强激光与粒子束, 2011, 23 (6): 1692, 网络出版: 2011-07-04  

阶梯型脉冲电压诱导连续能量质子谱数值仿真

Numerical simulation of proton generation with continuous energy spectrum by pulse voltage with discrete steps
作者单位
哈尔滨工业大学 现代焊接生产技术国家重点实验室, 哈尔滨 150001
摘要
热控涂层质子辐照的地面模拟研究中采用单一能量质子替代空间能量连续分布的质子,连续能量质子谱是其等效性研究的关键。提出了采用阶梯型脉冲负偏压鞘层加速技术在一个脉冲宽度内获得连续能量质子谱的方法,并利用质点网格法对所获得质子谱的剂量-能量关系进行了数值仿真研究,分析了连续能量质子谱的剂量-能量分布特征及连续能量质子谱的形成过程。结果表明: 阶梯型脉冲负偏压鞘层加速能够产生连续能量的质子谱,连续谱是每微秒区间入射到样品的质子叠加而成的,且每个区间所产生质子的能量与该区间电压值相对应,连续谱中,随着质子能量的增加,其剂量总体上呈现下降的趋势。
Abstract
The performance degradation of spacecraft thermal control coatings irradiated by protons is generally investigated by using protons with the same energy in ground testing while the energy of protons is in succession in space. The irradiation equivalence of the two kinds of protons is still not well understood. In this paper, a method of producing protons with continuous energy by plasma sheath acceleration using pulse voltage with discrete steps is proposed for better analysis of irradiation equivalence. The dose-energy distribution on the sample is numerically investigated by particle-in-cell(PIC) method. The characteristics of dose-energy distribution and the formation mechanism of protons with continuous energy are then discussed. The results show that protons with continuous energy can be realized utilizing pulse voltage with discrete steps, as the energy of protons irradiating the sample overlaps between two adjacent 1 μs periods, and the energy of protons produced is closely related to the voltage on the sample in every 1 μs period. Moreover, the number of protons irradiating the sample may decrease if the proton energy increases.
参考文献

[1] 李瑞琦, 李春东, 何世禹, 等. keV质子辐照对Kapton/Al光学性能的影响[J]. 强激光与粒子束, 2007,19(3): 500-502.(Li Ruiqi, Li Chundong, He Shiyu, et al. Effect of keV proton irradiation on optical properties of Kapton/Al film.High Power Laser and Particle Beams,2007,19(3): 500-502)

[2] 肖海英, 李春东, 杨德庄, 等. 低能质子辐照对ZnO白漆光学性能退化的影响[J]. 强激光与粒子束, 2008,20(8): 1369-1372.(Xiao Hai-ying, Li Chundong, Yang Dezhuang, et al. Effects of low energy protons on optical degradation of ZnO white paint.High Power Laser and Particle Beams,2008,20(8): 1369-1372)

[3] Pippin H G, Woll S L B, Blohowiak K Y, et al. On-orbit and ground testing of space environment interactions with materials[J].Progress in Organic Coating,2003,47(4): 458-468.

[4] 范鲜红, 陈波, 关庆丰, 等. 质子辐照对极紫外波段滤光片透过率的影响[J]. 强激光与粒子束, 2009,21(6): 931-935.(Fan Xianhong, Chen Bo, Guan Qingfeng, et al. Effect of proton irradiation on transmittance of Al filter at EUV waveband.High Power Laser and Particle Beams,2009,21(6): 931-935)

[5] Li Chundong, Yang Dezhuang, He Shiyu. Degradation of Teflon film under radiation of protons and electrons[J].Journal of Spacecraft and Rockets,2004,41(3): 373-376.

[6] Lu Qiuyuan, Li Liuhe, Li Jianhui, et al. Impact energy and retained dose uniformity in enhanced glow discharge plasma immersion ion implantation[J].Appl Phys Lett,2009,95: 061503.

[7] 黄永宪, 田修波, 杨士勤, 等. 脉冲偏压上升沿特性对等离子体浸没离子注入鞘层扩展动力学的影响[J]. 物理学报, 2007,56(8): 4762-4770.(Huang Yongxian, Tian Xiubo, Yang Shiqin, et al. Effect of rise-time patterns on dynamics of sheath expansion during plasma immersion ion implantation.Acta Physica Sinica,2007,56(8): 4762-4770)

[8] Cassel R, Hitchcock S. A new type high voltage fast rise/fall time solid state Marx pulse modulator[C]//Proceedings of PAC.2007: 865-867.

[9] Birdsall C K, Langdon A B. Plasma physics via computer simulation[M]. Bristol: Adam-Hilger, 1991.

[10] 黄永宪, 田修波, 杨士勤, 等. 等离子体浸没离子注入(PIII) 过程中初始离子阵鞘层尺度内各物理量的时空演化[J]. 真空科学与技术学报, 2005,25(2): 115-119. (Huang Yongxian, Tian Xiubo, Yang Shiqin, et al. Temporal evolution in an ion-matrix sheath during plasma immersion ion implantation. Journal of Vacuum Science and Technology, 2005, 25(2): 115-119)

[11] Miyagawa Y, Nakadate H, Tanaka M, et al. Particle-in-cell/Monte Carlo simulation for PBII processing of a trench shaped target and a cylindrical target[J].Surface and Coatings Technology,2004,186(1/2): 2-9.

[12] Briehl B, Urbassek H M. Simulation of sheath and presheath dynamics in PIII[J].Surface and Coatings Technology,2002,156(1/3): 131-135.

石经纬, 汪志健, 巩春志, 田修波, 杨士勤. 阶梯型脉冲电压诱导连续能量质子谱数值仿真[J]. 强激光与粒子束, 2011, 23(6): 1692. Shi Jingwei, Wang Zhijian, Gong Chunzhi, Tian Xiubo, Yang Shiqin. Numerical simulation of proton generation with continuous energy spectrum by pulse voltage with discrete steps[J]. High Power Laser and Particle Beams, 2011, 23(6): 1692.

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