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Peters, A.

Paper Title Page
MOPEA006 Operational Status and Further Enhancements of the HIT Accelerator Facility 73
 
  • A. Peters, R. Cee, E. Feldmeier, M. Galonska, Th. Haberer, K. Höppner, M.B. Ripert, S. Scheloske, C. Schömers, T. Winkelmann
    HIT, Heidelberg
  
 

Since Novem­ber, 15th 2009 pa­tients are treat­ed with pro­tons and car­bon ions at the Hei­del­berg Ion­beam Ther­a­py Cen­tre (HIT). The fa­cil­i­ty - two ion sources, an in­jec­tor linac and a com­pact syn­chrotron - is op­er­at­ed in 24/7-mode with high avail­abil­i­ty. The HIT beam time sched­ule is dis­cussed along the statis­tics au­to­mat­i­cal­ly gen­er­at­ed by the con­trol sys­tem. Be­sides the pa­tient treat­ment in the first hor­i­zon­tal room beam time is also used to de­vel­op en­hanced treat­ment soft­ware in the sec­ond hor­i­zon­tal room as well as for com­mis­sion­ing the gantry place. Ad­di­tion­al­ly, bio­physics stud­ies are served at a sep­a­rate ex­per­i­men­tal place. In par­al­lel, an up­grade pro­gram for the ac­cel­er­a­tor is under way: at first a test bench for a third ion source, later on ded­i­cat­ed to He beams, will be used to study sev­er­al ideas to in­crease the in­jec­tor per­for­mance. Fur­ther­more op­er­a­tion mech­a­nisms are under progress to con­trol di­rect­ly the syn­chrotron dipole and quadrupole fields as well as to reg­u­late the spill struc­ture - the aim of both de­vel­op­ments is to form a uni­form and ex­treme­ly sta­ble ex­tract­ed beam with high duty cycle. An overview on this en­tire ac­cel­er­a­tor R&D at HIT will be given.

  
MOPD004 Magnetic Field Correction in Normal Conducting Synchrotrons 675
 
  • E. Feldmeier, Th. Haberer, A. Peters, C. Schömers, R. Steiner
    HIT, Heidelberg
  
 

While ramp­ing the mag­nets in a syn­chrotron the mag­net­ic fields de­vi­ate from their set val­ues. Es­pe­cial­ly the field er­rors in dipole and quadrupole mag­nets re­sult in dif­fer­ent prob­lems dur­ing op­er­a­tion. At the Hei­del­berg Ion Ther­a­py Cen­ter HIT a mea­sur­ing sys­tem with ex­treme­ly high pre­ci­sion has been de­vel­oped. It can mea­sure in real time in­te­gral mag­net­ic fields with a pre­ci­sion of bet­ter than 5*10-5 in a re­pro­ducible way. A feed-back con­trol sys­tem for the mag­net­ic fields is being in­stalled and will be op­er­a­tional in May 2010. This con­trol loop lets the mag­nets reach the nom­i­nal field much faster and thus short­ens the dead time in a syn­chrotron cycle. The cycle can be re­duced by 30% and more pa­tients can be treat­ed.