Darmstadt 2016 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 52: Instrumentation XIII
HK 52.1: Talk
Thursday, March 17, 2016, 14:00–14:15, S1/01 A3
Development of a thin, internal superconducting polarisation magnet for the Polarised Target — •Marcel Bornstein, Hartmut Dutz, Stefan Goertz, Scott Reeve, and Stefan Runkel — 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 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. A second build prototype passes first tests and looks promising to fulfil the particular requirements.