Journal
NUCLEAR FUSION
Volume 58, Issue 10, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1741-4326/aad750
Keywords
slow relaxation; sawtooth; sawtooth; localized heating and current drive; tokamak
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Funding
- National Research Foundation of Korea [NRF-2017M1A7A1A03064231]
- National Fusion Research Institute (NFRI) under R&D Program of KSTAR Experimental Collaboration and Fusion Plasma Research
- BK21+ program
- National Research Foundation of Korea [2017M1A7A1A03064231] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Fast sawtooth crash of m = 1 mode (tens of mu s) is a common MHD phenomenon in the core of tokamak plasma. In KSTAR plasmas with localized heating and current drive close to the sawtooth inversion radius (rho(inv)), very slow sawtooth crashes are observed with time scales of a few ms. Scan of heating deposition along with power modulation revealed two different mechanisms of the slow crash with the help of detailed 2D imaging diagnostics. The slow crash appears with slow heat transport of the remained m = 1 mode after the partial crash of outer multiple m/n = 1 modes, or with the growth of an island formed on rho(inv) when the heating deposition locates just inside rho(inv) or just outside rho(inv). In the heating power modulation experiment, the slow crash with the island was sustained for the redistribution time scale of the driven current by a very short blip of heating.
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