Nonlinear corrections in the CR storage ring at FAIR
Beam Dynamics and Optimization（2014）
摘要
The large acceptance Collector Ring at FAIR is designed to provide a stochastic pre-cooling of either antiprotons (Pbar) or Rare Isotopic Beams (RIB) injected in the ring. In addition, for mass measurement of exotic short-lived nuclides, the CR will be tuned in the special isochronous ion-optical setting, in which it will be used as a Time-Of-Flight (TOF) spectrometer. In order to reach necessary time resolution, the octupole corrector magnets will be installed in the CR. The nonlinear field imperfections of the magnets and fringing fields of the wide aperture quadrupole magnets excite high-order chromatic aberrations, which lead to the beam losses. This is especially important for the large momentum acceptance antiproton and RIB ion-optical modes. To improve the dynamic aperture and to reach necessary time resolution for TOF sextupole and octupole corrections are planned to be applied in the ring.
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关键词
aberrations,accelerator magnets,particle beam stability,proton beams,stochastic processes,storage rings,time of flight mass spectrometers,CR storage ring,FAIR,aperture quadrupole magnets,beam losses,dynamic aperture,exotic short-lived nuclides,fringing fields,high-order chromatic aberrations,isochronous ion-optical setting,large acceptance Collector Ring,large momentum acceptance antiproton,mass measurement,nonlinear corrections,nonlinear field imperfections,octupole corrector magnets,rare isotopic beam ion-optical modes,stochastic precooling,time resolution,time-of-flight octupole correction,time-of-flight sextupole correction,time-of-flight spectrometer
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