Angular correlation measurement of emitted electrons from e-He collision using multi-dimensional coincidence method

使用多维重合法测量电子氦碰撞发射电子的角相关测量

• 批准号: 08640513
• 负责人: YOSHINO Masuhiro
• 金额: $ 1.41万
• 依托单位: Shibaura Institute of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1996
• 资助国家: 日本
• 起止时间: 1996 至 1997
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08640513/
• 关键词: multi-dimensional; coincidence measurement; position sensitive detector; electron impact; ionization process; data acquisition system; コインシデンス法; 2次元検出器; 電子衝突; 角度相関

The purpose of this research project consists in two parts ; i) to develop a new data acquisition system which records a set of signals from two independent two-dimensional position sensitive detectors for a multiple coincidence analysis between them, and ii) to measure the angular correlation of two out-going electrons emitted in the ionization process of He atom by electron impact.We developed a two-dimensional coincidence data acquisition system several years ago. The system was successfully applied to several experiments. The newly developed system applies to the 2-dimensional position sensitive detector (PSD). The architecture has been changed in accordance with progress of PC platform being attained a multi-coincidence experiments.The main features of the system are as follows.・Coincidence data acquisition between two 2-dimensional PSDs.・List mode method (time-sequential raw data storage method).・Dynamic graphic monitor function.・PC platform (Windows NT) base.・20ns time resolution.・High count rate capability (up to lOOkcps).The list mode method was adopted in this system. The raw data from the detectors are fully recorded in a hard disk. The data are analyzed and the spectrum in coincidence with the signals in appropriate regions of interest (ROD is simultaneously displayed.The experimental apparatus which include an electron gun, 2-dimensional PSD etc, has been constructed. Although it succeeded in coincidence measurement as a result of analyzing experimental data, in order to obtain the information about the angular correlation of two outgoing electrons made into the purpose at present, it turns out that the future experimental condition, such as removal of accidental coincidence, need to be improved.

本研究项目的目的包括两个部分；i)开发了一种新的数据采集系统，该系统记录了两个独立的二维位置敏感探测器的一组信号，并进行了它们之间的多重符合分析；ii)测量了He原子在电子碰撞电离过程中发射的两个出射电子的角相关性。几年前，我们开发了一个二维巧合数据采集系统。该系统已成功地应用于若干实验中。该系统适用于二维位置敏感探测器（PSD）。根据PC平台的发展，对系统结构进行了相应的调整。系统的主要特点如下：·两个二维psd之间的重合数据采集。·列表模式方法（时间顺序原始数据存储方法）。·动态图形监控功能。·PC平台（Windows NT）基础。·20ns时间分辨率。·高计数率能力（高达lOOkcps）。本系统采用列表模式方法。探测器的原始数据全部记录在硬盘上。对数据进行分析，并同时显示与相应感兴趣区域（ROD）信号相符的频谱。搭建了包括电子枪、二维PSD等在内的实验装置。虽然通过对实验数据的分析，实现了符合测量的成功，但为了获得目前所达成目的的两个出射电子的角相关信息，未来的实验条件，如去除偶然的符合，还需要改进。

项目成果

H.Shiromaru: "An apparatus for position sensitive TOF measure-ment of fragment ions produced by Coulomb explosion" Physica Scripta. T73. 407-409 (1997)

H.Shiromaru：“库仑爆炸产生的碎片离子的位置敏感 TOF 测量装置”Physica Scripta。

T.Mizokawa: "A Two-dimesional position sensitive anode for micro-chaunel plates based on “MBWC" Technique" Nuclear Instrm.& Metho.Phys.Res.A387. 395-400 (1997)

T. Mizokawa：“基于“MBWC”技术的微通道板二维位置敏感阳极”Nuclear Instrm.& Metho.Phys.Res.A387 (1997)。

W.Wu: "Rapid and precise method to convert a two dimensional image from Cartesian to polar coordinate system" Rev.Sci.Instrum.68(9). 3490-3493 (1997)

W.Wu：“将二维图像从笛卡尔坐标系转换为极坐标系的快速精确方法”Rev.Sci.Instrum.68(9)。

H.Shiromaru: "An apparatus for position sensitive TOF measurements of fragment ions produced by Coulomb explosion" Physica Scripta. T73. 407-409 (1997)

H.Shiromaru：“一种对库仑爆炸产生的碎片离子进行位置敏感 TOF 测量的装置”Physica Scripta。

Y.Kato: "A two dimensional electron analyzer for electron-ion collisions" Physica Scripta. T73. 405-406 (1997)

Y.Kato：“用于电子-离子碰撞的二维电子分析仪”Physica Scripta。