Numerical simulation of gas discharge with external particle source injected
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摘要: 利用Geant4程序建立外源注入式、低气压气体开关物理模型，通过模拟计算电子增益与极板间电场强度、电子增益与极板间隙距离的函数关系验证了模型的正确性。计算了气体种类、气体压强对电子增益的影响，分析得到形成自持放电所需最小入射电子数，计算结果表明：在相同的气压及电场条件下，氮气的电子增益远大于氦气，这与氦气的高电离能性质相吻合; 随气压增大，电子增益呈非线性增长; 为实现自持放电，外源注入电子数面密度为1×105~2×105 /cm2。Abstract: This paper presents the design of a new low-gas-pressure gas switch that uses an external particle source for generating the original ionized particles, using Geant4 program to build the physical model of the switch. Verification shows that the model is reliable and effective. The model is adopted to calculate the effect of gas species and gas pressure on electron gain, get the minimum injected-electron number for forming self-sustained discharge. The simulation results show that the electron gain of nitrogen is considerably larger than that of helium, which is in accordance with the higher ionization energy of helium. The electron gain increases with increasing gas pressure in the form of nonlinear growth. To form self-sustained discharge, the density of injected-electron is (1-2)×105/cm2.
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Key words:
- external particle source injected /
- low gas pressure /
- gas switch /
- Geant4 /
- discharge simulation
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图 3 电离系数与电场强度的拟合曲线
Figure 3. Function fit of ionization coefficient with electric field strength
图 4 电子增益随气体(氮气、氦气)压强的变化曲线
Figure 4. Changing curves of electron gain with gas(N2, He) pressure
图 7 阳极板上出射电子面分布和计数图
Figure 7. Surface distribution and counts of outgoing electron on anode plate
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[1] Liu Xuandong, Sun Fengju, Liang Tianxue, et al. Experimental study on multigap multichannel gas spark closing switch for LTD[J]. IEEE Trans Plasma Science, 2009, 37(7): 1318-1323. doi: 10.1109/TPS.2009.2020729 [2] Kovalchuk B M, Kim A A, Kumpjak E V, et al. Multi gap switch for Marx generators[C]//PPPS-2001 Pulsed Power Plasma Science. 2001: 1739-1742. [3] LeChien K R, Gahl J M. Investigation of a multichanneling, multigap Marx bank switch[J]. Review of Scientific Instruments, 2004, 75(1): 174-178. doi: 10.1063/1.1630834 [4] Winands G J J, Liu Z, Pemen A J M, et al. Long lifetime, triggered, spark-gap switch for repetitive pulsed power applications[J]. Review of Scientific Instruments, 2005, 76: 085107. doi: 10.1063/1.2008047 [5] 肖登明. 气体放电与气体绝缘[M]. 上海: 上海交通大学出版社, 2017.Xiao Dengming. Gas discharge and gas insulation. Shanghai: Shanghai Jiaotong University Press, 2017 [6] 李俊娜, 邱爱慈, 蒯斌, 等. 自耦式紫外预电离开关特性[J]. 强激光与粒子束, 2008, 20(6): 994-998. http://www.hplpb.com.cn/article/id/3620Li Junna, Qiu Aici, Kuai Bin, et al. Characteristics of capacitance-resistance coupling UV illumination switch. High Power Laser and Particle Beams, 2008, 20(6): 994-998 http://www.hplpb.com.cn/article/id/3620 [7] Ouyang Jianming, Ma Yanyun, Shao Fuqiu, et al. Ionization effect of atmosphere by prompt gamma rays from high-altitude nuclear explosions[J]. IEEE Trans Nuclear Science, 2014, 61(3): 1433-1438. doi: 10.1109/TNS.2014.2320595 [8] Xiao Lei, Deng Xin, Ma Jiangbo, et al. Numerical simulation of voltage applied to the gaps of a planar multi-gap multi-channel gas switch[J]. Journal of Fusion Energy, 2015, 34(5): 954-958. doi: 10.1007/s10894-015-9902-y [9] Zheng Chenghang, Zhang Xuefeng, Yang Zhengda, et al. Numerical simulation of corona discharge and particle transport behavior with the particle space charge effect[J]. Journal of Aerosol Science, 2018, 118: 22-33. doi: 10.1016/j.jaerosci.2018.01.008 [10] Lisovskiy V A, Ogloblina P A, Dudin S V, et al. Current gain of a pulsed DC discharge in low-pressure gases[J]. Vacuum, 2017, 145: 194-202. doi: 10.1016/j.vacuum.2017.08.042 [11] Agostinelli S, Allison J, Amako K, et al. Geant4—a simulation toolkit[J]. Nuclear Instruments and Methods in Physics Research, 2003, 506(3): 250-303. doi: 10.1016/S0168-9002(03)01368-8 [12] Allison J, Amako K, Apostolakis J, et al. Geant4 developments and applications[J]. IEEE Trans Nuclear Science, 2006, 53(1): 270-278. doi: 10.1109/TNS.2006.869826 [13] 徐学基, 诸定昌. 气体放电物理[M]. 上海: 复旦大学出版社, 1996.Xu Xueji, Zhu Dingchang. Gas discharge physics. Shanghai: Fudan University Press, 1996 [14] 郑殿春. 气体放电数值仿真方法[M]. 北京: 科学出版社, 2017.Zheng Dianchun. Numerical simulation methods for gas discharge. Beijing: Science Press, 2017 [15] Liu W, Shi J J, Kong M G. Electron trapping in radio-frequency atmosphere-pressure glow discharge[J]. Applied Physics Letters, 2007, 90: 041502. doi: 10.1063/1.2425045 [16] Mesyrats G A. Pulsed power[M]. New York: Plenum Publisher, 2005: 66-70. -
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