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The Large Helical Device is the world's largest heliotron/stellarator as well as the largest superconducting fusion device. Its construction started in 1990, and the plasma experiments started in March 1998 as planned, owing to strongly supported by concentrated R&D activities for superconducting magnets, heating devices and diagnostics. In 15 years since the initial operation, considerable efforts...
This paper presents recent experimental results in the Large Helical Device (LHD), which is the world largest helical system (Rax~3.6 m, aav~0.6 m, Bax~2.75 T) and has capability of steady state operation because of the superconducting magnets. LHD confines the plasma with Tio~2 keV and ne ~0.8times1019 m-3 for 1905 sec using the ICRF heating. In this case, the total plasma heating energy was ~1.3...
A local island divertor (LID) experiment has begun on LHD, with the aims of controlling edge recycling and improving the plasma confinement. The fundamental divertor functions of the LID have been demonstrated in the recent experiments. From the particle flux profile measurements on the LID head it was found that the particles diffusing out from the core region are well guided along the island separatrix...
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