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IBM Journal of Research and Development  
Volume 40, Number 1, Page 73 (1996)
Terrestrial cosmic rays and soft errors
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Portable Faraday cup for nonvacuum proton beams

by J. F. Ziegler, P. A. Saunders, T. H. Zabel
A portable Faraday cup design is described for the accurate measurement of large-diameter, low-current, and high-energy proton beams traveling in air. The unit has been tested with protons from 4 to 300 MeV. The unit has an accuracy of 10% for beams of 1 pA, improving to about 2% accuracy for ion currents of 20 pA to 1 µA.
Related Subjects: Beams, charged particle; Faraday cup, portable; Measurement