Development of multi faraday cup assembly for ion beam measurements from a low energy plasma focus device
Development of multi faraday cup assembly for ion beam measurements from a low energy plasma focus device
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DOI：
10.1143/jjap.44.5199
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发表时间：
2005-07-01
期刊：
影响因子：
--
通讯作者：
Hotta, E
中科院分区：
文献类型：
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作者：
Mohanty, SR;Bhuyan, H;Hotta, E
为测量低能等离子体聚焦装置的脉冲离子束，研制了多个法拉第杯组件。工作在偏置离子收集器模式下的法拉第杯具有纳秒响应，这些响应已被用来确定从箍缩等离子体柱中涌出的快速氮离子束的能谱和通量。使我们的法拉第杯独一无二的设计特点是，它们可以记录更高动力学值(类似于数百keV)以及更低动力学值(类似kev)的离子能量。已有可能将离子能量记录到类似于5keV的较低动能阈值，这一值比以往任何工作所获得的值都要低得多。本文还报道了离子束注量与充气压力的关系。离子测量的角度分布显示出高度各向异性的发射，表明在电极轴上存在离子凹陷。
A multiple Faraday cup assembly has been developed for measuring pulsed ion beam of a low energy plasma focus device. The Faraday cups operating in biased ion collector mode have nanosecond response and these have been used to determine the energy spectrum and flux of fast nitrogen ion beam emerging out of the pinched plasma column. The design feature that makes our Faraday cups unique is that they can register ion energy of higher kinetic value (similar to hundreds of keV) as well as lower kinetic value (similar to keV). It has been possible to register the ion energy upto a lower kinetic energy threshold of similar to 5 keV which is a value much lower than that obtained in any previous works. The correlation of the ion beam flux with filling gas pressure is also reported. Angular distribution of ion measurement reveals a highly anisotropic emission indicating an ion dip at the electrode axis.