Journal
NUCLEAR FUSION
Volume 60, Issue 12, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1741-4326/abb2d6
Keywords
ELM crashes; non-linear energy transfer; three wave interaction; turbulence; beam emission spectroscopy; KSTAR
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Funding
- National R&D Program through the National Research Foundation of Korea (NRF) - Ministry of Science and ICT [NRF-2020M1A7A1A03016161, NRF-2017M1A7A1A01015892]
- National Research Foundation of Korea [2020M1A7A1A03016161, 2017M1A7A1A01015892] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Long ELMy H-mode KSTAR discharges are used to show that low frequencies (f less than or similar to 50 kHz) of the ion-scale density fluctuations contain electromagnetic components that transfer energy from f less than or similar to 15 kHz to higher frequency (15 kHz less than or similar to f less than or similar to 100 kHz) fluctuations during ELM crashes via three-wave non-linear interactions. Such non-linear interactions are not observed during the inter-ELM phases. These observations suggest that investigations on the enhanced fluctuation and transport levels during ELM crashes require a careful analysis of the non-linear couplings between low frequency electromagnetic and broadband fluctuations in addition to other causes such as open (stochastic) magnetic fields and (E) over right arrow x (B) over right arrow advective transport. Our results are based on conditionally ensemble-averaged second-order and third-order spectral analyses applied to 2, 660 ELMs obtained from three different KSTAR discharges to ensure statistical validity.
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