A 128-channel picoammeter system and its application on charged particle beam current distribution measurements
arXiv:1509.09021 · doi:10.1063/1.4934849
Abstract
A 128-channel picoammeter system is constructed based on instrumentation amplifiers. Taking the advantages of high electric potential and narrow bandwidth in DC energetic charged beam measurements, current resolution better than 5 fA can be achieved. Two 128-channel Faraday cup arrays are built, and are employed for ion and electron beam current distribution measurements. Tests with 60 keV O3+ ions and 2 keV electrons show that it can provide exact boundaries when a positive charged particle beam current distribution is measured.
6 piges, 8 figures; Submitted to Review of Scientific Instruments