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Chinese Physics C> 2013, Vol. 37> Issue(5) : 057002 DOI: 10.1088/1674-1137/37/5/057002

Effect of H- ion extraction on a plasma sheath underan external weak magnetic field

  • The extraction of negative ions inevitably leads to the destruction of the original plasma state. To understand the effect of extraction on a plasma sheath under a weak magnetic filter field, the time-dependent behavior of H- ion extraction from a negative ion source has been studied by particle-in-cell simulation in the collisionless limit. The simulation results have shown that the plasma sheath would undergo a transient process, in which there exists an edge electrostatic wave that propagates counterclockwise along the wall with a velocity of 4 mm/ns until it reaches the other side of extraction aperture. The thickness of the plasma sheath and the plasma potential both increase greatly at the final quasi-steady-state. For comparison, the results of extracting positive ions are also given.
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    [1] Hatayama A. Rev. Sci. Instrum., 2008, 79: 02B901[2] McNeely P, Dudin S V, Christ-Koch S, Fantz U, the NNBI Team. Plasma Sources Sci. Technol., 2009, 18: 014011[3] Steen P G, Graham W G. Appl. Phys. Lett., 1999, 75: 2737[4] Birdsall C K, Langdon A B. Plasma Physics via Computer Simulation New York: McGraw-Hill, 1985[5] Becker R. Rev. Sci. Instrum., 2006, 77: 03A504[6] Becker R. AIP Conf. Proc. 2005, 763: 194[7] Becker R, Herrmannsfeldt W B. Rev. Sci. Instrum., 1992, 63: 2756[8] Sakurabayashi T, Hatayama A, Bacal M. J. Appl. Phys., 2004, 95: 3937[9] Sakurabayashi T, Hatayama A, Bacal M. Rev. Sci. Instrum., 2004, 75: 1770[10] Hatayama A, Matsumiya T, Sakurabayashi T. Rev. Sci. Instrum., 2006, 77: 03A530[11] Spadtke P, Muhle C. Rev. Sci. Instrum., 2000, 71: 820[12] Gozadinos G, Vender D, Turner M M. Journal of Computational Physics, 2001, 172: 348

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LAN Chao-Hui, PENG Yu-Fei, YANG Zhen and LONG Ji-Dong. Effect of H- ion extraction on a plasma sheath underan external weak magnetic field[J]. Chinese Physics C, 2013, 37(5): 057002. doi: 10.1088/1674-1137/37/5/057002
LAN Chao-Hui, PENG Yu-Fei, YANG Zhen and LONG Ji-Dong. Effect of H- ion extraction on a plasma sheath underan external weak magnetic field[J]. Chinese Physics C, 2013, 37(5): 057002.  doi: 10.1088/1674-1137/37/5/057002 shu
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Received: 2012-07-02
Revised: 1900-01-01
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Effect of H- ion extraction on a plasma sheath underan external weak magnetic field

    Corresponding author: LAN Chao-Hui,
  • Received Date: 2012-07-02
  • Accepted Date: 1900-01-01
  • Available Online: 2013-05-05

Abstract: The extraction of negative ions inevitably leads to the destruction of the original plasma state. To understand the effect of extraction on a plasma sheath under a weak magnetic filter field, the time-dependent behavior of H- ion extraction from a negative ion source has been studied by particle-in-cell simulation in the collisionless limit. The simulation results have shown that the plasma sheath would undergo a transient process, in which there exists an edge electrostatic wave that propagates counterclockwise along the wall with a velocity of 4 mm/ns until it reaches the other side of extraction aperture. The thickness of the plasma sheath and the plasma potential both increase greatly at the final quasi-steady-state. For comparison, the results of extracting positive ions are also given.

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