A DEVELOPMENT OF X-RAY IMAGER AND POLARIMETER IN WIDE ENERGY RANGES BY GAS COUNTER WITH MICROCHANNEL PLATE

微通道板气体计数器宽能量范围X射线成像仪和旋光仪的研制

基本信息

批准号：
06640345
负责人：
SAKURAI Hirohisa
金额：
$ 1.34万
依托单位：
Yamagata University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1994
资助国家：
日本
起止时间：
1994 至 1995
项目状态：
已结题

项目摘要

We have developed a new type of gas proportional counter with the capability of fine position resolution and energy resolution by using a capillary plate, which is bi-product of a micro-channel plate. The capillary plate consists of a bundle of fine glass capillaries with electrodes on both the inlet and the outlet. The glass is lead glass and has higher resistivity, compared with the typical microchannel plates. The diameter and length of a capillary investigated are 100mum and 800mum, respectively. The diameter of the plate is effectively 20mm. The cappilary plate is installed in a vacuum tight gas chamber and is operated in gas by applying voltages between the inlet and the outlet. The fill gas was argon+5% methane at a pressure of latm.The characteristics of the capillary plate gas proportional counter (CGPC) were investifgated in using _<55>Fe 5.9keV X-rays. The resulting proportional counter was found to operate up to a gain of 10^4 without the onset of breakdown. The gas gain as the function of applied voltage and an analysis of Townsend ionization coefficient indicate that the electron multiplication of the CGPC is due to gas multiplication in each capillary. An energy resolution was 26% for 5.9keV X-rays at a gas gein of 7000. The escape peak in the energy of 2.9keV was clearly separated from the main peak. The gas gain of the CGPC was stable for long term operation over 10hours except during the first 15minutes after turning on the high voltages.An inportant point of the CGPC is that the gas multiplication occurs in each capillary and hence each part of the electron cloud entered in each capillary is identified in a very small domain. As an application of CGPC,we are available it to detect a X-ray in a capillary and a part of a electron cloud. We can envision development of a fine X-ray imaging detector and X-ray polarimeter from the results.

我们已经开发了一种新型的气体比例计数器，并通过使用毛细管板，具有精细位置分辨率和能量分辨率的能力，毛细管板是微通道板的培养基。毛细管板由一堆细玻璃毛细管组成，并在入口和出口上都有电极。与典型的微通道板相比，该玻璃是铅玻璃，具有更高的电阻率。研究的毛细管的直径和长度分别为100MUM和800MUM。板的直径实际上是20mm。核板安装在真空紧密的燃气室中，并通过在入口和出口之间施加电压在气体中操作。填充气是在拉长的压力下为氩气+5％甲烷。毛细管板气体比例计数器（CGPC）的特性用于使用_ <55> Fe 5.9Kev X射线。发现所得的比例计数器在没有崩溃的情况下运行至10^4的增益。气体增益作为施加电压的功能和汤森电离系数的分析表明，CGPC的电子乘法是由于每个毛细管中的气体乘积引起的。在7000的气体GEIN处的5.9keV X射线的能量分辨率为26％。2.9KeV的能量中的逃逸峰与主峰明显分离。 CGPC的气体增益在10小时内长期运行稳定，除非在打开高电压后的前15分钟内。CGPC的最重要点是，在每个毛细管中，气体乘积发生在每个毛细管中，因此在每个毛细管中输入的电子云的每个部分都在非常小的域名中识别出来。作为CGPC的应用，我们可以在毛细管中检测X射线和电子云的一部分。我们可以从结果中设想出精细的X射线成像检测器和X射线偏振仪的开发。