, N. Chauvin, D. Chirpaz-Cerbat, M. Combet, M.J. Desmons, Y. Gauthier, C. Lahonde-Hamdoun, Ph. Legou, O. Leseigneur, Y. Mariette, V. Nadot, M. Oublaid, G. Perreu, F. Popieul, B. Pottin, Y. Sauce, J. Schwindling, F. Senée, O. Tuske, S. Tzvetkov
    CEA-IRFU, Gif-sur-Yvette, France
  • I. Dolenc Kittelmann, A.A. Gevorgyan, H. Kocevar, R. Tarkeshian, C.A. Thomas
    ESS, Lund, Sweden
  
  Sev­eral Non-in­va­sive Pro­file Mon­i­tors are being in-stalled along the ac­cel­er­a­tor to sup­port the com­mis­sion­ing, tun­ing and op­er­a­tion of the pow­er­ful pro­ton based ESS lin­ear ac­cel­er­a­tor. In the low en­ergy parts of the ESS linac (3.6 MeV to 90 MeV), the resid­ual gas pres­sure is high enough to mea­sure the trans­verse beam pro­file by using flu­o­res­cence in­duced by the beam on the gas mol­e­cules. How­ever, in the ESS linac sec­tions above 90 MeV, pro­tons are ac­cel­er­ated by su­per­con­duc­tive cav­i­ties work­ing at cryo­genic tem­per­a­tures and high vac­uum. There­fore, the sig­nal based on the flu­o­res­cence process is too weak, while ion­iza­tion can coun­ter­act this draw­back. We have pro­vided five IPM (Ion­iza­tion Pro­file Mon­i­tors) pairs for en­er­gies rang­ing from 100 to 600 MeV. The de­sign of such mon­i­tors is chal­leng­ing due to weak sig­nal (as a re­sult of high pro­ton en­ergy and low pres­sure <10-9 mbar), tight space con­straints in­side the vac­uum cham­ber, space charge ef­fect, ISO-5 clean­li­ness re­quire­ment, and elec­trode po­lar­iza­tion at ±15 kV. This pub­li­ca­tion will de­tail the de­vel­op­ment we fol­lowed to ful­fil the ESS re­quire­ments.  
poster icon Poster WEP001 [2.190 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-IBIC2023-WEP001  
About • Received ※ 03 September 2023 — Revised ※ 08 September 2023 — Accepted ※ 13 September 2023 — Issue date ※ 27 September 2023
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