Status of the preparation for the cryogenic test of the full scale cryogenic high voltage multiplier for nEDM@SNS

A finite measurement of the neutron’s electric dipole moment (nEDM) would have substantial bearing on the standard model of particle physics and many beyond standard model theories. The nEDM@SNS experiment, to be conducted at the Spallation Neutron Source at Oak Ridge National Laboratory, will search for the nEDM in neutrons held in a superfluid helium volume and is anticipated to yield nearly two orders of magnitude increase in sensitivity over completed experiments. The high voltage system relies on multiplication of a moderate high voltage to ~650 kV, internal to the sub-Kelvin volume, by the principle of Cavallo’s voltage multiplier. This talk will present work at Los Alamos National Laboratory to prepare the test cryostat and diagnostics for the Cavallo voltage multiplier apparatus and our plans to demonstrate 1.5K cryogenic operation of the high voltage source for nEDM@SNS.