A Transition Radiation Detector for AMS
For cosmic particle spectroscopy on the International Space Station the AMS experiment will be equipped with a Transition Radiation Detector to improve proton background supression up to 300 GeV. The TRD has 20 layers of fleece radiator with Xe/CO2 proportional-mode straw-tube chambers. They are supported in a conically shaped octagon structure made of CFC-Al-honeycomb. For low power consumption VA analog multiplexers are used as front-end readout. A 20 layer prototype has achieved proton rejections above 100 at 90% electron efficiency for beam energies up to 250 GeV. The detector is under construction at RWTH Aachen, the gas system will be built at MIT, slow-control and DAQ at TH Karlsruhe.
Siedenburg, T; Chung, CH; Fopp, S; Fernández García, M; Karpinski, W; Kirn, T; Lübelsmeyer, K; Orboeck, J; Schael, S; Schultz von Dratzig, A; Schwering, G; Siedling, R; Wallraff, W; Becker, U; Berges, P; Burger, J; Fischer, P; Henning, R; Kounine, A; Koutsenko, V; Scholberg, K; de Boer, W; Hauler, F; Jungermann, L
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