Darmstadt 2008 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 46: Instrumentation und Anwendungen I

HK 46.2: Talk

Friday, March 14, 2008, 14:30–14:45, 2C

Lattice studies for the COSY and the AD rings — •Archil Garishvili for the PAX collaboration — Physikalisches Institut II, Erlangen, Germany

In order to provide polarized antiprotons, the polarization build-up by spin-dependent attenuation due to nuclear interaction (spin-filtering) must be studied. The goal of these investigations is to understand the physics of the spin-filtering process with stored protons at COSY, and to understand in particular which role polarized electrons play in the polarization buildup. Later on, the spin-dependence of the proton-antiproton interaction will be investigated at the Antiproton Decelerator ring (AD) of CERN. In order to carry out these investigations, a storage ring section has to be developed which minimizes the spin-independent losses due to Coulomb scattering. The Coulomb-loss cross section for the single Coulomb scattering at fixed energy and for given gases is proportional to one over acceptance angle squared. The acceptance angle depends on the ring acceptance and on the beta lattice function. Therefore, to achieve high acceptance angles, the beta functions at the target should be as small as possible. In order to realize this, the storage ring should contain a section section where the beta functions will be as small as possible. We decided to realize such a low-beta section with strong superconducting quadrupole magnets, in order to have a minimum length of the insertion. Results of lattice studies and requirements for the superconducting quadrupole magnets will be discussed in this presentation.