Author: Baudrier, M.
Paper Title Page
TUPOPA05 RFQ Performance During RF Conditioning and Beam Commissioning at ESS 418
 
  • R. Zeng, G.S. Fedel, B. Jones, R. Miyamoto, D.J.P. Nicosia, D. Noll, A.G. Sosa, A.M. Svensson, E. Trachanas
    ESS, Lund, Sweden
  • M. Baudrier
    CEA-DRF-IRFU, France
  • A.C. Chauveau, M.J. Desmons, P. Hamel, O. Piquet
    CEA-IRFU, Gif-sur-Yvette, France
  • F. Grespan
    INFN/LNL, Legnaro (PD), Italy
  
  RFQ at ESS has been suc­cess­fully gone through RF con­di­tion­ing, RF re-con­di­tion­ing and low duty cycle beam com­mis­sion­ing. RFQ ful­fills re­quired func­tions and over­all per­for­mance is sat­is­fac­tory. RF con­di­tion­ing, three RF re-con­di­tion­ings after LEBT in­ter­ven­tion and beam com­mis­sion­ing will be re­ported and RFQ per­for­mance dur­ing these pe­ri­ods will be de­scribed. RFQ per­for­mance in a large ex­tent is re­flected by dy­nam­ics and in­ter­ac­tions be­tween RF, cav­ity and beam. Thanks to ad­vanced hard­ware ca­pa­bil­i­ties and in­tel­li­gent soft­ware in­tel­li­gence, ob­ser­va­tion of those dy­nam­ics and in­ter­ac­tions are done in de­tailed level. Analy­sis of those dy­nam­ics and in­ter­ac­tion will be in­tro­duced. Some tech­niques to deal with chal­lenges re­sulted from those dy­nam­ics and in­ter­ac­tions will also be dis­cussed.  
poster icon Poster TUPOPA05 [25.281 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-TUPOPA05  
About • Received ※ 18 August 2022 — Revised ※ 25 August 2022 — Accepted ※ 31 August 2022 — Issue date ※ 05 September 2022
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THPOGE01 Study on the Multipactor Barriers of the SARAF-Phase 2 Low-Beta and High-Beta Superconducting Cavities 802
 
  • G. Ferrand, L. Maurice
    CEA-IRFU, Gif-sur-Yvette, France
  • M. Baudrier, N. Pichoff
    CEA-DRF-IRFU, France
  
  CEA is com­mit­ted to de­liv­er­ing a Medium En­ergy Beam Trans­fer line and a su­per­con­duct­ing linac (SCL) for SARAF ac­cel­er­a­tor in order to ac­cel­er­ate 5 mA beam of ei­ther pro­tons from 1.3 MeV to 35 MeV or deuterons from 2.6 MeV to 40 MeV. The SCL con­tains 13 half-wave res­onator (HWR) low beta cav­i­ties (β= 0.09) at 176 MHz and 14 HWR high-beta cav­i­ties (β = 0.18) at 176 MHz. The low-beta and high-beta se­ries were qual­i­fied in 2021 and 2022 re­spec­tively. This con­tri­bu­tion will focus on the ob­ser­va­tion of the mul­ti­pactor bar­ri­ers for all cavi-ties. It will pre­sent se­ries of data ob­tained dur­ing the con­di­tion­ing of these cav­i­ties  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-THPOGE01  
About • Received ※ 27 July 2022 — Revised ※ 23 August 2022 — Accepted ※ 07 September 2022 — Issue date ※ 15 September 2022
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THPOGE23 Vertical Electro-Polishing of 704 MHz Resonators Using Ninja Cathode: Gradients Over 40 MV/m Achieved on ESS Single-Cell Cavity 844
THOPA08   use link to see paper's listing under its alternate paper code  
 
  • F. Éozénou, M. Baudrier, E. Cenni, E. Fayette, L. Maurice, C. Servouin
    CEA-DRF-IRFU, France
  • H. Hayano, H. Ito, S. Kato, T. Kubo, H. Monjushiro, T. Saeki
    KEK, Ibaraki, Japan
  • Y.I. Ida, K. Nii, T.Y. Yamaguchi
    MGH, Hyogo-ken, Japan
  • G. Jullien
    CEA-IRFU, Gif-sur-Yvette, France
  
  CEA, KEK and Marui Gal­va­niz­ing Com­pany have been col­lab­o­rat­ing to apply the Ver­ti­cal Elec­trop­o­l­ish­ing (VEP) process of el­lip­ti­cal SRF cav­i­ties to a 704MHz sin­gle-cell ESS-type cav­ity, using a ro­tat­ing so called and patented "Ninja" cath­ode. First pre­sented re­sults* were promis­ing with a gra­di­ent of 27MV/m achieved, with­out any heat treat­ment ap­plied. The per­for­mance has been pushed fur­ther since. The cav­ity has un­der­gone a heat treat­ment at 650°C dur­ing 10h, fol­lowed by a final VEP se­quence and a bak­ing at 120°C dur­ing 48h hours. The achieved gra­di­ent at 2K was 44MV/m (power lim­i­ta­tion), and the qual­ity fac­tor Q0 ex­ceed­ing 5·1010 up to 10 MV/m. The su­pe­ri­or­ity of VEP com­pared to stan­dard "BCP" chem­i­cal treat­ment is demon­strated and we in­tend now to scale the process to 5-Cell β=0.86 ESS cav­ity. We also in­tend to push fur­ther the per­for­mance by ap­ply­ing "2-step bak­ing" (75°C and 120°C) pro­posed by FNAL, which was suc­cess­fully ap­plied at CEA Saclay on 1300MHz sin­gle-cell res­onators with gra­di­ents above 50MV/m achieved after VEP bulk treat­ment.
* TUPCAV001, SRF 2021 		 
slides icon Slides THPOGE23 [0.868 MB]  
poster icon Poster THPOGE23 [0.918 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-THPOGE23  
About • Received ※ 24 August 2022 — Revised ※ 01 September 2022 — Accepted ※ 09 September 2022 — Issue date ※ 16 September 2022
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