The time projection chamber(TPC)is capable of simultaneously measuring both time and position information,while the photolithographic micro-pattern gas detector,as the readout detector of TPC,can offers strong anti-interference,good uniformity,and high transmittance.In order to find the most suitable gas ratio as the working condition for the photolithographic micro-pattern gas detector of TPC,a 55Fe calibration source was used to measure the gain,energy resolution,and uniformity of the photolithographic micro-pattern gas detector independently developed by the laboratory under different Ar(argon)and CO2(carbon dioxide)ratios.According to the test results,the detector achieved its maximum gain of over 104 and gain uniformity of 3.26％in a gas mixture of 85％Ar and 15％CO2,with reaching the current international equivalent level.Furthermore,the photolithographic micro-pattern gas detector with avalanche zone thickness of 160 μm was identified as giving the optimal gain and uniformity after testing three avalanche zone thicknesses of 100 μm,160 μm,and 220 μm.A sealed micro-pattern gas detector has been developed,which demonstrated normal operability at room temperature and pressure for more than 21 days.The gain of the sealed micro-pattern gas detector is inversely correlated with temperature,which is opposite to that under flowing gas conditions.However,the energy resolution in both modes is not affected by small-scale temperature changes in the short term.
关键词
时间投影室/光刻一体化微结构探测器/气体比例/雪崩区厚度
Key words
time projection chamber/photolithographic micro-pattern gas detector/gas ratio/avalanche zone thickness
维普
万方数据