Author: Albright, S.C.P.
Paper Title Page
WEPAB210 Beam Commissioning of the New 160 MeV H Injection System of the CERN PS Booster 3116
 
  • E. Renner, S.C.P. Albright, F. Antoniou, F. Asvesta, H. Bartosik, C. Bracco, G.P. Di Giovanni, L.O. Jorat, E.H. Maclean, M. Meddahi, B. Mikulec, T. Prebibaj, G. Rumolo, P.K. Skowroński, W.J.M. Weterings
    CERN, Geneva, Switzerland
 
  A key com­po­nent to meet­ing the bright­ness tar­gets of the LHC In­jec­tors Up­grade (LIU) pro­ject at CERN is the new 160 MeV H charge ex­change in­jec­tion sys­tem into the Pro­ton Syn­chro­tron Booster. This sys­tem has been in beam com­mis­sion­ing since De­cem­ber 2020, op­ti­miz­ing the beam pro­duc­tion schemes for tai­lor­ing dif­fer­ent beams to the re­spec­tive user-de­fined bright­ness tar­gets. In this paper, se­lected mea­sure­ments from the beam com­mis­sion­ing pe­riod are pre­sented, char­ac­ter­iz­ing the sys­tem’s flex­i­bil­ity to pro­duce the re­quired wide range of trans­verse emit­tances. The dis­cus­sion fo­cuses on the es­sen­tial op­ti­miza­tion of the in­jec­tion set-up to min­i­mize space charge dri­ven emit­tance blow-up and in­jec­tion er­rors. The re­sults are com­pleted by se­lected com­par­isons with multi-par­ti­cle sim­u­la­tion mod­els of the in­jec­tion process.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-WEPAB210  
About • paper received ※ 19 May 2021       paper accepted ※ 19 July 2021       issue date ※ 29 August 2021  
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THPAB183 New Longitudinal Beam Production Methods in the CERN Proton Synchrotron Booster 4130
 
  • S.C.P. Albright, F. Antoniou, F. Asvesta, H. Bartosik, C. Bracco, E. Renner
    CERN, Meyrin, Switzerland
  • E. Renner
    TU Vienna, Wien, Austria
 
  As part of the LHC In­jec­tors Up­grade (LIU) pro­ject, sig­nif­i­cant im­prove­ments were made to the CERN Pro­ton Syn­chro­tron Booster (PSB) dur­ing the 2019/2020 long shut­down, in­clud­ing a new Finemet-based wide­band RF sys­tem, ren­o­vated lon­gi­tu­di­nal beam con­trol, and a new mag­netic cycle. To meet the re­quire­ments of the di­verse ex­per­i­men­tal pro­gram, the PSB pro­vides beams with in­ten­si­ties span­ning three or­ders of mag­ni­tude and a large range of lon­gi­tu­di­nal emit­tances. To max­i­mize the bright­ness, in par­tic­u­lar for the LHC beams, the volt­ages at low en­ergy are de­signed to re­duce the im­pact of trans­verse space charge using a sec­ond RF har­monic in bunch length­en­ing mode. At high en­er­gies, the risk of lon­gi­tu­di­nal mi­crowave in­sta­bil­ity is avoided by op­ti­miz­ing the lon­gi­tu­di­nal dis­tri­b­u­tion to raise the in­sta­bil­ity thresh­old. RF phase noise is ap­plied to pro­vide con­trolled lon­gi­tu­di­nal emit­tance blow-up and to shape the lon­gi­tu­di­nal dis­tri­b­u­tion. This paper dis­cusses the de­sign of the RF func­tions used to meet the beam spec­i­fi­ca­tions, whilst en­sur­ing lon­gi­tu­di­nal sta­bil­ity.  
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DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-THPAB183  
About • paper received ※ 18 May 2021       paper accepted ※ 22 July 2021       issue date ※ 20 August 2021  
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