A New Physical Image on Backstreaming Ions

  • Backstreaming ions issue is a major concern for new generation radiography facilities based on LIA (linear induction accelerator). Its theory based on dynamics of single particle driving by beam charge field predicts that the ions could bring adverse effect on beam focus, resulting in degrade of radiography resolution. The predicted phenomena have not been observed until now. A new physical image on ions movement is presented here. Through analysis, it is found that an ions sheath transition zone could form between the target surface and the plasma. The sheath zone could counteract the beam space charge field applied on the positive ions. So using mass movement of diffusion to study ions behavior may be more proper. A verification experiments on the new image is also given in the end.
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  • [1] . Burns M J et al. DARHT Accelerators Update and Plansfor Initial Operation. In: Proceedings of the 1999 ParticleAccelerator Conference. New York, U S, 1999. 6172. Merle E et al. Status of the AIRIX Accelerator. In: Pro-ceedings of the 1999 Particle Accelerator Conference. NewYork, U S, 1999. 32603. DENG Jian-Jun et al. High Power Laser and ParticleBeams, 2003, 15(5):502—504(in Chinese)(邓建军等.强激光与粒子束,2003, 15(5): 502-504)4. Welch D R, Hughes T P. Laser and Particle Beam, 1997,16(2): 285—2945. Sampayan S, Buckles R, Caporaso G et al. Beam-TargetInteraction Experiments for Bremsstrahlung Converter Ap-plications. PAC99, 1303—13056. Vermare C, Davis H A, Moir D C. Physics of Plasmas, 2003,10(1): 277—2847. LONG J D. Study on Backstreaming Ions Issue and SomeOthers of The Target Zone in Linear Induction Accelerator.PhD Thesis. Tsinghua, 2005(in Chinese)(龙继东.直线感应加速器中靶区回流离子等若干物理问题研究.博士论文.清华大学,2005)8. Kwan T J. IEEE Transactions on Plasma Science, 2000,28(1): 268—2709. Oliver B V, Welch D R, Hughes T P. Beam-Target Inter-action in Single- and Multi-Pulse Radiography. UCRL-CR-13427110. LONG J D. HEP NP, 2005, 29(5): 501—506(in Chinese)(龙继东.高能物理与核物理,2005, 29(5): 501-506)11. Mesyats G A, Proskurovsky D I. Pulsed Electrical Dis-charge in Vacuum. Springer-verlag, 1989. 192—19812. Hallal M P. The Onset of Breakdown in a Fast Pulsed Vac-uum Diode. Naval Postgraduate School, Monterey, Califor-nia, 199113. Willis G. Investigation of Onset of Plasma Formation atAnode of Fast-Pulsed High Voltage Vacuum Diodes. NavalPostgraduate School, Monterey, California, 199314. Wright C M. Time Resolved Measurements of Light Pro-duced by Onset of Plasma Formation on Electrodes of FastPulsed High Voltage Diodes. Naval Postgraduate School,Monterey, California, 199315. XU Xue-Ji, ZHU Ding-Chang. Gas Discharge Physics.Shanghai: Press of Shanghai University, 1995. 148—151(in Chinese)(徐学基,诸定昌.气体放电物理.上海:复旦大学出版社,1995:148-151)16. YANG Jin-Ji. Gas Discharge. Beijing: Science Press, 1983.50(in Chinese)(杨津基.气体放电.北京:科学出版社,1983. 50)17. XIANG Zhi-Lin, YU Chang-Xuan. High Temperature Plasma Diagnostics Techniques (The Second). Shanghai:Press of Shanghai Science and Technology, 1982. 113(in Chinese)(项志遴,俞昌旋.高温等离子体诊断技术(下册).上海:上海科学技术出版社,1982. 113)
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LONG Ji-Dong, LIN Yu-Zheng, SHI Jin-Shui and YU Hai-Jun. A New Physical Image on Backstreaming Ions[J]. Chinese Physics C, 2005, 29(12): 1185-1189.
LONG Ji-Dong, LIN Yu-Zheng, SHI Jin-Shui and YU Hai-Jun. A New Physical Image on Backstreaming Ions[J]. Chinese Physics C, 2005, 29(12): 1185-1189. shu
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Received: 2005-03-04
Revised: 1900-01-01
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A New Physical Image on Backstreaming Ions

    Corresponding author: LONG Ji-Dong,

Abstract: Backstreaming ions issue is a major concern for new generation radiography facilities based on LIA (linear induction accelerator). Its theory based on dynamics of single particle driving by beam charge field predicts that the ions could bring adverse effect on beam focus, resulting in degrade of radiography resolution. The predicted phenomena have not been observed until now. A new physical image on ions movement is presented here. Through analysis, it is found that an ions sheath transition zone could form between the target surface and the plasma. The sheath zone could counteract the beam space charge field applied on the positive ions. So using mass movement of diffusion to study ions behavior may be more proper. A verification experiments on the new image is also given in the end.

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