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首页> 外文会议>Conference on X-Ray and Gamma-Ray Instrumentation for Astronomy XI 2-4 August 2000 San Diego, USA >Dependence of Gas Gain on X-ray-absorbed Position in Proportional Counter
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Dependence of Gas Gain on X-ray-absorbed Position in Proportional Counter

机译：气体增益对比例计数器中X射线吸收位置的依赖性

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摘要

The position dependency of gas amplification in the proportional counter (PC) is investigated. We ahve been developing one-dimensional position sensitive PCs for MAXI/GSC and HETE/WXM and found that anomalous gas amplficiation occurs in a high bias voltage, even while the PC is still operated in the proportional region. This effect depends on the position where the X-ray is absorbed. Therefore it appears as a hard tail, a soft tail, or a broad peak in the traditional PC, depending on the shape of the gain curve across the cell. It degrades the apparent energy resolution. Especially, a position sensitive proportional counter (PSPC) is operated with rather high bias voltage to give higher positional resolution. We encounter the difficulty to achieve good position and energy resolutions at the same time. In this work, we have examined the anomalous gas amplification for various gas mixtures of Xe+CO_2, Ar+CO_2 and Ar+CH_4, for gas gain upto approx 20000, and for energies from 6 to 17 keV to understand the phenomena.
机译：研究了比例计数器（PC）中气体放大的位置依赖性。我们一直在开发用于MAXI / GSC和HETE / WXM的一维位置敏感型PC，并且发现即使PC仍在比例区域中工作，在高偏置电压下也会发生异常的气体放大现象。该效果取决于X射线被吸收的位置。因此，在传统PC中，它表现为硬尾，软尾或宽峰，这取决于整个单元的增益曲线的形状。它降低了视在能量分辨率。特别是，位置敏感比例计数器（PSPC）在相当高的偏置电压下工作，以提供更高的位置分辨率。我们遇到了同时获得良好位置和能量分辨率的困难。在这项工作中，我们检查了Xe + CO_2，Ar + CO_2和Ar + CH_4的各种气体混合物的异常气体放大率，高达20000的气体增益以及6至17 keV的能量，以了解这种现象。

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