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HK: Physik der Hadronen und Kerne

HK 42: Instrumentation and Applications V

HK 42.2: Vortrag

Donnerstag, 14. März 2002, 14:30–14:45, F

New Developments in Cryo Targets for the External COSY Experiments — •S. Abdel-Samad, M. Abdel-Bary, and K. Kilian — Forschungszentrum Juelich

For pp and pd interaction studies at COSY a very light cryo target has been developed. The target thickness in beam direction defines the interaction probability and thus the statistical precision. However all material which can be hit by particles from the reaction under study will produce secondary scattering and unwanted background. Therefore already the target thickness has to be kept short. Much more important is to keep the transversal size of the target very small and the heat conductors, mounting elements and thermal isolation as light as possible. The Juelich cryo targets have been optimized over some years in this aspect. A drastic reduction of the total mass of the target arrangement was achieved by using very thin walled, small diameter heat pipes, by using aluminum for condensers, by target cells of galvanically deposited copper and by 0.9 µm Mylar windows. Up to 2 meter long heat pipes are operational. For bubble free operation a temperature stability with < 0.2 K fluctuation has to be achieved. Details of the targets will be shown.