Dresden 2000 – scientific programme

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HK: Physik der Hadronen und Kerne

HK 13: Postersitzung / Instrumentation und Anwendungen

HK 13.48: Poster

Thursday, March 23, 2000, 10:15–12:45, B 117

An external polarimeter for COSY — •Andrea Wilms — Institut für Experimentalphysik I, Ruhr-Universität-Bochum

In December 1998, the COoler SYnchrotron COSY (Julic) extracted its first polarized proton-beam with a momentum of 797 MeV/c.

In order to control the polarization online an external polarimeter was designed and constructed at Bochum. The beam-polarization was measured by detecting the quasi-elastic scattered protons at the internal ¹²C -target of the polarimeter. This analyzing reaction allows to calculate the polarization by using the well-known maximum value of the analyzing-power A_y at ϑ = 10,5^∘ ( lab.) and the measured asymmetry ε of the recorded counting-rates.