A 128-channel picoammeter system and its application on charged particle beam current distribution measurements.
A 128-channel picoammeter system and its application on charged particle beam current distribution measurements.
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DOI：
10.1063/1.4934849
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发表时间：
2015-09
期刊：
影响因子：
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通讯作者：
Deyang Yu;Junliang Liu;Y. Xue;Mingwu Zhang;Xiaohong Cai;Jianjun Hu;Jinmei Dong;Xin Li
中科院分区：
文献类型：
--
作者：
Deyang Yu;Junliang Liu;Y. Xue;Mingwu Zhang;Xiaohong Cai;Jianjun Hu;Jinmei Dong;Xin Li
基于仪表放大器构成了一个128通道皮安计系统。利用直流高能带电束测量中的高电势和窄带宽，可以实现优于5fA的电流分辨率。两组128通道条形电极在印刷电路板上实现，并用于离子和电子束电流分布测量。用60 keV O（3+）离子和2 keV电子的实验表明，当测量正电荷粒子束流分布时，它能提供精确的边界。
A 128-channel picoammeter system is constructed based on instrumentation amplifiers. Taking advantage of a high electric potential and narrow bandwidth in DC energetic charged beam measurements, a current resolution better than 5 fA can be achieved. Two sets of 128-channel strip electrodes are implemented on printed circuit boards and are employed for ion and electron beam current distribution measurements. Tests with 60 keV O(3+) ions and 2 keV electrons show that it can provide exact boundaries when a positive charged particle beam current distribution is measured.