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Development of a 2-dim. position-sensitive detector for high-energy x rays from SR

2-dim 的开发。

基本信息

批准号：
09559010
负责人：
ITO Shin
金额：
$ 6.66万
依托单位：
KYOTO UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1997
资助国家：
日本
起止时间：
1997 至 1999
项目状态：
已结题

项目摘要

Being based on the drift chamber principle, we have made basic and applied studies on the development of a 2-dim. position sensitive detector for high-energy x rays from the synchrotron radiation (SR). The specifications of the counter we have fabricated in this research are as follows: 1) A large sensitive volume of 110 x 100 x 24 mm ィイD13ィエD1 which is divided into two parts of 55 x 100 x 24 mmィイD13ィエD1. Each one has a maximum drift length of 55 mm, a sensitive area of 55 x 100 mm ィイD12ィエD1, and a sensitive depth of 24 mm. Total number of wires is 228. 2) The 24-mm depth is divided in two 12-mm thick layers in the one part and in four 6-mm thick layers in the other part, so that six separate detectors can be operated. This feature ensures high counting efficiency and high counting tolerance. The performance of the counter has been examined by using 6-keV x rays and 8-MeV protons. From the various studies on the energy response, we have confirmed that the loss of the primary electrons during the drift process can be ignored and as a result a fairly well potential distribution is realized in the drift regions. The observation of fast timing pulses with a digital oscilloscope allowed us to decide the use of 10-μm thick anode wires. The use of such a thin wire inevitably gives rise to unfamiliar electron avalanche mode peculiar in the region of the limited proportionality. In this connection, we have investigated this avalanche mode in the high-precision measurement of Tb Lx rays and have proved that the mode is quite feasible. From these studies above, we conclude that the position resolution less than 0.2 mm can be obtained for 20-40 keV x rays, and the realization of this new type detector based on the drift method is highly promising.

本文以漂移室原理为基础，对2-dim的研制进行了基础和应用研究。同步辐射（SR）高能x射线位置敏感探测器。本研究制作的计数器规格如下：1)110 × 100 × 24 mm的大敏感体积，分为55 × 100 × 24 mm的大敏感体积两部分。每个传感器的最大漂移长度为55mm，敏感面积为55 × 100mm，敏感深度为24mm。电线总数为228根。2)将24mm深度部分分为两个12mm厚的层，另一部分分为四个6mm厚的层，这样可以同时操作6个独立的探测器。该特性保证了高计数效率和高计数公差。用6 kev x射线和8 mev质子对计数器的性能进行了测试。从各种能量响应的研究中，我们已经证实，在漂移过程中，初级电子的损失可以忽略不计，从而在漂移区实现了相当好的电位分布。通过数字示波器对快速定时脉冲的观察，我们决定使用10 μm厚的阳极线。这种细线的使用不可避免地会产生在有限比例区域特有的不熟悉的电子雪崩模式。为此，我们在Tb Lx射线的高精度测量中研究了这种雪崩模式，并证明了该模式的可行性。通过以上研究，我们得出结论，对于20-40 keV的x射线，可以获得小于0.2 mm的位置分辨率，基于漂移法的新型探测器的实现是非常有前途的。