GEM-MSTPC : An active-target type detector in low-pressure He/CO2 mixed gas
GEM-MSTPC : An active-target type detector in low-pressure He/CO2 mixed gas
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GEM-MSTPC：低压He/CO2混合气体中的主动目标型探测器
DOI：
10.1088/1748-0221/7/03/c03036
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发表时间：
2012
期刊：
影响因子：
--
通讯作者：
et al
中科院分区：
文献类型：
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作者：
H.Ishiyama;et al
我们开发了一种使用低压He/CO2（10%）检测气体的主动靶型气体计数器，用于研究使用放射性核束（RNB）的低能核反应。采用厚度为400 μ m的气体电子倍增器（THGEM）作为正比计数管，实现了高注入速率的能力。我们研究了气体增益的稳定性和离子反馈粒子轨道上的影响，在高光束注入速率高达10 5粒子每秒（pps）使用低能量12 C束。通过对THGEM的改进，在12 C注入速率为几百pps时测量的输出信号的相对脉冲高度的偏移在10 - 5 pps的速率下改善到2%以内。离子反馈引起的位置失真被抑制到1.5 mm以内，因为相对较高的漂移场值为1 kV/cm-3 atm，并使用了双GEM配置。THGEM被认为是适用于我们的活性靶在高达10 - 5 pps的高注射速率。
We developed an active-target type gas counter operating with low pressure He/CO 2 (10%) detector gas for application in studying low-energy nuclear reactions using radioactive nuclear beams (RNBs). A 400-μm-thick gas electron multiplier (THGEM) was used as the proportional counter for high injection rate capability. We examined the gas gain stability and the influence of ion feedback on particle tracks at high beam injection rates of up to 10 5 particles per second (pps) using a low-energy 12 C beam. By means of modifications to the THGEM, the shift in the relative pulse height of the output signal normalized to that measured at the 12 C injection rate of several hundred pps improved to within 2% at the rate of 10 5 pps. The position distortion induced by ion feedback was suppressed to within 1.5 mm because of the relatively high drift field value of 1 kV/cm⋅ atm and the use of the double GEM configuration. The THGEM was found to be applicable for our active target at high injection rates of up to 10 5 pps.