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Peters, A.

Paper Title Page
TH-09 Upgrade of the HIT Injector LINAC-Frontend 183
 
  • S. Yaramyshev, W. Barth, M. Maier, A. Orzhekhovskaya, B. Schlitt, H. Vormann
    GSI, Darmstadt
  • R. Cee, A. Peters
    HIT, Heidelberg
  
 

The Ther­a­py Linac in Hei­del­berg (HIT) was suc­cess­ful­ly com­mis­sioned in 2006. Re­quired beam pa­ram­e­ters were reached ex­cept of the beam in­ten­si­ty. The achieved par­ti­cle trans­mis­sion for C4+ (de­sign ion) is sig­nif­i­cant­ly lower than de­sign. Par­ti­cle loss­es are main­ly ob­served in the RFQ. One crit­i­cal point is the match­ing sec­tion of the RFQ elec­trodes - Input Ra­di­al Match­er (IRM). The orig­i­nal de­sign re­quires too rigid and nar­row beam Twiss-pa­ram­e­ters at the RFQ en­trance. Also the mea­sured emit­tance is about twice high­er com­pared to the de­sign. Nu­mer­i­cal­ly and ex­per­i­men­tal­ly it was proven that the solenoid, used for the beam match­ing to the RFQ, is not able to pro­vide for the nec­es­sary beam size and con­ver­gence. As it was shown by beam dy­nam­ics sim­u­la­tions using the code DY­NAMION, a minor mod­i­fi­ca­tion of the IRM al­lows for an im­prove­ment of the beam trans­mis­sion (up to 50%). The pro­posed mea­sure was re­al­ized for an ad­vanced HIT-RFQ-lay­out, which is re­cent­ly under test stage. The same mod­i­fi­ca­tion is al­ready pro­posed for the linac fron­tend at Ital­ian Hadron­ther­a­py Cen­ter (CNAO, Pavia).

  

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