So evidently this thing puts out up to 200kV and 10mA... up to 900w. Maybe I'll just use it as a lab power supply and I can fry my projects even faster than normal!
x ray generators, by design, don't supply continuous power, just during the exposure time which is usually less than a second. 'mAs' is the time by current parameter, important in radiography.
Usually you have to "prepare" the exposure which charges some capacitors, and then that hv pulse is generated within the selected parameters.
Also, if you want the system to generate this voltage you'll probably have to fake a current, the filament current, which is a wound coil found inside the tube.
Lastly, dont open the HV tank, as it either will contain nasty oil or nastier Sulfur hexafluoride.