Tungsten Alloy in Alpha Magnetic Spectrometer

The Alpha Magnetic Spectrometer (AMS-02) is a large experiment in the International Space Station (ISS) intended to measure primary cosmic ray spectra in space. It sits outside of the station, looking out into space. High-energy particles pass through it, interacting with different detectors on the way.

AMS-02 Transition Radiation Detector (TRD) consists of 20 layers of straw proportional tubes alternating with layer of fiber fleece radiator. The layers are mounted in a stable and light carbon fiber composite honeycomb octagonal support, fixed by an M-structure to the AMS-02 magnet flange. The entire TRD is composed by 328 modules, ranging in length from 1.5 meters up to 2.2, for a total of 5248 straw tungsten alloy tubes. The tube wall is composed of a 72 μm tungsten alloy thick foil and the tungsten alloy sense wires are 30 μm . The tungsten alloy wires are held by the polycarbonate end pieces crimped in Copper-Tellurium blocks.

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