Application of the Compton backscattering laser light to study the nuclear astrophysics

应用康普顿后向散射激光研究核天体物理

基本信息

批准号：
07454048
负责人：
ASAHI Koichiro
金额：
$ 4.42万
依托单位：
TOKYO INSTITUTE OF TECHNOLOGY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1996
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07454048/
关键词：
deuteron photo-disintegration Compton backscattering of laser drift chamber meson exchange currents ciuculary polarized light angular distribution trajectory of charged particle

项目摘要

1) Construction of the time projection chamber.The time projection chamber was newly constructed. Since the deuteron gas target costs very much, and also the energy of the proton emitted from the deuteron photodisintegration is very low leading to the short stopping range, we had to develop the chamber, which can be operated at low pressure of the gas target. Therefore, the chamber should be evacuated up to the extremely high vacuum with very few leakage.2) Performance of the time projection chamber :the performance of the time projection chamber was studied by using the alpha-ray source as discussed below.2.1) Detection efficiency of the charged particle ;The efficiency was more than 99.5% under the following conditions of the chambar. Namely, the high voltages of the anode wire and field wire were +1500V and -2000V,respectively at the gas presure of 700 torr.2.2) Drift velocity ;The average velocity was about 0.55(3)cm/micro seconds, and it depends on the strength of the electric field.2.3) Energy resolution ;The resolution was 5.8% for the signal of the energy loss of 67 keV,and the linearity of the pulse height vs. the energy was quite good.2.4) Time resolution ;The time resolution was 32 nano-seconds, which corresponds to the position resolution of the z-direction of 0.18 mm.3). Construction of the purified gas circulating system :In order to operate the time projection chamber・properly it should be used in the experimental conditions free from the impurity gas, caused either by the leakage of the system or the out gas of the system. Therefore, we constructed the closed gas circulating system with the gas purified equipment, and thereby we can provide the purified gas to the chamber. Consequently, the chamber can be used for a long term experiment without having any problem.4). Construction of the data taking system :The data taking program was made.

1) 时间投影室的建造。时间投影室是新建的，由于氘核气体靶材成本很高，而且氘核光解离产生的质子能量很低，导致停止距离很短，所以我们设计了时间投影室。开发可以在气体靶的低压下运行的腔体，因此，腔体应抽真空至极高真空，并且泄漏极少。2）时间投影腔体的性能：时间投影的性能。室是2.1）带电粒子的探测效率；在以下腔室条件下，即阳极线和场线的高电压为+，效率大于99.5%。 1500V和-2000V，分别在气压700托下。2.2) 漂移速度；平均速度约为0.55(3)cm/μm秒，取决于电场的强度。2.3）能量分辨率；对于67 keV能量损失的信号，分辨率为5.8%，脉冲高度与能量的线性很好。2.4 ) 时间分辨率；时间分辨率为32纳秒，对应于z方向的位置分辨率为0.18毫米。3) 纯化气体循环系统的构建：为了操作时间投影。室・正确使用应在无杂质气体的实验条件下使用，无论是系统泄漏还是系统逸出气体，我们都采用气体净化设备构建了封闭的气体循环系统，从而实现了气体净化。可以向试验箱提供净化后的气体，试验箱可以长期使用，没有任何问题。4）数据采集系统的构建：制定了数据采集程序。