Observation of reduced heat transport inside the magnetic island O point in the large helical device |
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Authors: | Inagaki S,Tamura N,Ida K,Nagayama Y,Kawahata K,Sudo S,Morisaki T,Tanaka K,Tokuzawa T LHD Experimental Group |
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Affiliation: | National Institute for Fusion Science, 322-6 Orhoshi-Cho, Toki-City, 509-5292 Japan. |
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Abstract: | Evidence for a reduction of heat transport inside the magnetic island O point is observed from the propagation of a cold pulse produced by a tracer encapsulated solid pellet in the Large Helical Device. A small peak and slow propagation of the cold pulse are observed inside the island. A significant result is that electron heat diffusivity inside the island is estimated to be 0.2 m(2)/s which is smaller than that outside the island by an order of magnitude. |
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