A rotating anode x−ray generator has been constructed of simplified design, with the elimination of unnecessary complexities. The design incorporates magnetic fluid ’’Ferrofluidic’’ vacuum seals and Wilson water seals. The rotor is 10 cm diam and the tube body is 5 cm wide. The tube is demountable at several points for easy replacement of rotor and cathode assemblies. The complete unit is contained within a framework 1.52×0.61 m.