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A 128-channel picoammeter system and its application on charged particle beam current distribution measurements
Deyang Yu1, Junliang Liu1, Yingli Xue1
1Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China.
Abstract:
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.
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