Article

Reduced critical rotation for resistive-wall mode stabilization in a near-axisymmetric configuration.

Columbia University, New York, New York 10027, USA.
Physical Review Letters (impact factor: 7.37). 03/2007; 98(5):055001. pp.055001
Source: PubMed

ABSTRACT 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 Alfvén 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.

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Keywords

apply nonaxisymmetric magnetic fields
 
C VI
 
charge exchange recombination spectroscopy
 
consistent
 
ideal MHD no-wall stability limit
 
kinetic model
 
minimum nonaxisymmetric perturbations
 
neutral beam torque
 
plasma pressure
 
plasma rotation
 
resistive-wall mode
 
slow
 
toroidal plasma rotation
 

H. Reimerdes