Development of capillary plate neutron detector filed with liquid scintillator by using recoiled-particle trajectory analyses
Development of capillary plate neutron detector filed with liquid scintillator by using recoiled-particle trajectory analyses
复制标题
利用反冲粒子轨迹分析开发装有液体闪烁体的毛细管板中子探测器
DOI：
10.1088/1748-0221/14/10/c10026
复制
发表时间：
2019
影响因子：
1.3
通讯作者：
Isobe M.
中科院分区：
文献类型：
--
作者：
Nishitani T.;Arikawa Y.;Kishimoto H.;Murata I.;Ogawa K.;Pu N.;Isobe M.
针对大型螺旋装置（LHD）氘等离子体实验中triton燃烧的研究，研制了一种新型的14mev液体闪烁毛细管板中子探测器。探头采用直径为25mm、厚度为10mm、间距为10 μm的蜂窝结构毛细管板。闪烁光轨迹由电子倍增CCD （EMCCD）通过继电器透镜测量。用粒子和重离子输运编码系统（PHITS）模拟了中子和伽马射线的运动轨迹。估计14 MeV中子和2.45 MeV中子的最大轨迹长度分别为2 mm和0.1 mm。质子被中子反冲的轨迹是线性的，轨迹长度取决于反冲质子的能量。另一方面，由于电子在闪烁体中的随机游走，伽马射线产生的电子的轨迹不是直线的。因此，我们可以通过轨迹长度和形状，从2.45 MeV中子和伽马射线中识别出14 MeV中子。开发的探测器安装在LHD环面大厅的地下室，位于嵌入地板混凝土的垂直准直器下方，用于2018年LHD第二次氘等离子体运动。我们确定了由于质子在LHD氘放电中被14mev中子反冲而考虑的轨迹。
New 14 MeV neutron detector using capillary plate with liquid scintillator has been developed aiming at the triton burn-up study on the deuterium plasma experiment of the Large Helical Device (LHD). A capillary plate with 25 mm in diameter, 10 mm in thickness, and 10 μm pitch honeycomb structure is used as a detector head. The scintillating light trajectory is measured by an Electron-Multiplying CCD (EMCCD) via relay lenses. The trajectories for neutrons and gamma-rays are simulated by the Particle and Heavy Ion Transport code System (PHITS). Maximum trajectory length is estimated to be 2 mm and 0.1 mm for 14 MeV neutron and 2.45 MeV neutron, respectively. The trajectory of a proton recoiled by a neutron is linear, and the trajectory length depends on the recoiled proton energy. On the other hand, the trajectory of an electron produced by gamma-ray is not straight due to the random walk of the electron in the scintillator. Therefore, we can identify 14 MeV neutrons from 2.45 MeV neutrons and gamma-rays by the trajectory length and the shape. The developed detector was installed in the basement of the LHD torus hall just under the vertical collimator embedded in the floor concrete for the second deuterium plasma campaign of LHD in 2018. We identify trajectory which is considered due to the proton recoiled by14 MeV neutrons on the LHD deuterium discharge.