Darmstadt 2008 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 12: Instrumentation und Anwendungen II

HK 12.2: Vortrag

Montag, 10. März 2008, 17:00–17:15, 2D

Spin Filtering at COSY and AD — •Alexander Nass for the PAX collaboration — Physikalisches Institut der Universität Erlangen-Nürnberg, E.-Rommel-Str.1, 91058 Erlangen

The high physics potential of experiments with stored high-energy polarized antiprotons led to the proposal of PAX (Polarized Antiproton eXperiment) for the High Energy Storage Ring (HESR) of the FAIR at GSI (Darmstadt/Germany). It is proposed to polarize a stored antiproton beam by means of spin filtering with a polarized hydrogen (deuterium) gas target. The feasibility of spin filtering has been demonstrated in the FILTEX experiment. The theoretical understanding of the collision of an (anti)proton with a polarized hydrogen (deuterium) target is crucial for the success of the spin-filtering technique. However, there exist two competing theoretical interpretations: one with substantial filtering of (anti)protons by polarized electrons, while the second one suggests a self-cancellation of the electron contribution to filtering. In order to clarify this situation, several experimental studies with protons (at COSY/Jülich) as well as antiprotons (at AD/CERN) have to be carried out. These include the setup of a polarized internal gas target (PIT) immersed into a low-β section, as well as a Siberian snake for spin filtering with a longitudinal target polarization. In this talk the current status of the setup of the Polarized Internal Target including an Atomic Beam Source, the storage cell and a Breit-Rabi Polarimeter, is discussed. Furthermore, the design of the Silicon strip detectors and their incorporation into the target setup will be presented. This work is supported by BMBF: 06ER144.