1990 Fiscal Year Final Research Report Summary
A Study on Radiation Triggered Laser as Neutron Detector
| Project/Area Number |
01460262
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| Research Category |
Grant-in-Aid for General Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
Nuclear engineering
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| Research Institution | The University of Tokyo |
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Principal Investigator |
NAKAZAWA Masaharu Univ. of Tokyo Fac. of Eng. Professor, 工学部, 教授 (00010976)
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| Co-Investigator(Kenkyū-buntansha) |
KOSAKO Toshiso Univ, of Tokyo RCNST Ass. Professor, 原子力研究総合センター, 助教授 (50114476)
TAKAHASHI Hiroyuki Univ. of Tokyo Fac. of Eng Res. Assistant, 工学部, 助手 (70216753)
IGUCHI Tetsuo Univ. of Tokyo Fac. of Eng. Ass. Professor, 工学部, 助教授 (60134483)
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| Project Period (FY) |
1989 – 1990
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| Keywords | Laser / Neutron Detection / 3HeーNe laser / Laser Amplification |
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| Research Abstract |
The aim of this research is an experimental study on a new laser oscillation mode by radiation irradiation on laser tude, named as radiation trigger laser, as a radiation detector. This new operation mode of 3He-Ne laser tube by neutron irradiation has been found in the previous year, where the decreasing effect of laser oscillation starting voltage has been found according to the increase of neutron flux level.
1. Model of Radiation Trigger Laser
Other commercial 3He-Ne laser tube, the operation circuit of which is called as high frequency oscillation mode instead of the constant voltage mode, has been found not to be available as the radiation trigger laser experimentally. Recent diode laser is also not available. From these results, the operation model of this radiation trigger laser can be considered just as the same as the radiation gas counter operation model, where the gas multiplication factor can be increased by the applied stationery voltage.
2. Laser Light Amplification by 3HeーNe gas Cell under Neutron Irradiation
When the 3HeーNe gas cell is made to be inverse population atate by neutron irradiation, the 3HeーNe laser light can be amplified by passing through this gas cell, which can be confirmed experimentally. The amplification gain can be increased by the neutron flux level. This effect can be considered as the beginning stage growing to the neutron pumping laser, and this is also considered as another radiation trigger laser.
3. Conclusion and Discussion
Fundamental model of radiation trigger laser can be summarized. Reactor neutron detection system using this radiation trigger laser has been discussed. Based on this model, more practical study is expected on design and demonstration of this radiation trigger laser as neutron detector.
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