Stochastic fluctuation and transport of tokamak edge plasmas with the resonant magnetic perturbation field
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- Korea Institute of Fusion Energy, Daejeon (Korea, Republic of)
- Korea Institute of Fusion Energy, Daejeon 34133, Republic of Korea
- Pohang University of Science and Technology (POSTECH) (Korea, Republic of)
- Princeton University, NJ (United States)
- Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)
- Ulsan National Institute of Science and Technology (UNIST), Ulsan (Korea, Republic of)
Here we present that a statistical method known as the complexity–entropy analysis is useful to characterize a state of plasma turbulence and flux in the resonant magnetic perturbation (RMP) edge localized mode (ELM) control experiment. The stochastic pedestal top temperature fluctuation in the RMP ELM suppression phase is distinguished from the chaotic fluctuation in the natural ELM-free phase. It is discussed that the stochastic temperature fluctuation can be originated from the narrow layer of the field penetration on the pedestal top. The forced magnetic island can emit the resonant drift wave of comparable sizes (relatively low-k) in the RMP ELM suppression phase, and it can result in the generation of stochastic higher wavenumber fluctuations coupled to tangled fields around the island. The analysis of the ion saturation current measurement around the major outer striking point on the divertor shows that it also becomes more stochastic as the stronger plasma response to the RMP field is expected.
- Research Organization:
- Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)
- Sponsoring Organization:
- USDOE; Korea Institute of Fusion Energy (KFE)
- Grant/Contract Number:
- AC02-09CH11466; EN2201–13; EN2241–8
- OSTI ID:
- 1963017
- Journal Information:
- Physics of Plasmas, Vol. 29, Issue 12; ISSN 1070-664X
- Publisher:
- American Institute of Physics (AIP)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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