SYSTEM FOR MEASURING IONIZATION CHAMBER CURRENTS IN EXPERIMENTS WITH SYNCHROTRON RADIATION
D. V. Dorokhov, E. A. Kuper
Budker Institute of Nuclear Physics, Siberian Branch, Russian Academy of Sciences, pr. Akademika Lavrent’eva 11, Novosibirsk, 630090 Russia
Keywords: low-current meter, sigma-delta ADC, ionization chamber
Abstract
A device for measuring ionization chamber currents in the range from 5·10–15 to 3·10–6 A is presented. The intrinsic noise is analyzed and it shown that its root-mean-square value does not exceed the estimated minimum of 5 fA. The device is designed for experiments with synchrotron radiation, but it can also be used in applications requiring low-current measurements.
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