4-10 A 128-channel Picoammeter System and Its Application on Charged Particle Beam Current Distribution Measurements

摘要

The absolute current distribution is usually the most desirable parameter in experiments involving a charged particle beam. The Faraday cup array technique, a direct measurement of the absolute current distribution, has been developed both in one dimension[1] and two dimensions[2], providing a great advantage in terms of convenience. In this technique, a many-channel picoammeter (up to 128 channels) is necessary.