11. A cooling device for x-ray tubes in x-ray generators comprising a housing witha central receiving device for receiving an x-ray tube,
an inlet opening for supplying a gaseous cooling medium,
an outlet opening for discharging the gaseous cooling medium and
a gas-conducting channel, which extends between the inlet opening and the outlet opening,
wherein the gas-conducting channel is designed such that it guides the gaseous cooling medium directly past the high-voltage housing of the x-ray tube during operation, and
wherein the gas-conducting channel extends spirally in a radial direction around the x-ray tube, with the result that the electric potential applied to the x-ray tube drops to zero potential along the gas-conducting channel.