Author: Lagniel, J.-M.
Paper Title Page
TUA3I1 SPIRAL2 Commissioning and Operations 106
 
  • A.K. Orduz, M. Di Giacomo, J.-M. Lagniel, G. Normand
    GANIL, Caen, France
  • D.U. Uriot
    CEA-DRF-IRFU, France
  
  The SPI­RAL2 linac is now suc­cess­fully com­mis­sioned; H⁺, 4He2+, D⁺ and 18O6+ have been ac­cel­er­ated up to nom­i­nal pa­ra­me­ters and 18O7+ and 40Ar14+ beams have been also ac­cel­er­ated up to 7 MeV/A. The main steps with 5 mA H⁺, D⁺ beams and with 0.6 mA 18O6+ are de­scribed. The gen­eral re­sults of the com­mis­sion­ing of the RF, cryo­genic and di­ag­nos­tics sys­tems, as well as the pre­lim­i­nary re­sults of the first ex­per­i­ments on NFS are pre­sented. In ad­di­tion of an im­prove­ment of the match­ing to the linac, the tun­ing pro­ce­dures of the 3 Medium En­ergy Beam Trans­port (MEBT) re­bunch­ers and 26 linac SC cav­i­ties were pro­gres­sively im­proved to reach the nom­i­nal pa­ra­me­ters in op­er­a­tion, start­ing from the clas­si­cal ¿sig­na­ture match­ing method¿. The dif­fer­ent cav­ity tun­ing meth­ods de­vel­oped to take into ac­count our par­tic­u­lar sit­u­a­tion (very low en­ergy and large phase ex­ten­sion) are de­scribed. The tools de­vel­oped for an ef­fi­cient linac tun­ing in op­er­a­tion, e.g. beam en­ergy and in­ten­sity changes are also dis­cussed.  
slides icon Slides TUA3I1 [9.358 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-HB2023-TUA3I1  
About • Received ※ 01 October 2023 — Revised ※ 06 October 2023 — Accepted ※ 10 October 2023 — Issued ※ 24 October 2023
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WEA3I1 Synchronous Phases and Transit Time Factor 241
 
  • J.-M. Lagniel
    GANIL, Caen, France
  
  Syn­chro­nous phases (¿s) and tran­sit time fac­tors (T) are THE key pa­ra­me­ters for linac de­signs and op­er­a­tions. While the cou­ple (¿s, T) is still our way of think­ing the lon­gi­tu­di­nal beam dy­nam­ics, it is im­por­tant to have in mind that the orig­i­nal ¿Panof­sky¿ de­f­i­n­i­tion of these pa­ra­me­ters is no longer valid in the case of high ac­cel­er­at­ing gra­di­ents lead­ing to high par­ti­cle ve­loc­ity changes and in the case of multi-gap cav­i­ties. In this case, a new (¿s, T) de­f­i­n­i­tion al­low­ing to keep both ac­cel­er­a­tion and lon­gi­tu­di­nal fo­cus­ing prop­er­ties is pro­posed. Ex­am­ples are given in the SPI­RAL2 linac case.  
slides icon Slides WEA3I1 [2.369 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-HB2023-WEA3I1  
About • Received ※ 27 September 2023 — Revised ※ 12 October 2023 — Accepted ※ 13 October 2023 — Issued ※ 17 October 2023
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THBP22 On Liouvillian High Power Beam Accumulation 511
 
  • J.-M. Lagniel
    GANIL, Caen, France
  • M.E. Eshraqi, N. Milas
    ESS, Lund, Sweden
  
  Funding: This work is co-funded by the European Union
It is ac­knowl­edged that the in­jec­tion of high power pro­ton beams into syn­chro­trons must be done using strip­ping in­jec­tion of H⁻ beams which are ac­cel­er­ated by an in­jec­tor, as done in many fa­cil­i­ties world­wide such as ISIS, JPARC, SNS and CERN. How­ever, this tech­nique is not nec­es­sar­ily the only way of ac­cu­mu­la­tion and in some cases might not rep­re­sent the best choice. For ex­am­ple in the case of the ESS­nuSB Ac­cu­mu­la­tor Ring, ac­cel­er­at­ing the pro­tons in­ject­ing them to the ring could rep­re­sent sav­ings in cap­i­tal cost, re­duced risk of losses in the linac and trans­fer lines and sim­pli­fi­ca­tion to the over­all pro­ject. This work pre­sents the de­vel­op­ment of a method al­low­ing to op­ti­mize the 4D Li­ou­vil­lian ac­cu­mu­la­tion of high-power pro­ton and heavy ion beams and fin­ishes with a dis­cus­sion on the pros and cons of pro­ton in­jec­tion com­pared to more tra­di­tional H⁻ strip­ping in­jec­tion method. 		 
poster icon Poster THBP22 [2.126 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-HB2023-THBP22  
About • Received ※ 01 October 2023 — Revised ※ 05 October 2023 — Accepted ※ 11 October 2023 — Issued ※ 28 October 2023
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