MICROMEGAS探测器初步测试

介绍了一种利用鱼线做放大区间隔的MICROMEGAS探测器， 灵敏面积为50 mm ×50 mm。 在Ar+CO₂（10%）气体条件下， 利用55Fe源5.9 keV的 X射线对MICROMEGAS探测器进行了初步测试: 计数率大于103 Hz的条件下， 计数率坪长达到280 V； 当栅极电压在800 V时能量分辨为30%； 当增益高于104时打火率低于10-4； PCB板读出条周期为400 μm条件下的位置分辨好于120 μm。 结果表明， 研制的MICROMEGAS探测器达到了初步设计的基本要求。 In this paper，A MICROMEGAS(Micro Mesh Gaseous Structure) detector with the amplification gap defined by stretching nylon fishing lines has been described . And its count plateau， gas gain and energy resolution in the condition of a 55Fe X ray source and Ar CO₂ (10%) mixture gases are measured as functions of mesh voltage. The count plateau approaches 280 V at the count rate of 103 Hz. The discharge rate is less than 10－4 when the gas gain is up to 104. The energy resolution is 30% (FWHM) based on －800 V mesh voltage. The position resolution is less than 120 μm at the condition of the sensitive area (50 mm×50 mm) Printed Circuit Boards (PCB) and its strip pitch of 400 μm. The results can satisfy the basic demand of MICROMEGAS detector preliminary design.

Preliminary Test of MICROMEGAS Gaseous Detector

In this paper，A MICROMEGAS(Micro Mesh Gaseous Structure) detector with the amplification gap defined by stretching nylon fishing lines has been described . And its count plateau， gas gain and energy resolution in the condition of a 55Fe X ray source and Ar CO₂ (10%) mixture gases are measured as functions of mesh voltage. The count plateau approaches 280 V at the count rate of 103 Hz. The discharge rate is less than 10－4 when the gas gain is up to 104. The energy resolution is 30% (FWHM) based on －800 V mesh voltage. The position resolution is less than 120 μm at the condition of the sensitive area (50 mm×50 mm) Printed Circuit Boards (PCB) and its strip pitch of 400 μm. The results can satisfy the basic demand of MICROMEGAS detector preliminary design.