Charge-Exchanged Beam Measurement by Using a Grid-Biased Faraday Cup
Charge-Exchanged Beam Measurement by Using a Grid-Biased Faraday Cup
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使用栅极偏置法拉第杯进行电荷交换光束测量
DOI：
10.1585/pfr.5.s2088
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发表时间：
2010
影响因子：
0.8
通讯作者：
M. Sasao
中科院分区：
文献类型：
--
作者：
A. Okamoto;T. Isono;T. Nishiuchi;H. Takahashi;S. Kitajima;M. Sasao
本文提出了一种用法拉第杯测量中性束流的方法。该方法使我们能够通过在法拉第杯前使用偏置栅极来控制二次电子来检测中性束。本文还提出了一种现场测定法拉第杯二次电子发射系数的方法。实验结果表明，对于能量为2-10 keV的氦束，确定了合适的发射系数。还测量了氦离子束通过氦气时电荷交换的中性通量。在速率方程的解所预期的压力以上观察到中性通量的饱和。该方法对中性束测量，特别是对小电流中性束测量有很好的应用前景。
A method for neutral beam measurement by using a Faraday cup is proposed in this paper. The method enables us to detect neutral beams by controlling secondary electrons by using a biasing grid in front of the Faraday cup. A procedure is also proposed for in situ determination of the secondary electron emission coefficient of the Faraday cup. Experimental results show that appropriate emission coefficients are determined for helium beams with energies of 2-10 keV. The neutral flux charge-exchanged from a helium ion beam passing through a helium gas is also measured. Saturation of the neutral flux is observed above the pressure expected from the solution of a rate equation. The method is promising for neutral beam measurement, especially for small current-neutral beams.