Berlin 2005 – wissenschaftliches Programm

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HK: Physik der Hadronen und Kerne

HK 29: Instrumentation und Anwendungen

HK 29.7: Vortrag

Dienstag, 8. März 2005, 15:30–15:45, TU MA042

Gold Finger-hydrogen/deuterium target for COSY-TOF experiment — •Salem Abdel-Samad, M. Abdel-Bary, K. Kilian, J. Ritman, and J. Uehlemann — Forschungszentrum Juelich, 52425 Juelich

A very small and light liquid hydrogen/deuterium target has been developed for pp and pd interaction studies at COSY. It is very 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 target has a long thin cooling finger, which was first made from copper, then aluminum and finally we now use extremely light heat pipes from thin stainless steel tube, 0.1 mm wall thickness. Isolation against heat radiation was done by very light aluminized Mylar foil (superisolation). In this work, a drastic reduction of the radiation heat load to the cold parts is achieved by coating the target finger and the heat pipe with a thin polished gold layer. Also the radiation heat load is reduced further from 1.4 Watt to 0.6 Watt on the actually used system by using an aluminum heat shield at   50 K around the cold parts at 15 K. This heat load will be reduced further without changing the geometry to less than 0.1 Watt by coating both sides of the aluminum shield with thin gold layer. The new results concerning the reduction of the heat load and the excellent performance during a six weeks beam time will be shown.