Ion acceleration in a solenoid-free plasma expanded by permanent magnets
Ion acceleration in a solenoid-free plasma expanded by permanent magnets
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DOI：
10.1063/1.2965497
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发表时间：
2008-08
影响因子：
2.2
通讯作者：
Kazunori Takahashi;K. Oguni;H. Yamada;T. Fujiwara
中科院分区：
文献类型：
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作者：
Kazunori Takahashi;K. Oguni;H. Yamada;T. Fujiwara
离子加速是在低压无螺线管等离子体中实现的，该等离子体由永磁体阵列扩展。虽然永磁体通常形成防止等离子体扩散和双层形成的尖点磁场，但是通过采用永磁体的双同心阵列，可以在等离子体源的出口附近产生恒定场区域和发散磁场。在0.35mTorr条件下，在发散场区产生了一个厚度为4cm的50 ~ 20 V的快速电位降，在扩散室中观察到了通过电位降加速的超声离子束。随着气压的降低，束流能量可以增加到40 eV以上。
Ion acceleration is achieved in a low-pressure solenoid-free plasma expanded by permanent magnet arrays. Although a permanent magnet normally forms cusp magnetic fields which prevents plasma diffusion and double layer formation, by employing double concentric arrays of permanent magnets, a constant field area, and a diverging magnetic field can be generated near the outlet of the plasma source. In the source, a rapid potential drop with 4cm thickness from 50V to 20V is generated at the diverging field area for 0.35mTorr and a supersonic ion beam accelerated through the potential drop is observed in the diffusion chamber. The beam energy can be increased up to over 40eV with a decrease in gas pressure.