X-ray tube device and x-ray CT apparatus

An X-ray tube device comprising:

• an X-ray tube including an envelope that holds, in a vacuum, a cathode generating an electron beam and an anode emitting an X-ray by collision of the electron beam, and an X-ray window through which the X-ray is transmitted;
• a stator coil configured to generate a driving force for rotating the anode;
• a tube container configured to accommodate the X-ray tube and the stator coil together with insulating oil;
• and
• a cooler configured to cool the insulating oil,
• wherein the X-ray tube device includes
• a first inflow port connected to a pipe linking the tube container and the cooler and disposed near the X-ray window,
• a second inflow port connected to the pipe and disposed near the stator coil, and
• a controller configured to:
• cause the insulating oil to flow into the tube container through the first inflow port in a case where the X-ray is emitted,
• cause the insulating oil to flow out from the tube container through the second inflow port in a case where the X-ray is emitted,
• cause the insulating oil to flow into the tube container through the second inflow port in a case where the X-ray is not emitted, and
• cause the insulating oil to flow out from the tube container through the first inflow port in a case where the X-ray is not emitted.