The Input Power Limit of the Cylindrical Rotating Anode of a X-ray Tube

The permissible maximum input power of the cylindrical anode of a continuous operating X-ray tube was calculated. Calculation was done for the cyclic dynamical steady state which was realized after sufficiently long continuous operation. This thermal problem was treated by DuMond as a one-dimensional problem in which heat flow was normal to the surface of the target. In our case a focus of an electron beam was a line focus and the width was small compared with the thickness of the target and the problem was treated as a two-dimensional problem containing transversal thermal flow.