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- Title
Origin of the Gap Between Theoretical Model and Experimental Results of the MHD Instabilities in Fusion Plasma Physics.
- Authors
Park, Hyeon K.
- Abstract
The theory and modeling of the complex dynamics of high temperature plasma in tokamak devices must be validated against precise measurements with comprehensive visualization diagnostics so that fully validated modelling can be used for stable operation of the plasmas. A new and advanced two-dimension (2-D) electron cyclotron emission imaging (ECEi) system was developed for this need. Through comparative studies with the newly uncovered physics from the ECEi system, theoretical models either have gained high confidence or have substantially improved. For the sawtooth instability, the long discarded, full reconnection model has been vindicated and axisymmetry of the 1/1 kink mode right before the crash time is critical for and may have relevancy to the violent kink instability of magnetic filament ropes in a solar flare. For the neoclassical tearing mode (NTM) instability, the 2-D ECEi data can determine the critical parameters such as Δ' and ωc with high confidence. The observed anisotropic distribution of the turbulence and flow in the presence of the 2/1 island is validated by the modelled potential and gyro-kinetic calculation of the turbulence. In a study of the edge localized mode (ELM), validation of the ELM structure and the dynamics of the ELM-crash cycle have provided an opportunity to improve the theoretical model. The dynamics of a broadband turbulence induced by the resonant magnetic perturbation (RMP) in ELM-crash suppression experiments may shed light on the physics of coupling between the broadband turbulence and ELMs, growth/decay of the ELMs and enhanced transport at the pedestal region.
- Subjects
PLASMA physics; HIGH temperature plasmas; PLASMA instabilities; MAGNETOHYDRODYNAMIC instabilities; TOKAMAKS; SOLAR filaments; PLASMA turbulence
- Publication
AAPPS Bulletin, 2020, Vol 30, Issue 6, p76
- ISSN
0218-2203
- Publication type
Article
- DOI
10.22661/AAPPSBL.2020.30.6.76