Abstract: An x-ray tube (10) includes an anode (16), a cylindrical stem (22), and a rotor (24). The rotor (24) includes a cylindrical sleeve portion (32) and a head portion (34) which are joined together at a joint (36). The joint (36) is formed by a mating of a lip (46) in the sleeve portion (32) and a lip (48) in the head portion (34). The lip (48) of the head portion (34) fits about the lip (46) of the sleeve portion (32). The sleeve portion (32) is formed of a first material and the head portion (34) is formed of a second material, the first material having a thermal expansion coefficient greater than that of the second material such that the head portion (34) expands less than the sleeve portion (32) upon heating and thereby maintains the integrity of the joint (36) inasmuch as the head portion (34) overlaps the sleeve portion ( 32) in the region of the joint (36). The stem (22) is attached to the anode (16) at a first end (50) and attached to the head portion (34) at a second end (52).

Abstract: An X-ray generator system comprising a pressurized fluid source disposed for directing dielectric coolant fluid through a housing wherein an X-ray source may be electrically connected for generating X-rays, the system including a venturi device having a restricted passage through which the fluid flows and which is disposed in communication with portions of the housing where gas bubbles may accumulate in the fluid. Thus, the fluid flowing through the restricted passage of the venturi device produces a reduction in pressure which draws fluid from said portions of the housing so that any gas bubbles accumulated therein may be purged from the system.