X-ray target assembly, X-ray anode assembly and X-ray tube apparatus

X-ray target assembly comprising

• a base, and
• a multilayered X-ray target that comprises at least a heat transfer layer, an X-ray source layer and an adhesion layer provided between the heat transfer layer and the X-ray source layer,
• wherein the X-ray target is oriented such that the heat transfer layer is closest to the base,
• wherein the X-ray target is placed on top of a carrying element, wherein the in-plane coefficient of thermal expansion of each of the heat transfer layer, the X-ray source layer, the adhesion layer and of the material of the carrying element is different, wherein the in-plane coefficient of thermal expansion of the material of the carrying element the highest,
• wherein the carrying element featuring a height DH and a diameter DD is attached to the base and positioned between the base and the heat transfer layer, wherein the diameter DD of the carrying element is smaller than a diameter BD of the base, wherein the ratio R of the height DH over the diameter DD of the carrying element is larger than or equal to 0.1 and smaller than or equal to 0.2, and wherein a diameter TD of the X-ray target is substantially equal to the diameter DD of the carrying element.