To suppress the temperature rise by a thermal load at the surface of a carbon protective plate which is formed as a beam facing surface as a countermeasure against erosion by joining a metallic heat sink to the rear surface of the protective plate.
It is preferable to use a metallurgical method at the time of joining 2 a metallic heat sink 3 to the rear surface of the carbon protective plate (carbon plate) 1 which is formed as a beam facing surface. It is also preferable to use brazing which can join the heat sink 3 to the rear surface of the plate 1 at a low temperature. A brazing material composed of Ag, Ag and Cu, Pd, Pd and AG, etc., is used for the brazing. It is also preferable to add an active metal, such as Ti, Zr, Hf, Be, W, V, Nb, Ta, etc., to the brazing material, because the wettability of the brazing material is improved. The metal used for making the heat sink 3 includes Cu, a Cu alloy, aluminum, an aluminum alloy, stainless steel, etc.
SUZUKI TAKAYUKI
HYAKKI YASUO
NAKAYAMA KENICHI
