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Persistent URL http://purl.org/net/epubs/work/33859
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Record Id 33859
Title A prototype 2-D GMSD based imaging detector for X-rays
Abstract The development and testing of a 2-D prototype detector based on a gas microstrip detector (GM SD) is reported. The second spatial co-ordinate is obtained by utilising a plane of orthogonal wires as pick up electrodes. The detector is operated with the wire plane at such a potential so as not to induce any gain around the wires. This means that the high tolerances normally associated with wire planes in Multi-W ire Proportional Counters are not necessary, making the manufacture and repair of such a device relatively easier. The detector com prises of 48 individually instrumented channels in both X (GM SD strips) and Y (transverse wire plane). A specially designed encoding module has been constructed which feeds digital addresses for each event to the ISIS data taking electronics system (DAE). An intrinsic detector resolution of ~0.5m m FW H M has been measured for both dimensions which is degraded slightly by the digital resolution for the overall system . This readout method is shown to be very tolerant of a poor signal to noise ratio in the readout channels (unlike traditional analogue wire chamber readout systems) and permits the operation of the GM SD at moderate avalanche gains (~1000). This helps to maximise the rate and lifetime performance of the detector as well as permitting data capture rates in the MHz range.
Organisation CCLRC
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Language English (EN)
Type Details URI(s) Local file(s) Year
Report RAL Technical Reports RAL-TR-2004-027. 2004. raltr-2004027.pdf 2004
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