• C. Montag
  BNL, Upton, Long Island, New York
• A. Jankowiak
  IKP, Mainz
• A. Lehrach
  FZJ, Jülich

To fa­cil­i­tate stud­ies of col­li­sions be­tween po­lar­ized elec­tron and pro­tons at √{s} = 14 GeV con­struct­ing an elec­tron-nu­cle­on col­lid­er at the FAIR fa­cil­i­ty has been pro­posed. This ma­chine would col­lide the stored 15 GeV po­lar­ized pro­ton beam in the HESR with a po­lar­ized 3.3 GeV elec­tron beam cir­cu­lat­ing in an ad­di­tion­al stor­age ring. We de­scribe the in­ter­ac­tion re­gion de­sign of this fa­cil­i­ty, which uti­lizes the PANDA de­tec­tor.

• D.M. Welsch, A. Lehrach, B. Lorentz, R. Maier, D. Prasuhn, R. Tölle
  FZJ, Jülich

The High-En­er­gy Stor­age Ring (HESR) is part of the up­com­ing Fa­cil­i­ty for An­tipro­ton and Ion Re­search (FAIR). The HESR will pro­vide an­tipro­tons in the mo­men­tum range from 1.5 to 15 GeV/c for the in­ter­nal tar­get ex­per­i­ment PANDA. The de­mand­ing re­quire­ments of PANDA in terms of beam qual­i­ty and lu­mi­nos­i­ty to­geth­er with a lim­it­ed pro­duc­tion rate of an­tipro­tons call for a long beam life time and a min­i­mum of beam loss. Thus, a suf­fi­cient­ly large dy­nam­ic aper­ture of the HESR is cru­cial. To pro­vide this, a chro­matic­i­ty cor­rec­tion scheme for the HESR has been de­vel­oped to re­duce tune spread and thus to min­i­mize the emit­tance growth caused by be­ta­tron res­o­nances. The chro­matic­i­ty cor­rec­tion scheme has been op­ti­mized through dy­nam­ic aper­ture cal­cu­la­tions. The es­ti­mat­ed field er­rors of the HESR dipole and quadrupole mag­nets have been in­clud­ed in the non-lin­ear beam dy­nam­ics stud­ies. The ion op­ti­cal set­tings of the HESR have been im­proved using dy­nam­ic aper­ture cal­cu­la­tions and fre­quen­cy map anal­y­sis tech­nique. In this pre­sen­ta­tion com­pre­hen­sive beam sim­u­la­tions are pre­sent­ed and pre­dic­tions of long-term sta­bil­i­ty based on short-term par­ti­cle track­ing and orbit dif­fu­sion dis­cussed.