Good suggestions, Will & Patientman, I could definitely see them being addressed as part of future optimization. For example, if the walls of the vacuum chamber could be used as the cathode, then the X-ray energy capture materials could be brought that much closer; but perhaps there is such a thing as too close, if the flux of low energy neutrons from side reactions might then causes excessive damage (but the neutrons will still be too low energy to cause “activation,” so still no radioactive waste!).
