Köln 2004 – wissenschaftliches Programm
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HK: Physik der Hadronen und Kerne
HK 12: Poster Session: Instrumentation and Applications
HK 12.34: Poster
Dienstag, 9. März 2004, 13:30–15:30, Foyer
Beam-induced Depolarisation in the HERMES Transversely Polarised Hydrogen Target * — •Phil Tait, Davide Reggiani, and Erhard Steffens — Physikalisches Institut, Universität Erlangen-Nürnberg
The Hermes polarised Hydrogen target is situated in the HERA electron storage ring in Hamburg. For the transverse spin program at HERMES, the magnetic holding field of the target is perpendicular to the Hera positron beam. An unwanted consequence is that the beam-induced resonance between Hydrogen hyperfine states with Δ mF = 0, which was previously forbidden, can occur. The shape and spacing of these resonances will be shown. In order to prevent these resonances from reducing the nuclear polarisation in the target cell, an additional coil has been added to improve the field homogeneity. The success of these measures will be demonstrated.
*) Supported by BMBF, project 06-ER-127