Author: Maier, R.
Paper Title Page
WEPC066 High Order Non-linear Motion in Electrostatic Rings 2172
 
  • D. Zyuzin, R. Maier, Y. Senichev
    FZJ, Jülich, Germany
  
  The ad­van­tages of an elec­tro­stat­ic stor­age ring as com­pared to a mag­net­ic ring are ob­vi­ous from the point of view to search for the pro­ton elec­tric dipole mo­ment (pEDM). How­ev­er the mag­net­ic and elec­tro­stat­ic fields have the dif­fer­ent na­ture and, con­se­quent­ly, dif­fer­ent fea­tures. In par­tic­u­lar, par­ti­cles mov­ing in elec­tro­stat­ic field, can change their own ki­net­ic en­er­gy as elec­tri­cal field co­in­cides with the di­rec­tion of mo­tion, which is not so for the mag­net­ic field, where the force is al­ways per­pen­dic­u­lar to the di­rec­tion of mo­tion. The elec­tro­stat­ic rings found many ap­pli­ca­tions in the atom­ic physics and part­ly the beam dy­nam­ics has been al­ready in­ves­ti­gat­ed. How­ev­er in EDM ring some ad­di­tion­al spe­cif­ic fea­tures are added, which are con­sid­ered in this paper.  
 
WEPC067 The Spin Aberration of Polarized Beam in Electrostatic Rings 2175
 
  • Y. Senichev, A. Lehrach, R. Maier, D. Zyuzin
    FZJ, Jülich, Germany
  
  For a beam with nonze­ro trans­verse emit­tance and mo­men­tum spread pass­ing through an elec­tric field, for ex­am­ple an elec­tric fo­cus­ing lens or de­flec­tor, the ori­en­ta­tion of a spin vec­tor be­comes a func­tion of 6D ini­tial phase co­or­di­nates that leads to spin aber­ra­tions. We in­ves­ti­gate this pro­cess an­a­lyt­i­cal­ly and nu­mer­i­cal­ly.  
 
THPS003 Status of Stochastic Cooling Predictions at the HESR 3430
 
  • H. Stockhorst, R. Maier, D. Prasuhn, R. Stassen
    FZJ, Jülich, Germany
  • T. Katayama
    GSI, Darmstadt, Germany
  
  De­tailed the­o­ret­i­cal stud­ies of stochas­tic cool­ing have been per­formed in order to ful­fil the re­quire­ments for in­ter­nal tar­get ex­per­i­ments at the High-En­er­gy Stor­age Ring (HESR) of the fu­ture Fa­cil­i­ty for An­tipro­ton and Ion Re­search (FAIR) at the GSI in Darm­stadt. A Fokker-Planck model and a par­ti­cle track­ing code uti­liz­ing the Fil­ter and time-of-flight mo­men­tum cool­ing method have been de­vel­oped for the 2 to 4 GHz cool­ing sys­tem. A bar­ri­er buck­et cav­i­ty is in­clud­ed to com­pen­sate the mean en­er­gy loss due to the beam-tar­get in­ter­ac­tion. The code has been ex­per­i­men­tal­ly ver­i­fied at the cool­er syn­chrotron COSY. Since the RESR ac­cu­mu­la­tor ring is post­poned in the mod­u­lar­ized start ver­sion of FAIR it is pro­posed to in­clude the an­ti-pro­ton ac­cu­mu­la­tion func­tion in the HESR down­stream of the Col­lec­tor Ring. Ap­ply­ing the ra­di­al stack­ing scheme well es­tab­lished at CERN and FNAL would re­sult in a com­plete­ly new and ad­di­tion­al cool­ing sys­tem in the HESR. In­stead a dif­fer­ent way of beam ac­cu­mu­la­tion has been se­lect­ed that uses the al­ready de­signed stochas­tic cool­ing sys­tem and the bar­ri­er buck­et cav­i­ty of the HESR. Sim­u­la­tion re­sults of the an­ti-pro­ton ac­cu­mu­la­tion in the HESR are pre­sent­ed.