The development of gas-sealed type position-sensitive counter utilizing peculiar electron-avalanche mode

利用独特电子雪崩模式的气密式位敏计数器的研制

• 批准号: 06559009
• 负责人: ITO Shin
• 金额: $ 3.97万
• 依托单位: KYOTO UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (A)
• 财政年份: 1994
• 资助国家: 日本
• 起止时间: 1994 至 1996
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-06559009/
• 关键词: gas counter; one-dimensional position-sensitive counter; gas-sealed type; high-pressure counting gases; practical

In this research, we have made basic studies for the development of gas-sealed type position-sensitive counter utilizing peculiar electron-avalanche mode. Our achievements are as follows :(1) Operational mechanism and performance of high-preessure proportional counter in the region of limited proportionality (RLP) (a) Detailed analysis was performed for the halo effect due to characteristic X rays, and the response of proportional counter caused by this effect was fully explained. It was first found that, in RLP,the degree of gas amplification for the halo events is greater than that for the photo-peak events. From the practical view-point, this fact helps since a simple pulseheight selection is able to exclude the halo events which is known to deteriorate position resolution. The results are published in the article No. (1). (b) The feasibility of our position-sensitive proportional counter (PSPC) was examined in charged-particle accelerator experiment. The result showed that high-ene … More rgy (position) resolving power of the PSPC enables to analyze trace elements to be studied in PIXE.(the article No.(2)) (c) It was confimed that the sudden change of avalanche mode due to strutural change of primary-electron cloud exists in 7-atm Ar+30% CH_4. (the article No.(3)) (d) The performance of the PSPC for 10-60 KeV high-energy photon beams was tested in KEK Photon Factory. Fairly good position resolitions of 122mum (fwhm) for 20-keVX rays and 140mum for 35-keVX rays were obtained. A part of the results is given in the article No.(4). (e) Recently, high-resolution X-ray measurement using crystal spectrometer equipped with our PSPC was made by bombarding several targets with 6-MeV proton beams. The results reveled anomalous peak structures which clearly show many-body effect of atomic system. The elaborate analysis is being proceeded to publish paper as soon as possible.(2) Further improvement In this research project, we have completed to construct a newly improved PSPC,gas purification system to remove oxygen and water, and a gas mixing system to vary counting gases and mixing ratio. The gas systems are combined with oil-free turbo molecular pump. For Ar gas, relatively good performance was obtained when the gas is sealed in the PSPC.For Xe gas, however, it is needed to improve gas system especially the performance of the gas-purification system. Less

本研究为利用特有的电子雪崩模式研制气密式位敏计数器进行了基础研究。我们的研究成果如下：(1)有限比例区(RLP)高压正比计数器的工作机理和性能(a)对特征X射线产生的光晕效应进行了详细分析，充分解释了该效应引起的正比计数器的响应。首次发现RLP中光晕事件的气体放大程度大于光峰事件。从实际角度来看，这一事实很有帮助，因为简单的脉冲高度选择就能够排除已知会降低位置分辨率的光晕事件。结果发表在第（1）号文章中。 (b) 在带电粒子加速器实验中检验了我们的位置敏感正比计数器（PSPC）的可行性。结果表明，PSPC的高烯rgy（位置）分辨力能够分析PIXE中待研究的微量元素。（文章编号（2））（c）证实7-atm Ar+30% CH_4中存在由于一次电子云结构变化而导致的雪崩模式突变。 （第(3)条） (d) PSPC对于10-60 KeV高能光子束的性能在KEK光子工厂进行了测试。 20-keVX 射线的位置分辨率为 122mum (fwhm)，35-keVX 射线的位置分辨率为 140mum。第（4）号文章给出了部分结果。 (e) 最近，通过用 6 MeV 质子束轰击多个目标，使用配备了我们 PSPC 的晶体光谱仪进行了高分辨率 X 射线测量。结果揭示了异常的峰结构，清楚地显示了原子系统的多体效应。详细分析正在进行中，尽快发表论文。 (2)进一步改进 在本研究项目中，我们完成了新改进的PSPC、去除氧气和水的气体净化系统以及改变计数气体和混合比的气体混合系统。气体系统与无油涡轮分子泵相结合。对于Ar气，当气体密封在PSPC中时，获得了较好的性能。但是对于Xe气，需要改进气体系统，特别是气体净化系统的性能。较少的

项目成果

Shin Ito: "Characteristic Counter Response of Position-Sensitive Proportional Counter Filled with High-Pressure Counting Gases" KEK Photon Factory Activity Report. 1993. 429 (1994)

Shin Ito：“充满高压计数气体的位置敏感比例计数器的特征计数器响应”KEK Photon 工厂活动报告。

Shin Ito: "Development of Position-Sensitive Proportional Counter for High-Resolution X-Ray Measurement" Annual Report, Tandem V. D. G. Laboratory, Kyoto University. 1995. 28-33 (1996)

Shin Ito：“用于高分辨率 X 射线测量的位置敏感比例计数器的开发”年度报告，Tandem V.D.G. 实验室，京都大学。

Shin Ito: "Development of Position-Sensitive Proportional Counter for High-Resolution X-Ray Measurement" Activity Report of Tandem van de Graaff Accelerator 1995, Department of Physics, Faculty of Science, Kyoto University. (in press).

Shin Ito：“用于高分辨率 X 射线测量的位置敏感比例计数器的开发”1995 年 Tandem van de Graaff 加速器活动报告，京都大学理学院物理系。

Shin Ito: "Gas amplification of proportional and SQS modes observed as a function of the radial distance of the position fo primary ionization" Nucl. Instr. and Meth.A348. 297-302 (1994)

Shin Ito：“观察到的比例和 SQS 模式的气体放大作为初级电离位置的径向距离的函数”Nucl。

Shin Ito: "Development of Position-Sensitive Proportional Counter for High-Resolution X-Ray Measurement" Annual Report, Tandem V.D.G.Laboratory, Kyoto University. 1995. 28-33 (1996)

Shin Ito：“用于高分辨率 X 射线测量的位置敏感比例计数器的开发”年度报告，Tandem V.D.G. 实验室，京都大学。