A Cryogenic High-Voltage Multiplier for SNS nEDM

The nEDM@SNS’s experimental goal to measure the neutron’s electric dipole moment (nEDM) with a sensitivity on the order of 10^-28 e cm requires an electric potential across the measurement cell of 650 kV in a sub-kelvin environment. A cryogenic, high-voltage multiplier based on Cavallo’s classic electrostatic induction machine is being developed to apply 650 kV to the nEDM measurement cells starting with an input voltage of 50 kV.  A cryogenic test apparatus is being developed to test this design, including simulations, charging tests, and sparking control strategies. A non-contact voltage measurement device is also being designed and implemented.