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Study of Deterioration Resistive Plate Chamber

抗劣化板室的研究

基本信息

批准号：
11640288
负责人：
YUTA Haruo
金额：
$ 1.41万
依托单位：
AOMORI UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1999
资助国家：
日本
起止时间：
1999 至 2000
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-11640288/
关键词：
Resistive Plate Chamber RPC Particle Detector 粒子検出器

项目摘要

This research is to investigate deterioration properties of a resistive plate chamber. In particular, we investigate why the chamber gets not to work under the operation of (1) the mixing gas with a little vapor and (2) with large dark current. Up to now, no clear evident was reported for this deterioration of the chamber.One of the reasons why such a study was not performed was that the chamber was made of two resistive glass plates glued by hard bond. This breaks the glass plates when we want to open and see inside the chamber and made it difficult to investigate the deterioration.In this study, we made a new chamber which has two electrodes on the glass plate and can be opened without breaking the glass plates . To build such a chamber was possible by making the gas sealing with silicon grease and bolts. The plan is that the one side of the electrodes is operated with normal HV and the other is operated with destructive HV.When the one operated with destructive HV is dead, we open the chamber and compare both sides of the electrodes.Using the chamber built, we first tested the performance of the chamber with normal operational HV.The chamber worked with high detection efficiencies of 〜90% for both electrodes and the dark current was normal up to HV=4300V.However, the chamber got spark off and could not go up more than 4300V.Because of this trouble, we decided to open up the chamber and to investigate why the chamber sparks off. We will continue to investigate this research after fixing the chamber.

本研究旨在探讨阻性板室之劣化特性。特别地，我们研究了为什么在（1）混合气体与少量蒸汽和（2）大暗电流的操作下，腔室不能工作。到目前为止，还没有关于真空室性能恶化的明确证据，没有进行这种研究的原因之一是真空室是由两块电阻玻璃板通过硬粘合制成的。当我们想要打开并查看腔室内部时，玻璃板会被打破，因此很难调查恶化情况。在本研究中，我们制作了一种新的腔室，该腔室在玻璃板上有两个电极，可以在不打破玻璃板的情况下打开。通过用硅脂和螺栓进行气体密封，可以构建这样的腔室。方案是，电极的一侧用正常高压操作，另一侧用破坏性高压操作，当破坏性高压操作的一侧死亡时，我们打开腔室，比较电极的两侧，利用构建的腔室，我们首先在正常工作的高压下测试了电离室的性能，该电离室的探测效率高达90%以上两个电极的暗电流在HV= 4300 V时正常。但是，腔室产生火花，不能上升到4300 V以上。由于这个问题，我们决定打开腔室并调查腔室产生火花的原因。我们将在修复腔室后继续调查这项研究。