General Electric Cgr S.a.

Francois Caire

Sixte De Fraguier

Gilles Lemestreallan

Catherine Thomas

Guillaume Fournier

Problems of thermal resistance both of the anode and of the cathode of an x-ray tube are solved by constructing a flat cathode which is set within a stair-step focusing device. It is shown that, depending on the shape of this device, the heat output on the anode is constant irrespective of the load on the x-ray tube.

X-ray tube having a variable focus which is self-adapted to the load

Problems of thermal resistance of the cathode of an x-ray tube are solved by constructing a flat cathode in the form of a hollow beam. This ensures rigidity of the cathode which is inherent in its beam shape without being attended by the disadvantages of excessive thermal inertia.

X-ray tube with a flat cathode and indirect heating

Problems of thermal resistance of the anode of an x-ray tube are solved by constructing a flat cathode which is set within a stair-step focusing device. It is shown that, depending on the shape of this device, the heat output on the anode is limited by a saturation value which is lower than a limit of thermal resistance of the x-ray tube. In order to improve the thermal resistance of the cathode, a cathode is constructed in the form of a hollow beam. This ensures rigidity of the cathode which is inherent in its beam shape without being attended by the disadvantages of excessive thermal inertia.

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Gagny, France

Francois Caire