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Heidelberg 2015 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 42: Instrumentation 14

HK 42.5: Talk

Wednesday, March 25, 2015, 15:30–15:45, M/HS2

Development of an thin, internal superconducting polarisation magnet for the Polarised TargetTimo Altfelde, •Marcel Bornstein, Hartmut Dutz, Stefan Goertz, Roland Miebach, Scott Reeve, Stefan Runkel, Marco Sommer, and Benjamin Streit — Physikalisches Institut, Bonn, Germany

In order to improve the figure of merit of double-polarisation experiments at CB-ELSA in Bonn, the Polarised Target is working on a new dilution refrigerator. For maximum polarisation of nucleons low temperatures and a high homogeneous magnetic field within the target area is needed. A thin, superconducting magnet is in development, which will create a continuous longitudinal magnetic field of 2.5 T and which will be used within the new refrigerator. The solenoidal geometry of this magnet uses two additional correction coils, placed at a well defined calculated position, for reaching the homogeneity criteria of 10−4 needed for the dynamic nuclear polarisation process. Practically, the superconducting wires as well as the correction coils have to be placed with maximum precision: Small fluctuations of the distance between the current loops can diminish the requested homogeneity.

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