Randy and John came to help us to install the new High Voltage power supply for x-ray anode. This will simplify the system.
When we tried to apply voltage up to 4kV, we found there was a big current leak. We traced the whole circuit including Thyratron, charging resistors, Ross relay and tranformer connectors. The problem is from the resistor plate, there was a screw hole, which was drilled very deep to cause an arcing when applied high voltage. Randy decided to replace them with the Nylon screws.