权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

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.

本文根据漂移室原理，对同步辐射高能X射线二维位置灵敏探测器的研制进行了基础和应用研究。本研究中所制作的计数器的规格如下：1）将110 × 100 × 24 mm的灵敏体积D_（13）D_（11）分成55 × 100 × 24 mm的两个部分。每一个都有55毫米的最大漂移长度，55 × 100毫米的灵敏面积D12 × D1，灵敏深度为24毫米。导线总数为228。2)24毫米的深度分为两个12毫米厚的层在一个部分和四个6毫米厚的层在另一部分，使六个独立的探测器可以操作。这一特性确保了高计数效率和高计数容限。计数器的性能已通过使用6-keV的X射线和8-MeV的质子进行了检查。从对能量响应的各种研究中，我们已经证实，在漂移过程中的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位分布。用数字示波器观察快速定时脉冲使我们能够决定使用10 μm厚的阳极线。使用这样的细导线不可避免地会引起不熟悉的电子雪崩模式特有的区域中的有限比例。在这方面，我们研究了这种雪崩模式在高精度测量的Tb Lx射线，并已证明，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的X射线，可以获得小于0.2mm的位置分辨率，并且基于漂移方法的这种新型探测器的实现是非常有前途的。