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

Development of a photon detector using capillary plates

使用毛细管板的光子探测器的开发

基本信息

批准号：
14340083
负责人：
SUMIYOSHI Takayuki
金额：
$ 8.19万
依托单位：
Tokyo Metropolitan University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2002
资助国家：
日本
起止时间：
2002 至 2004
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-14340083/
关键词：
photo-sensor capillary plates gas amplification 素粒子実験物理学光検出器

项目摘要

It was found in a resent research that the resistance of the capillary plates can be adjusted by change the degrees of deoxidization of the lead glass, and the diameter and the thickness of the capillary plates. After the adjustment of these parameters a big gas gain was obtained with the capillary plates. It was found that a quantum efficiency of the K-Cs photocathode placed in an argon+methane gas which is used in actual MWPC was very stable (about 15%) during a few days measurement. It was also true for an argon+CF4 gas.On the other hand, it was pointed out that a degradation of the photocathode may happen due to an ion feedback during a gas amplification process. In order to overcome this problem we have introduced a capillary plates with a bias angle. Choosing an appropriate bias angle, we can make such that only electron passes the capillary holes while the ion can not, since in the space where an electric field and a magnetic field were applied vertically each other, the Lorentz … More angles differ for the electrons and the ions. When examining the effect actually, it found that the ion feedback was excellently restrained. This result was already reported in an international conference in Vienna.In the recent work it was found that a stable high gain operation is possible in a gas chamber combined with capillary plates and Micromegas detector. We actually manufactured this type gas chamber and coupled with a transparent type K-Cs photocathode. We tried to observe visible light by using this gas chamber, however, we could not see any signals. We can explain this failure in such a way that the alkali metals used for the photocathode have reacted with the lead glass in the capillary and it changes the resistance of capillary plates. Therefore we removed the capillary plates from the chamber and tried with only Micromegas. Then we succeeded in observing a clear signal of gamma rays from a 137Cs source using NaI scintillator for the first time in the world. We reported this result, too, in the international conference.We are continuing this study by changes the material of capillary plates into the soda glass from the lead glass and plan to do a test. Less

研究发现，通过改变铅玻璃的脱氧程度、毛细管板的直径和厚度，可以调节毛细管板的电阻。调整这些参数后，用毛细管板获得了大的气体增益。发现在几天的测量期间，放置在实际MWPC中使用的氩气+甲烷气体中的K-Cs光电阴极的量子效率非常稳定（约15%）。另一方面，指出在气体放大过程中，由于离子反馈，光阴极可能发生退化。为了克服这个问题，我们引入了一种具有偏置角的毛细管板。选择一个适当的偏置角，我们可以使只有电子通过毛细孔，而离子不能通过，因为在电场和磁场相互垂直的空间中， ...更多信息电子和离子的角度不同。当实际检验该效果时，发现离子反馈被很好地抑制。这一结果已在维也纳的一次国际会议上作了报告。在最近的工作中，人们发现，在一个与毛细管板和Micromegas探测器相结合的气室中，稳定的高增益操作是可能的。我们实际上制造了这种类型的气体室，并与透明型K-Cs光阴极耦合。我们试图通过使用这个气体室来观察可见光，然而，我们看不到任何信号。我们可以用这样一种方式来解释这种故障，即用于光电阴极的碱金属与毛细管中的铅玻璃发生反应，改变了毛细管板的电阻。因此，我们将毛细管板从腔室中取出，并仅使用Micromegas进行尝试。在此基础上，我们在世界上首次用NaI闪烁体成功地观测到了清晰的137 Cs源γ射线信号。我们也在国际会议上报告了这一结果，我们正在继续这项研究，将毛细管板的材料从铅玻璃改为钠玻璃，并计划进行测试。少