Pulse neutron measurement of dense plasma focus device based on scintillation detector
-
摘要: 研制了用于稠密等离子体焦点（DPF）装置中子产额和时间分布监测的闪烁体探测器，通过仿真模拟闪烁体透出光子随厚度的变化曲线确定闪烁体的尺寸参数，并采用相对标定获得该探测器的中子探测灵敏度。根据Monte-Carlo 方法模拟了实验环境下的中子散射分布，并根据探头的线性范围等因素设计实验布局。利用研制的闪烁体探测器对自研的DPF装置的D-D脉冲中子产额和时间波形进行了测量，并对测量结果进行了分析和讨论。测试结果表明：设计的闪烁体探测器测试获得DPF装置产生的硬X 射线及中子波形，两者峰值信号时间差与2.45 MeV中子飞行时间相当，中子脉宽约百纳秒。Abstract: A scintillator detector for monitoring dense plasma focus (DPF) device neutron yield and waveform was developed. The size parameters of the scintillator were determined by simulating the curve of the variation of the photons emitted by the scintillator with the thickness, and the sensitivity of the detector was obtained by relative calibration. The scattering distribution in the experimental environment was simulated according to the Monte-Carlo method, and the experimental layout was designed according to factors such as the linear range of the probe. The D-D pulse neutron yield and time waveform of the self-developed DPF device were measured using the developed scintillator detector, and the measurement results were analyzed and discussed. The test results indicate that the scintillation detector has detected the hard X-rays and neutron waveforms generated by the DPF device. The time difference between their peak signals matches the flight time of 2.45 MeV neutrons, with a neutron pulse width of about hundreds of nanoseconds.
-
Key words:
- dense plasma focus /
- plastic scintillator detector /
- neutron flight time /
- neutron yield /
- sensitivity
-
图 2 闪烁体厚度对透出光子的影响关系
Figure 2. Influence of scintillator thickness on transmitted photon energy
-
[1] Mather J W. Formation of a high-density deuterium plasma focus[J]. Physics of Fluids, 1965, 8(2): 366-377. [2] Kaloyan A A, Kovalenko E S, Pakhnevich A V, et al. The contrast scale of minerals for neutron tomography of paleontologic and geologic objects[J]. Russian Geology and Geophysics, 2017, 58(11): 1435-1440. [3] Vlassenbroeck J, Cnudde V, Masschaele B, et al. A comparative and critical study of X-ray CT and neutron CT as non-destructive material evaluation techniques[J]. Geological Society, London, Special Publications, 2007, 271(1): 277-285. doi: 10.1144/GSL.SP.2007.271.01.26 [4] Gribkov V A, Karpinski L, Strzyżewski P, et al. New efficient low-energy dense plasma focus in IPPLM[J]. Czechoslovak Journal of Physics, 2004, 54(3): C191-C197. [5] Schmidt A, Anaya E, Anderson M, et al. MegaJOuLe neutron imaging radiography (MJOLNIR) dense plasma focus rebuild and high current experiments[J]. IEEE Transactions on Plasma Science, 2024, 52(10): 4906-4915. [6] Schmidt A, Anaya E, Anderson M, et al. First experiments and radiographs on the MegaJOuLe neutron imaging radiography (MJOLNIR) dense plasma focus[J]. IEEE Transactions on Plasma Science, 2021, 49(11): 3299-3306. [7] Bennett N, Blasco M, Breeding K, et al. Development of the dense plasma focus for short-pulse applications[J]. Physics of Plasmas, 2017, 24: 012702. [8] 欧海彬, 段书超, 王刚华, 等. 稠密等离子体焦点二维模拟[J]. 强激光与粒子束, 2024, 36:075001 doi: 10.11884/HPLPB202436.240001Ou Haibin, Duan Shuchao, Wang Ganghua, et al. Two-dimensional simulation of dense plasma focus[J]. High Power Laser and Particle Beams, 2024, 36: 075001 doi: 10.11884/HPLPB202436.240001 [9] Liang Chuan, Li Mingjia, You Haibo, et al. A pulsed neutron source with a sealed dense plasma focus chamber[J]. Journal of Instrumentation, 2024, 19: P10035. [10] 王新新, 韩旻, 王志文, 等. 小型等离子体焦点及其中子辐射[J]. 中国科学(E辑), 1999, 29(1):76-81Wang Xinxin, Han Min, Wang Zhiwen, et al. Small plasma focal points and their neutron radiation[J]. Science in China (Series E), 1999, 29(1): 76-81 [11] 张建福, 陈亮, 李宏云, 等. DPF装置脉冲中子测量技术研究[J]. 核技术, 2010, 33(10):749-753Zhang Jianfu, Chen Liang, Li Hongyun, et al. Investigation of pulsed neutron measurements on the DPF device[J]. Nuclear Techniques, 2010, 33(10): 749-753 [12] Klir D, Kravarik J, Kubes P, et al. Fusion neutron detector for time-of-flight measurements in z-pinch and plasma focus experiments[J]. Review of Scientific Instruments, 2011, 82: 033505. [13] 郭洪生, 何锡钧, 彭太平, 等. DPF中子参数实时测量技术研究[J]. 核电子学与探测技术, 2001, 21(4):247-249 doi: 10.3969/j.issn.0258-0934.2001.04.003Guo Hongsheng, He Xijun, Peng Taiping, et al. The real-time parameter measurement of neutron source of DPF[J]. Nuclear Electronics & Detection Technology, 2001, 21(4): 247-249 doi: 10.3969/j.issn.0258-0934.2001.04.003 [14] 耿涛. 用于DPF装置中子测量的闪烁体探测器[J]. 强激光与粒子束, 2007, 19(6):1008-1010Geng Tao. Scintillation neutron detector for DPF device[J]. High Power Laser and Particle Beams, 2007, 19(6): 1008-1010 [15] Raeisdana A, Sadat Kiai S K, Sadighzadeh A, et al. Analysis of neutron emission in a dense plasma focus device[J]. Radiation Effects and Defects in Solids, 2021, 176(3/4): 265-273. -
下载:
点击查看大图
图(5)
计量
- 文章访问数: 115
- HTML全文浏览量: 45
- PDF下载量: 22
- 被引次数: 0
