High heat flux experiments at JAERI

Recent R&D results on high-heat flux components are presented, including construction of a new test stand. The test stand can extract an electron beam of 4.1 at 100 keV. E-folding divergence of the beam is 1.7 mrad, and the latest beam performance is also described. At the original test stand, which can produce hydrogen-ion beams of 50 A at 100 keV for 10 s, high-Z divertor armors, were tested. Tungsten plates brazed on copper blocks have been proven to have enough durability against heat flux under 10 MW/m/sup 2/. Carbon-fiber-carbon (CFC) composites were tested at the new electron-beam test stand and an electron-beam welding machine. Under disruption-simulation conditions, evaporation weight loss of CFC was lower than that of isotropic graphite.<
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