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GPM based on THGEM has shown its competitive strength compared to the conventional PMT,especially in the low background research such as dark matter detection.A kind of THGEM made from PTFE,named PTFE-THGEM,is developed for the GPM to be used in CDEX.The PTFE has a lot of advantages especially its low level radioactivity.The PTFE-THGEM was tested at room and cryogenic temperature.It has a high gain in diferent gases and shows good stability at room temperature.The gain of a single PTFE-THGEM reached 112 at 117 K.The penning efect is also discussed in this paper to explain the abnormal phenomena of the gain in diferent gases.
GPM based on THGEM has shown its competitive strength compared to the conventional PMT, especially in the low background research such as dark matter detection. A kind of THGEM made from PTFE, named PTFE-THGEM, is developed for the GPM to be used in CDEX The PTFE has a lot of advantages especially its low level radioactivity. The PTFE-THGEM was tested at room and cryogenic temperatures. It has a high gain in diferent gases and shows good stability at room temperature. The gain of a single PTFE-THGEM reached 112 at 117 K.The penning efect is also discussed in this paper to explain the abnormal phenomena of the gain in diferent gases.