Development of Directional Neutron Detector for Fusion Neutron Emission Profile Measurement

用于聚变中子发射剖面测量的定向中子探测器的研制

• 批准号: 11558056
• 负责人: IGUCHI Tetsuo
• 金额: $ 8.83万
• 依托单位: Nagoya University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1999
• 资助国家: 日本
• 起止时间: 1999 至 2001
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-11558056/
• 关键词: Nuclear Fusion; Neutron Measurement; Fast Neutron Camera; Directional Neutron Detector; Rare Gas Scintillator; Burning Plasma Diagnostics; 高指向性中性子検出器

The present study is aiming to develop a compact fast neutron camera based on an array of a small size of directional neutron detectors toward advanced neutron emission profile measurement for magnetic confinement fusion (DT and/or DD) plasma experiment. The detector concept is a counter telescope made of He(or H_2)-Xe gas scintillator to selectively detect recoil heliums (or protons) scattered in the forward direction through elastic collision with incident neutrons. We have made an optimal design and trial construction of a prototype detector to verify the basic performance experimentally, and also given a design consideration of the compact fusion neutron camera system for practical use in an existent fusion device.The main results are summarized as follows ;(1) The light output characteristics of He-Xe gas scintillator has been experimentally made clear on α (recoil He) detection through optimization of gas purification and gas mixture ratio.(2) The Monte Carlo simulation program for the detector response to neutron with an arbitrary energy has been developed, which has given an optimal design of the directional neutron detectors based on He-Xe and H_2-Xe gas scintillators for DT and DD neutron detection, respectively.(3) The basic performance on a trial manufactured prototype detector system has been verified with an accelerator DT neutron source, including some proposals for further improvement toward practical application.(4) The design consideration of a neutron camera based on an array of directional neutron detectors has been made for DD plasma experiment at LHD (in NIFS). It has been demonstrated that the present neutron camera system can largely reduce its volume up to 1/20 less than that of a conventional one with a multichannel neutron collimator, keeping almost the same performance.

本研究的目的是开发一种紧凑的快中子相机的基础上的一个小尺寸的定向中子探测器阵列先进的中子发射剖面测量磁约束聚变（DT和/或DD）等离子体实验。探测器概念是由He（或H_2）-Xe气体闪烁体制成的计数望远镜，用于选择性地探测通过与入射中子的弹性碰撞而向前散射的反冲氦（或质子）。我们对原型探测器进行了优化设计和试制，通过实验验证了探测器的基本性能，并给出了在现有聚变装置上实用的紧凑型聚变中子照相机系统的设计考虑，主要结果如下：（1）从实验上明确了氦-氖气体闪烁体的光输出特性通过优化气体净化和气体混合比的（反冲He）检测。(2)本文编制了探测器对任意能量中子响应的蒙特卡罗模拟程序，给出了分别用于DT和DD中子探测的He-Ne和H_2-Ne定向中子探测器的优化设计。(3)利用加速器DT中子源验证了试制的原型探测器系统的基本性能，并提出了进一步改进的建议。(4)介绍了一种用于LHD DD等离子体实验的定向中子探测器阵列中子照相机的设计。结果表明，与常规中子照相机系统相比，本中子照相机系统的体积可缩小1/20，而性能基本相同。

项目成果

T.Iguchi, S.Iizuka, A.Uritani, J.Kawarabayashi: "Conceptual Design of Compact Neutron Camera with Directional Neutron Detector for Nuclear Fusion Experiment"Fusion Technology. 39・2. 1147-1151 (2001)

T.Iguchi、S.Iizuka、A.Uritani、J.Kawarabayashi：“核聚变实验用定向中子探测器的紧凑型中子相机的概念设计”39・2（2001）。

T.Iguchi, S.Iizuka, A.Uritani, J. Kawarabayashi: "Conceptual Design of Compact Neutron Camera with Directional Neutron Detector for Nuclear Fusion Experiment"Fusion Technology. 39(2). 1147-1151 (2001)

T.Iguchi、S.Iizuka、A.Uritani、J. Kawarabayashi：“用于核聚变实验的带有定向中子探测器的紧凑型中子相机的概念设计”聚变技术。

T.Iguchi,S.Iizuka,A.Uritani and J.Kawarabayashi: "Conceptual Design of Compact Neutron Camera with Directional Neutron Detector for Nuclear Fusion Experiment"Proc.14^<th> Topical Meeting on the Technology of Fusion Energy. (To be pubulished). (2001)

T.Iguchi、S.Iizuka、A.Uritani 和 J.Kawarabayashi：“核聚变实验用定向中子探测器的紧凑型中子相机的概念设计”Proc.14^<th>聚变能技术专题会议。