Improvement of the stability of high-voltage generators for perturbations within a frequency bandwidth of 0.03--1000 Hz

We have realised an electronic device with the aim of improving the relative stability in voltage dV/V of an electrostatic generator (voltage 400 kV, current 4 mA). This stability rose to 2×10^-6 (from 2×10^-5 previously) within a frequency bandwidth of 0.03--1000 Hz. This electronic device, placed between the earth of the high-voltage generator and the earth of the utilisation, is autonomous, i.e. it can be applied for all kinds of generators, of low, high or very high voltage, with currents up to about 100 mA. The gain in stability can only be fixed after knowing the real characteristics of the generator, which should be improved.