The structure of micromegas （micro-mesh gaseous structure） detectors with different micro-meshes of stainless steel wire woven netting and Ni foil has been presented. The counting rates, energy resolution, gain, dis...The structure of micromegas （micro-mesh gaseous structure） detectors with different micro-meshes of stainless steel wire woven netting and Ni foil has been presented. The counting rates, energy resolution, gain, discharge probability and time resolution have been measured. Wider counter plateaus and gain for the developed detector were obtained. Excellent energy resolution of the micromegas detector, 17% （FWHM） based on Ni foil micro-mesh and 25% （FWHM） based on stainless steel wire woven netting micro-mesh, has been obtained for the 5.9 keV photon peak of the 55Fe X-ray source in an At/CO2（10%） gas mixture. The best time resolution at -620 V micro-mesh voltage and -870 V drift voltage is 14.8 ns for cosmic rays in an Ar/CO2 （10%） gas mixture. These results satisfy the basic demand of the micromegas detector preliminary design.展开更多
基金Supported by National Natural Science Foundation of China (10575046,10775062)Program for New Century Excellent Talents in University
文摘The structure of micromegas （micro-mesh gaseous structure） detectors with different micro-meshes of stainless steel wire woven netting and Ni foil has been presented. The counting rates, energy resolution, gain, discharge probability and time resolution have been measured. Wider counter plateaus and gain for the developed detector were obtained. Excellent energy resolution of the micromegas detector, 17% （FWHM） based on Ni foil micro-mesh and 25% （FWHM） based on stainless steel wire woven netting micro-mesh, has been obtained for the 5.9 keV photon peak of the 55Fe X-ray source in an At/CO2（10%） gas mixture. The best time resolution at -620 V micro-mesh voltage and -870 V drift voltage is 14.8 ns for cosmic rays in an Ar/CO2 （10%） gas mixture. These results satisfy the basic demand of the micromegas detector preliminary design.
