Reduced Critical Rotation for Resistive-Wall Mode Stabilization in a Near-Axisymmetric Configuration

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

DOI:https://doi.org/10.1103/PHYSREVLETT.98.055001· OSTI ID:20955428

Reimerdes, H; Garofalo, A M; Lanctot, M J; Navratil, G A ^[1]; Jackson, G L; Strait, E J; Chu, M S; La Haye, R J; Groebner, R J ^[2]; Okabayashi, M; Solomon, W M; Takahashi, H ^[3]; In, Y ^[4]; Liu, Y Q ^[5]

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1. Columbia University, New York, New York 10027 (United States)
2. General Atomics, San Diego, California 92186-5608 (United States)
3. Princeton Plasma Physics Laboratory, Princeton, New Jersey 08543-0451 (United States)
4. FARTECH, Inc., San Diego, California 92121 (United States)
5. Chalmers University of Technology, S-412 96 Goeteborg (Sweden)

Recent DIII-D experiments with reduced neutral beam torque and minimum nonaxisymmetric perturbations of the magnetic field show a significant reduction of the toroidal plasma rotation required for the stabilization of the resistive-wall mode (RWM) below the threshold values observed in experiments that apply nonaxisymmetric magnetic fields to slow the plasma rotation. A toroidal rotation frequency of less than 10 krad/s at the q=2 surface (measured with charge exchange recombination spectroscopy using C VI) corresponding to 0.3% of the inverse of the toroidal Alfven time is sufficient to sustain the plasma pressure above the ideal MHD no-wall stability limit. The low-rotation threshold is found to be consistent with predictions by a kinetic model of RWM damping.

• OSTI ID: 20955428
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 5 Vol. 98; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
AXIAL SYMMETRY
CHARGE EXCHANGE
CONFIGURATION
DOUBLET-3 DEVICE
MAGNETIC FIELDS
MAGNETOHYDRODYNAMICS
PLASMA
PLASMA PRESSURE
RECOMBINATION
ROTATION
SPECTROSCOPY
STABILIZATION
WALLS