Cavallo Apparatus Updates and Preparation for Cryogenic Testing

In many electric dipole moment (EDM) experimental measurements, a high voltage electrode is used to create a strong electric field region in which the EDM may be measured. There are many ways to achieve high voltage, though in cryogenic environments new constraints appear, namely the introduction of heat via high voltage transport. To solve this problem, a cryogenic Cavallo multiplier has been designed and created. This system avoids heating by applying a lower voltage (50 kV) to an electrode (A) which then induces a corresponding opposite charge on a second electrode (B) which is grounded. This electrode (B) then disconnects from ground and moves into contact with a third electrode (C), being the isolated high voltage electrode, where (B) releases the induced charge and returns to its grounded position. The target voltage for the high voltage electrode is ~650 kV. By repeating this process, we are able to achieve very high voltage without introducing heat from high voltage wires. This talk will present the Cavallo multiplier system at LANL, the results from the room temperature testing, and its preparation for testing in a LN2 environment.