Component or electron capture sleeve for an X-ray tube and X-ray tube having such a device

An apparatus comprising:

• a component part suitable for implementation in a vacuum area of an X-ray tube with an opening through which an electron beam is guided, the component part including:
• a beam tube for directing the electron beam to a target;
• a base body made of a first material, wherein the first material is a metal;
• wherein arranged on an interior surface forming the opening, is a second material having an atomic number which is smaller than an atomic number of the first material;
• and the apparatus further comprising:
• a target support attached to an end of the component part, the target support supporting the target which is aligned with a lens diaphragm formed at an end of the beam tube, the target support having a second base body made of the first material, and the second material being formed on a surface of the second base body that is selectively exposed to the electron beam and which extends between the target and the lens diaphragm.