Patent Number: 
Section: claims

1. A first-wall component of a fusion reactor, comprising:at least one heat shield of a graphitic material formed with a closed or open passage;a cooling tube of copper or a copper alloy;a tube segment disposed between said heat shield and said cooling tube, said tube segment consisting of a material selected from the group consisting of molybdenum, molybdenum alloy, tungsten and tungsten alloy, and said tube segment being formed with an opening facing towards a surface of said heat shield exposed to a plasma and having an opening angle α of from 20 to 180°; andcopper-containing layers connecting said tube segment to said heat shield and to said cooling tube. 2. The first-wall component according to claim 1, wherein said opening angle α of said tube segment is 50° to 130°. 3. The first-wall component according to claim 1, wherein an angle bisector of said opening angle α is perpendicular to the surface of said heat shield exposed to a plasma. 4. The first-wall component according to claim 1, wherein said tube segment has a wall thickness of from 0.2 to 1.5 mm. 5. The first-wall component according to claim 1, wherein said heat shield is connected in a region of an opening of said tube segment to said cooling tube via a copper-containing region. 6. The first-wall component according to claim 1, wherein said tube segment consists of Mo—Cu or W—Cu. 7. The first-wall component according to claim 1, wherein said heat shield consists substantially of carbon fiber-reinforced carbon. 8. The first-wall component according to claim 1, wherein said cooling tube consists of Cu—Cr—Zr. 9. The first-wall component according to claim 1, wherein said passage is a bore. 10. The first-wall component according to claim 1, wherein said passage is a laser-structured opening. 11. The first-wall component according to claim 1, wherein said passage has a wall formed of a titanium carbide layer. 12. A first-wall component of a fusion reactor, comprising:a heat shield of a graphitic material formed with a closed or open passage;a cooling tube of copper or a copper alloy;a tube segment disposed between said heat shield and said cooling tube, said tube segment having an opening with an opening angle α of from 20 to 180°; andcopper-containing layers connecting said tube segment to said heat shield and to said cooling tube. 13. The first-wall component according to claim 12, wherein said heat shield is connected in a region of said opening of said tube segment to said cooling tube via a copper-containing region.