The AMS-02 TRD for the International Space Station

Details The AMS-02 TRD for the International Space Station The AMS-02 TRD for the International Space Station

Jul 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003icrc....4.2161b&link_type=abstract

Proceedings of the 28th International Cosmic Ray Conference. July 31-August 7, 2003. Trukuba, Japan. Under the auspices of the I

Physics

Scientific paper

The Alpha Magnetic spectrometer (AMS-02) is an experiment which will be mounted on the International Space Station (ISS) to measure primary cosmic ray spectra in space. A key element is a Transition Radiation Detector (TRD) to distinguish an e+ or p- signal reducing the p+ or e- background by a rejection factor 10-3 - 10-2 in an energy range from 10-300 GeV. This will be used in conjunction with an electromagnetic calorimeter to provide overall p+ rejection of 10-6 at 90% e+ efficiency. The detector consists of 20 layers of 6 mm diameter straw tubes alternating with 20 mm layers of polyethylene/p olypropylene fleece radiator. The tubes are filled with a 80%:20% mixture of Xe : CO2 at 1.0 bar absolute from a recirculating gas system designed to operate >3 years in space. The layers are mounted to 0.1 mm precision in a stable carbon fiber composite/aluminum honeycomb o ctagonal mechanical support. The upper and lower four layers of tubes run in the x direction and the central layers run in the perpendicular y direction, to provide tracking in the bending and non-b ending directions of the 0.8 T superconducting magnet as well as particle identification. The construction of the detector will be presented.

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