Author: Dolenc Kittelmann, I.
Paper Title Page
TUP004 Detector Response Studies of the ESS Ionization Chamber 183
 
  • I. Dolenc Kittelmann, V. Grishin
    ESS, Lund, Sweden
  • P. Boutachkov
    GSI, Darmstadt, Germany
  • E. Effinger, A.T. Lernevall, W. Viganò, C. Zamantzas
    CERN, Meyrin, Switzerland
  
  The Eu­ro­pean Spal­la­tion Source (ESS), cur­rently under con­struc­tion in Lund, Swe­den, will be a pulsed neu­tron source based on a pro­ton linac. The ESS linac is de­signed to de­liver a 2GeV beam with peak cur­rent of 62.5mA at 14 Hz to a ro­tat­ing tung­sten tar­get for neu­tron pro­duc­tion. One of the most crit­i­cal el­e­ments for pro­tec­tion of an ac­cel­er­a­tor is a Beam Loss Mon­i­tor­ing (BLM) sys­tem. The sys­tem is de­signed to pro­tect the ac­cel­er­a­tor from beam-in­duced dam­age and un­nec­es­sary ac­ti­va­tion of the com­po­nents. The main ESS BLM sys­tem is based on ion­iza­tion cham­ber (IC) de­tec­tors. The de­tec­tor was orig­i­nally de­signed for the LHC at CERN re­sult­ing in pro­duc­tion of 4250 mon­i­tors in 2006-2008. In 2014-2017 a new pro­duc­tion of 830 de­tec­tors with a mod­i­fied de­sign was car­ried out to re­plen­ish spares for LHC and make a new se­ries for ESS and GSI. This con­tri­bu­tion fo­cuses on the re­sults from a mea­sure­ment cam­paigns per­formed at the HRM (High-Ra­di­a­tion to Ma­te­ri­als) fa­cil­ity at CERN, where de­tec­tor re­sponse of the ESS type IC has been stud­ied. The re­sults may be of in­ter­est for other fa­cil­i­ties, that are using ex­ist­ing or plan to use new gen­er­a­tion of LHC type IC mon­i­tors as BLM de­tec­tors.  
DOI • reference for this paper ※ doi:10.18429/JACoW-IBIC2023-TUP004  
About • Received ※ 04 September 2023 — Revised ※ 08 September 2023 — Accepted ※ 16 September 2023 — Issue date ※ 21 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
Cite • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)