MICROMEGAS探测器初步测试

鲁辰桂; 段利敏; #; 杨贺润; 马朋; 唐述文; 耿朋; 胡荣江; 张金霞; 李祖玉

doi:10.11804/NuclPhysRev.28.01.068

MICROMEGAS探测器初步测试

Preliminary Test of MICROMEGAS Gaseous Detector

摘要

摘要: 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.

Abstract: 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.

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