Abstract: An x-ray apparatus has a cooling device for cooling of the anode, through which cooling device cooling fluid flows. To improve the cooling effect, the coolant is water and a pressure generation device is provided for generation of a water pressure of more than 1.1 bar acting at least in a region of the anode to be cooled.

Abstract: An x-ray radiator has a vacuum housing that can rotate around an axis, a cathode that thermionically emits electrons upon irradiation thereof by a laser beam, an anode that emits x-rays upon being struck by the electrons, an insulator that is part of the vacuum housing and that separates the cathode from the anode, electrodes or terminals to apply a high voltage between the anode and the cathode to accelerate the emitted electrons toward the anode to form an electron beam, a drive arrangement for rotation of the vacuum housing around its axis, an arrangement for cooling components of the x-ray radiator, and an arrangement that directs and focuses the laser beam from a stationary source that is arranged outside of the vacuum housing onto a spatially stationary laser focal spot on the cathode.

Abstract: A rotating envelope radiator has a radiator housing surrounded by an external housing to form an intervening space in which a coolant flows. To prevent the formation, at high rotational frequencies, of reverse flows of the coolant in the intervening space, a flow conductor structure is provided in the intervening space that counteracts the formation of tangential flow components in the coolant.

Abstract: In a method for vapor-depositing a substrate with a layer of a needle-shaped x-ray fluorescent material containing at least one alkali metal, alkali halogenide phases and an alkali halogenide are mixed in a vapor phase and are vapor-deposited on the substrate. A needle-shaped fluorescent material is thereby produced having the formula ( ( M ? + ? H ? - ) a ? ( M ?? + ? H ?? - ) ( 1 - a ) ) k ? : ? ? ? ( M x ? + ? S y z + ? H x ? - ? H z * ? y ??? - ) b ? ( M x ?? + ? S y z + ? H x ?? - ? H z * ? y ??? - ) c ? ( M x ? + ? S y z + ? H x ?? - ? H z * ? y ??? - ) d ? ( M x ?? + ? S y z + ? H x ? - ? H z * ? y ??? - ) e wherein M+ is at least one metal ion from the group Na, K, Rb and Cs, H? is at least one halogenide from the group F, Cl, Br and I and Sz+ is at least one lanthanide ion from the group La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb or Lu.

Abstract: A high-performance anode plate for a directly cooled rotary piston x-ray tube is formed of a high-temperature-resistant material such as tungsten, molybdenum or a combination of both materials. In the region of the focal spot path, the underside of the anode plate is shaped, and/or in this region a different highly heat-conductive material is inserted or applied, such that an improved heat dissipation and thus a lower temperature gradient results.

Abstract: A method forms a vapor-deposit layer of needle-shaped x-ray luminophore containing at least one alkali metal doped with europium on a carrier. The method includes placing a mixture of Eu3O4Hal and at least one alkali halogenide in a molybdenum vaporizer, heating the mixture to simultaneously vaporize the mixture and to deposit it on a carrier, wherein Hal is at least one halogenide from a group consisting of F, Cl, Br and I. The ratio of the Eu concentration of the alkali halogenide layer in the proximity of the substrate to the Eu concentration of the alkali halogenide layer in the proximity of the surface can preferably be reproduced with a factor of 0.4 to 1.2, and preferably between 0.6 and 0.8.