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

这个研究项目的意图在两个部分中;（i）开发一个新的数据采集系统，其中包括一组来自两个独立的两个维度位置敏感的检测器，用于它们之间的多重一致性分析，和（ii）衡量在电离过程中，在他原子受到电子影响的电离过程中发射了两个外电子的角度相关性。我们开发了两个-维度一致性数据采集系统已经过去了几年。该系统已成功地应用于多项实验。新开发的系统应用于2尺寸位置敏感探测器（PSD）。“该建筑在录音中发生了变化，PC平台正在经历多巧合实验的进展，该系统的主要特点如下。”在两个2个维度的PSDs之间收集一致性数据。列表模式方法（time-sequential raw data storage method）动态图形监视器功能。PC平台（Windows NT） base. 20纳秒的分辨率。高速率能力（最高至lOOkcps）.列表模式方法已在此系统中采用。来自探测器的原始数据完全记录在硬盘上。数据被分析，并在适当的兴趣区域内的信号一致性中得到了光谱（ROD同样地显示，包括电子枪、2维PSD等的实验设备，已经构建。在一致性测量中，它成功地被认为是分析实验数据的结果，在订购时，要获得关于两个输出电子的角度相关的信息，以便在目前达到目的时，它可以扭转未来的实验条件，这样可以减少意外一致性，需要改进。

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.