Author: Lorentz, B.
Paper Title Page
TU3I1
 Deceleration of Highly Charged Heavy Ion Beams  
 
  • M. Steck, R. Hess, R. Joseph, S.A. Litvinov, B. Lorentz, U. Popp
    GSI, Darmstadt, Germany
  
  De­cel­er­a­tion of highly charged ions is an im­por­tant mode for the op­er­a­tion of the ESR stor­age ring at GSI. Low en­ergy beams of highly charged heavy ions are ei­ther re­quired for in­ter­nal ex­per­i­ments or can be trans­ferred after fast ex­trac­tion to the low en­ergy stor­age ring CRYRING@​ESR or to the HI­TRAP fa­cil­ity, in both fa­cil­i­ties fur­ther de­cel­er­a­tion is pos­si­ble. In order to have high strip­ping ef­fi­ciency and suf­fi­cient pro­duc­tion rate for the high­est charge states and rare iso­tope beams sev­eral hun­dred MeV/u of beam en­ergy are re­quired. After pro­duc­tion of the highly charged ions in a strip­per foil or rare iso­tope beams in a thick tar­get the highly charged ions are in­jected into the ESR at an en­ergy of typ­i­cally 400 MeV/u. Con­sec­u­tively the ions can be de­cel­er­ated to a vari­able final en­ergy with a min­i­mum en­ergy of 3 MeV/u. The de­cel­er­a­tion process is sup­ported by ei­ther sto­chas­tic cool­ing at the in­jec­tion en­ergy or elec­tron cool­ing avail­able over the whole en­ergy range. The basic chal­lenges and fea­tures of beam de­cel­er­a­tion in the stor­age ring will be pre­sented.  
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