Bochum 1998 – scientific programme
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HK: Hadronen und Kerne
HK 3: Instrumentation I, Ion Sources, Targets
HK 3.5: Talk
Monday, March 16, 1998, 15:15–15:30, A
The Polarized Atomic Beam Target for the EDDA Experiment at COSY* — •P.D. Eversheim1, M. Altmeier1, O. Felden1, M. Glende1, and R. Gebel2 — 1Institut f"ur Strahlen- und Kernhysik, Universit"at Bonn, Nussallee 14-16, D-53115 Bonn — 2Institut f"ur Kernphysik, Forschungszentrum J"ulich, D-52425 J"ulich
For the EDDA Experiment, measuring excitation functions of spin observables in
the energy range of 0.5 - 2.5 GeV, an polarized atomic-beam target (ABT) has been
built and set to operaton. The target comprises an atomic beam part, which is
essentially identical to the one of the polarized ion-source of COSY (COSY-CBS),
and a beam-dump.
In contrast to the atomic-beam part of the COSY-CBS, which has electrically
driven 6-pole magnets, the 6-pole magnets of the ABT are made out of permanent
magnets. The modular concept of the target allows to provide all possible proton
and deuteron polarizations. In addition, the ABT can be optimized for maximum
intensity rather than density, in case a the ABT is equipped with a taget-cell.
At present the polarization is controlled via the EDDA detector and a simple
version of a Breit-Rabi polarimeter in the beam-dump. Improved accuracy can be
expected as soon as this polarimeter is replaced by a Spin-filter.
First tests of the target have been performed with the EDDA detector. The results
agree well with expectations based on computer simulations of the ABT. The
performance of the ABT and further improvements are discussed.
* supported by the BMBF, Germany