A Low-Voltage Ionization Chamber for the ITER

摘要

An ionization chamber with an operating supply voltage of 10 V has been designed for use at the ITER. The sensitivity of the chamber filled with air at atmospheric pressure is 100-200 times higher than the sensitivity of the chamber pumped down to a pressure of 10{sup}(-3)-10{sup}(-4) Torr. It is shown that application of the supply voltage modulation technique allows the pickup noise to be substantially reduced; as a result, the amplifier can be located at a large (70-100 m) distance from the chamber. Results of the experiments aimed at testing this technique on the T-10 facility are described.