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

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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,

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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