Mechanisms of Edge-Localized-Mode Mitigation by External-Magnetic-Field Perturbations

Journal Article · Fri Mar 02 04:00:00 EST 2007 · Physical Review Letters

DOI:https://doi.org/10.1103/PHYSREVLETT.98.095001· OSTI ID:20957702

Tokar, M Z; Gupta, A; Wolf, R C ^[1]; Evans, T E ^[2]; Singh, R; Kaw, P ^[3]

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1. Institut fuer Plasmaphysik, Forschungszentrum Juelich GmbH, Association FZJ-Euratom, 52425, Juelich (Germany)
2. General Atomics, San Diego, California 92186-5606 (United States)
3. Institute for Plasma Research, Bhat, Gandhinagar-382428 (India)

Particle and energy transport in the tokamak edge transport barrier is analyzed in the presence of magnetic field perturbations from external resonant coils. In recent experiments such coils have been verified as an effective tool for mitigation of the edge-localized modes of type I. The observed reduction of the density in plasmas of low collisionality is explained by the generation of charged particle flows along perturbed field lines. The increase of the electron and ion temperatures in the barrier is interpreted by the reduction of perpendicular neoclassical transport with decreasing density and nonlocality of parallel heat transport. The found modification of the pressure gradient implies the stabilization of ballooning-peeling MHD modes responsible for type I ELMs.

• OSTI ID: 20957702
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 9 Vol. 98; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
BALLOONING INSTABILITY
CHARGED PARTICLES
EDGE LOCALIZED MODES
ELECTRON TEMPERATURE
HEAT TRANSFER
ION TEMPERATURE
MAGNETIC FIELDS
MAGNETOHYDRODYNAMICS
MITIGATION
MODIFICATIONS
NEOCLASSICAL TRANSPORT THEORY
PERTURBATION THEORY
PLASMA
PRESSURE GRADIENTS
STABILIZATION
TOKAMAK DEVICES