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HK: Hadronen und Kerne

HK 25: Instrumentation III, Accelerators

HK 25.4: Vortrag

Dienstag, 17. März 1998, 15:00–15:15, A

Polarized Protons at COSY — •Andreas Lehrach — Institut fuer Kernphysik, Forschungszentrum Juelich, Postfach 1913, 52425 Juelich

The COoler SYnchrotron COSY at the Forschungszentrum Jülich accelerates protons to momenta between 600 and 3400 MeV/c.
In addition a polarized beam can be produced und injected. A polarized ion source, developed by a collaboration of the universities Bonn, Cologne and Erlangen is in operation. During acceleration in COSY imperfection and intrinic resonances can depolarize the beam. In 1996 we have accelerated the polarized beam to 2000 MeV/c for the first time. After the commissioning of a tune jumping system in 1997 we are able to preserve the polarization at strong depolarizing intrinsic resonances and accelerate the beam to maximum energy.
The correction of depolarizing resonances at COSY is discussed and calculations for a Siberian Snake to deliver longitudinal polarization to internal experiments are presented.