The photos show the slow progress - I have yet to complete the rectifier and bus bar's - the circuit will be a 'Delon' doubler - the grey caps are rated at 12kv and the final working voltage 22kv for the main bank. The discharge needs to be a spark gap with graphite electrodes ( thanks again Doug ) as I don't have a large enough thyratron
also in the photo, a HV choke
Shown also is the 11kv pole pig as the main drive transformer