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Dresden 2000 – wissenschaftliches Programm

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HK: Physik der Hadronen und Kerne

HK 13: Postersitzung / Instrumentation und Anwendungen

HK 13.47: Poster

Donnerstag, 23. März 2000, 10:15–12:45, B 117

New Developments in the COSY Cryogenic Target System — •Salem Abd El-Samad, K. Kilian, R. Klein, and E. Roderburg — Institut für Kernphysik, FZ Jülich

A very light liquid hydrogen/deuterium target has been constructed and used in the external COSY experiments. The target cell is 6mm in diameter and 4mm long with very thin windows of 0.9µm Mylar foil. Early versions are described in NIM A349 (1994), 15 and 425 (1999), 403. A comparison between thermal conductivity and heat capacity of the three heat conductors (Cu, Al, Ag) was done. Resulting cool down times will be shown.
Recently, a gravity assisted heat pipe system has been developed with the target liquid as transport medium. The combination of heat pipe and thin target cell provides stable working conditions with minimum density variation and minimizes inactive materials to less than 10g in the 32cm long standard setup. These heat pipes with a nominal diameter of 16mm combined with the target cell are routinely used with H2/D2/CH4/N2. A comparison of the operating conditions with heat pipe and solid heat conductors will be shown. A heat pipe of 2m length and 16mm diameter is under development for future Time of Flight Spectrometer (TOF) experiments.

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