Basic Study on Reactor Measurement & Control System by Laser

反应堆测量基础研究

• 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; 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

(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）LASERA的中子检测本研究的新基本思想是将核泵激光器应用于中子检测器，包括 ^3HE气体。当起初，尝试使用激光，因此尝试了he-ne气体，因为其低 ^3E气体压力约为10 torr而引起的中子敏感性较低。然后，选择了He-ne-AR气体，因为它在激光操作时可以包含大约3个原子。使用Yayoi（Tokyo.of Tokyo）和JRR-4（JRR-4（JAERI）的研究反应器，进行 ^3he-ne-ne-ar气体细胞的无辐照实验。为了获得最佳气体组成并与光谱的实验结果进行比较，对中子辐照下这种气体的激光过程进行了模拟计算。可以得出结论，在中子通量上将发生激光，该中子通量在5*10 ^<13> n/cm ^2 sec。（2）通过Lasera进行的反应堆控制新反应堆控制机制，以减少 ^3he中子抽象的交叉截面一半，通过激光通过 ^3he核旋转。使用He+RB气体系统辐照了795nm激光器，可以在KEK中确认这一点。还研究了通过LA-LASER直接旋转定向。（3）反应堆测量和控制系统的设计摘要，提出了该系统的设计结果。