X-ray radiator

An X-ray radiator, comprising:

• an evacuated X-ray tube housing rotatably mounted about a rotation axis, the evacuate X-ray tube housing including an anode and an electron source, the anode being arranged within the evacuated X-ray tube housing non-rotatably relative to the evacuated X-ray tube housing, and the anode being configured to generate X-ray radiation via electrons impacting a focal spot of the anode, and the electron source being mounted substantially stationary within the evacuated X-ray tube housing relative to the rotation axis,
• wherein the electron source includes
• a main emitter, and
• at least one subsidiary emitter to emit electrons, and
• wherein an electron emission of at least one of the main emitter or the at least one subsidiary emitter is controllable to reduce a spatial movement of the focal spot due to a movement of the electron source, the spatial movement of the focal spot being reduced without use of a deflection unit to deflect the electrons of the electron emission.