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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.

基于漂移室原理，我们对2维器件的研制进行了基础和应用研究。位置敏感探测器，用于检测来自同步加速器辐射 (SR) 的高能 X 射线。我们在本研究中制作的计数器的规格如下： 1）110 x 100 x 24 mm ィイD13ィエD1 的大敏感体积，分为 55 x 100 x 24 mm ィイD13ィエD1 的两个部分。每一个的最大漂移长度为 55 毫米，敏感区域为 55 x 100 毫米ィイD12ィエD1，敏感深度为 24 毫米。导线总数为 228 根。 2) 24 毫米深度在一个部分分为两个 12 毫米厚的层，在另一部分分为四个 6 毫米厚的层，以便可以操作六个单独的探测器。这一特性保证了高计数效率和高计数容差。计数器的性能已使用 6-keV X 射线和 8-MeV 质子进行了检查。通过对能量响应的各种研究，我们已经证实漂移过程中初级电子的损失可以忽略不计，因此在漂移区实现了相当好的电势分布。通过数字示波器观察快速定时脉冲，我们决定使用 10 μm 厚的阳极线。使用如此细的导线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，并证明了该模式是相当可行的。通过以上研究，我们得出结论，对于20-40 keV X射线可以获得小于0.2 mm的位置分辨率，这种基于漂移方法的新型探测器的实现是非常有前景的。