Spin Filtering is the only experimentally demonstrated method which could lead to an intense beam of polarized antiprotons. The physics of spin filtering defines certain requirements to the storage ring, which have to be taken into account in the design of a dedicated spin filter ring. Spin filtering makes use of the repetitive interaction of circulating unpolarized particles with a polarized target in a storage cell. The polarization build up process for an antiproton beam is expected to be most effective around energies of 50 up to a few hundred MeV. The process makes use of the different scattering cross sections of particles with different polarization states, leading to different loss probabilities in the storage ring. In order to achieve a significantly high degree of polarization of the circulating ion beam with a reasonable intensity, the storage ring has to provide a long beam lifetime at a target thickness of a polarized target as high as possible. Depolarizing resonances have to be avoided to reach a long polarization lifetime.
LIFETIME STUDIES FOR POLARIZED AND UNPOLARIZED PROTONS IN COSY
LENISA, Paolo;STATERA, Marco;
2009
Abstract
Spin Filtering is the only experimentally demonstrated method which could lead to an intense beam of polarized antiprotons. The physics of spin filtering defines certain requirements to the storage ring, which have to be taken into account in the design of a dedicated spin filter ring. Spin filtering makes use of the repetitive interaction of circulating unpolarized particles with a polarized target in a storage cell. The polarization build up process for an antiproton beam is expected to be most effective around energies of 50 up to a few hundred MeV. The process makes use of the different scattering cross sections of particles with different polarization states, leading to different loss probabilities in the storage ring. In order to achieve a significantly high degree of polarization of the circulating ion beam with a reasonable intensity, the storage ring has to provide a long beam lifetime at a target thickness of a polarized target as high as possible. Depolarizing resonances have to be avoided to reach a long polarization lifetime.I documenti in SFERA sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
