Effect of duct bias on transport of vacuum arc plasmas through curved magnetic filters
Effect of duct bias on transport of vacuum arc plasmas through curved magnetic filters
复制标题
管道偏置对真空电弧等离子体通过弯曲磁过滤器传输的影响
DOI：
10.1063/1.355777
复制
发表时间：
1994
影响因子：
3.2
通讯作者：
I. Brown
中科院分区：
文献类型：
--
作者：
A. Anders;S. Anders;I. Brown
用朗缪尔探头测量了真空弧光等离子体90°磁巨粒子滤光片的等离子体输出随管壁偏压和引导磁场的变化。在约20V的正偏压下，等离子体通过滤光片的输运达到最大值。在10-30mT的较小磁场下，就足以有效地引导等离子体，而引导磁场的进一步增加只是逐渐提高了滤光片的效率。随着导向场的增大，漂浮管道的电势由负变为正。这可以用横跨磁场的电子和离子通量的平衡来解释。在高导向场(≳120mT)下，碳的等离子体输出达到饱和，而重元素则没有。等离子体通过弯曲管道的传输是通过导向场的磁压、鞘电场和空间电荷电场来实现的。
The plasma output of a 90° magnetic macroparticle filter of vacuum arc plasma was monitored by a Langmuir probe as a function of bias of the duct wall and guiding magnetic field. Maximum plasma transport through the filter was found at a positive bias of about 20 V. A relatively small magnetic field of 10–30 mT is sufficient for effective guiding of the plasma, and further increase of the guiding field improves the filter efficiency only gradually. The potential of a floating duct changes from negative to positive when the guiding field is increased. This can be explained by the balance of electron and ion flux transverse to the magnetic field. Saturation in the plasma output at high guiding field (≳120 mT) is observed for carbon but not for heavy elements. The transport of plasma through bent ducts is made possible by the magnetic pressure of the guiding field, and by sheath and space‐charge electric fields.