Capacitive divider with a circular array of capacitors to reduce self and mutual inductances of the low-voltage arm

Capacitive voltage dividers are key tools to
measure high-voltage pulses. A drawback of these dividers is the
self-resonance caused by the inductance of the connections,
resulting in unwanted oscillations in the measured signal. This
work aims to propose a design that reduces the amplitude of
these oscillations by simultaneously reducing the self and the
mutual inductances of the low-voltage arm. The decrease of both
inductances is achieved by using a coaxial symmetry of the lowvoltage
arm of the divider. It is then shown that the custom
capacitive divider designed in this work can be used to measure
the output voltage of spiral generators without any noticeable
parasitic oscillation up to several hundred kilovolts with voltage
division ratios up to 1:100000.