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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)建造时间投影室，时间投影室新建。由于氘气靶的成本很高，而且氘光致衰变产生的质子能量很低，导致停止范围很短，因此我们必须开发能够在低气压下工作的氘气室。因此，该室应抽真空到极高的真空，泄漏非常少。2）时间投影室的性能：通过使用α射线源研究时间投影室的性能，如下所述。2.1）带电粒子的检测效率：在以下条件下，效率大于99.5%。2.2）漂移速度，平均速度约为0.55（3）cm/μ s，与电场强度有关; 2.3）能量分辨率;对能量损失为67 keV的信号的分辨率为5.8%，脉冲高度与能量的线性关系良好。2.4）时间分辨率;时间分辨率为32纳秒，这对应于0.18 mm的z方向的位置分辨率。净化气体循环系统的构造：为了使时间投影室正常工作，应在没有由系统泄漏或系统排气引起的杂质气体的实验条件下使用。因此，我们构建了封闭的气体循环系统与气体净化设备，从而我们可以提供净化气体的腔室。因此，该室可以用于长期实验而没有任何问题。数据采集系统的构建：编制了数据采集程序。