Dresden 2013 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 49: Instrumentation

HK 49.6: Talk

Tuesday, March 5, 2013, 18:00–18:15, WIL-C207

Detector for polarized internal target experiments — •Christian Weidemann — Institut für Kernphysik, FZ-Jülich — University of Ferrara, Italy

The PAX collaboration is aiming to reveal the mystery of the proton spin and its interpretation in terms of its internal constituents. A multitude of findings, e.g. the transversity, which are accessible via p^→(bar)p^→ scattering experiments, led the Polarized Antiproton eXperiments (PAX) collaboration to propose such investigations at the High Energy Storage Ring (HESR) of the Facility for Antiproton and Ion Research (FAIR).
Already the production of intense polarized antiproton beams is still an unsolved problem. A dedicated experimental program with protons at the COSY storage ring in Jülich confirmed the validity of the spin-filtering method to polarize a stored beam. Subsequently, spin filtering has to be realized with antiprotons. The p^→(bar) beam polarization will be measured by elastic p^→(bar)p^→ scattering. For this purpose a φ-symmetric detection system based on 24 silicon microstrip detectors of different thickness, that allows the measurement of all spin observables, is under development. The operation close to the target region within the accelerator vacuum, demands for UHV capability and a dedicated cooling system. Its versatility is essential for additional experiments, such as the study of three nucleon continuum in proton deuteron breakup reactions or time reversal invariance tests at COSY.
The talk outlines the status of the detector development.