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Persistent URL http://purl.org/net/epubs/work/33860
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Record Id 33860
Title A prototype 2-D GMSD based imaging detector for neutrons
Abstract The development and testing of a 2-D prototype imaging neutron detector based on a Gas Microstrip Detector (GM SD) is reported using a gas mixture of 2.5bar 3He and 2.5bar CF4. The second spatial co-ordinate is obtained by utilising a plane of wires (orthogonal to the strips) 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 mandatory. The detector comprises of 48 individually instrumented channels in both X (GMSD 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 ~1mm FW HM has been measured for both dimensions (in experimental exposures on the ROTAX beam line at ISIS) 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 GMSD at low avalanche gains (~10) which helps to maximise the rate and lifetime performance of the detector as well as permitting data capture rates in the MHz range. The event timing resolution is comfortably sub microsecond and is therefore suitable for applications on spallation neutron sources.
Organisation CCLRC
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Language English (EN)
Type Details URI(s) Local file(s) Year
Report RAL Technical Reports RAL-TR-2004-028. 2005. raltr-2004028.pdf 2005