Author: Droba, M.
Paper Title Page
TUPWO008 High-Current Beam Transport Simulations Including Gabor Lenses in Varying Non-Neutral Plasma States 1892
 
  • M. Droba, H. Dinter, O. Meusel, D. Noll, U. Ratzinger, K. Schulte
    IAP, Frankfurt am Main, Germany
  
  The Gabor space charge lens has the­o­ret­i­cally and ex­per­i­men­tally been in­ves­ti­gated at IAP for many years. Es­pe­cially the ap­pli­ca­tion in high cur­rent, Low En­ergy Beam Trans­port (LEBT) sec­tions seems ef­fi­cient and at­trac­tive. The fo­cus­ing prop­er­ties and imag­ing qual­ity of this lens type de­pend on the trans­verse and lon­gi­tu­di­nal con­fine­ment of the elec­tron col­umn. Dif­fer­ent non-neu­tral plasma states have been ob­served and cal­cu­lated. In gen­eral, they can be dis­turbed by the in­ter­ac­tion with ion beams. This re­sults in a shift and in a mod­i­fi­ca­tion of the work func­tion with a rise of aber­ra­tions and beam emit­tance growth. It is nec­es­sary to un­der­stand such processes for trans­port chan­nels using in­tense ion beams to pre­serve the high beam bril­liance. The beam trans­port sim­u­la­tions in­clud­ing Gabor lenses in var­i­ous non-neu­tral plasma states will be pre­sented and com­pared with ex­per­i­men­tal re­sults.  
 
THPWO021 Gabor Lens Performance Studies at the GSI High Current Test Injector 3806
 
  • K. Schulte, M. Droba, O. Meusel, U. Ratzinger
    IAP, Frankfurt am Main, Germany
  • A. Adonin, R. Berezov, R. Hollinger, J. Pfister
    GSI, Darmstadt, Germany
  
  At the In­sti­tute for Ap­plied Physics (IAP) the ap­pli­ca­tion of Gabor space charge lenses as a fo­cus­ing de­vice for low en­ergy ion beams has al­ready been stud­ied for sev­eral years. In­side Gabor lenses elec­trons are con­fined by ex­ter­nal fields. In case of a ho­mo­ge­neously dis­trib­uted elec­tron cloud the re­sult­ing lin­ear elec­tric space charge field en­ables the fo­cus­ing of high in­ten­sity heavy ion beams with­out aber­ra­tions. There­fore, the Gabor lens is a promis­ing ap­proach for mass-in­de­pen­dent fo­cus­ing and pos­si­ble space charge com­pen­sa­tion of ion beams. In mid-2012 the per­for­mance of a pro­to­type lens has suc­cess­fully been tested at the GSI High Cur­rent Test In­jec­tor (HOSTI). GSI and IAP are cur­rently in­ves­ti­gat­ing the pos­si­ble ap­pli­ca­tion of such a de­vice for the con­tin­u­ous op­er­a­tion at the High Cur­rent In­jec­tor (HSI) for FAIR. This con­tri­bu­tion will pre­sent the re­sults of beam trans­port ex­per­i­ments at HOSTI as well as the de­ter­mi­na­tion of re­lated plasma prop­er­ties.