Basic Study on Reactor Measurement & Control System by Laser

反应堆测量基础研究

基本信息

批准号：
04402052
负责人：
NAKAZAWA Masaharu
金额：
$ 11.26万
依托单位：
University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (A)
财政年份：
1992
资助国家：
日本
起止时间：
1992 至 1994
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-04402052/
关键词：
Laser Nuclear Pumping Neutron Detector Reactor Instrument Spin Orientation Fiber Optics Reactor Control He-3 gas スピン偏極中性子計測 He-Neレーザー He-Ne-H_2レーザー He-Rb法光ポンピング法偏極中性子 He-3核

项目摘要

(1) Neutron Detection by LaserA new basic idea of this study is to apply nuclear pumping gas-laser including ^3He gas to a neutron detector. As the lasing gas, at first, He-Ne gas was tried, that was given up because its low neutron sensitivity due to low ^3He gas pressure of about 10 Torr to be laser. Then, He-Ne-Ar gas was selected because it can contain about 3 atom of ^3He gas when its lasing operation.Neutron irradiation experiments of ^3He-Ne-Ar gas cells were made using the research reactor of YAYOI (Univ.of Tokyo) and JRR-4 (JAERI). Simulation calculations on the lasing process of this gas under neutron irradiation were made for both purposes to obtain the best gas composition and to make comparisons with experimental results of optical spectra. It is concluded that the lasing will occur over the neutron flux of 5*10^<13>n/cm^2・sec.(2) Reactor Control by LaserA new reactor control mechanism is studied to decreasing the ^3He neutron absorption cross-section by half through the ^3He nucleus spin orientations by laser. That is confirmed possible in KEK using He+Rb gas system irradiated 795nm laser. Direct spin orientation by La-laser was also investigated.(3) Design of Reactor measurement & Control SystemAs a summary of this study, a design result on this system was proposed.

（1）激光中子探测本研究的一个新的基本思路是将包括^3He气体的核泵浦气体激光器应用于中子探测器，首先尝试了He-Ne气体。因为它的中子敏感性较低，因为^3He气体压力较低，约为10托，所以选择He-Ne-Ar气体，因为它在其工作时可以含有大约3个^3He气体原子。利用YAYOI（东京大学）和JRR-4（JAERI）的研究堆进行了^3He-Ne-Ar气体电池的中子辐照实验，对该气体在中子辐照下的激光过程进行了模拟计算。为了获得最佳气体成分并与光谱实验结果进行比较得出的结论是，激光将在中子通量范围内发生。 5*10^<13>n/cm^2·sec.(2) 激光反应堆控制研究了一种新的反应堆控制机制，通过激光改变^3He核自旋方向，将^3He中子吸收截面减少一半。在KEK中使用He+Rb气体系统照射795nm激光证实了这一点，并且还研究了La激光的直接自旋取向。(3)反应堆测量和控制系统的设计。总结本研究，提出了该系统的设计结果。