Münster 2011 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 45: Beschleuniger II

HK 45.7: Talk

Wednesday, March 23, 2011, 18:15–18:30, A-1

Toward Polarized Antiprotons — •Christian Weidemann — Institut für Kernphysik, Forschungszentrum Jülich, Jülich, Germany

The spin-filtering experiments at COSY and AD (-CERN) within the framework of the Polarized Antiproton EXperiments (PAX) are proposed to measure the polarization build-up of an initially unpolarized stored antiproton beam by multiple passage through an internal polarized gas target. Spin-filtering will first be done with protons at COSY in order to commission the experimental setup for the AD and understand machine parameters.
After the installation and commissioning of the low β-section in 2009, which is required to guide the proton beam through a storage cell target, the PAX target chamber together with the so-called Breit-Rabi polarimeter and the atomic beam source have been installed. In a recent beamtime in 2010 studies on beam lifetime limitations like intra-beam scattering and the electron-cooling performance as well as machine acceptance measurements have been realized. In addition the experimental setup such as the newly developed openable storage cell was commissioned. It provides target densities of 5× 10¹³atoms/cm² without substantial beam losses at injection.
The talk reports on the results of the studies and the progress toward spin-filtering experiments in 2011.