2003
DOI: 10.1088/0029-5515/43/6/306
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Resistive wall stabilization of high-beta plasmas in DIII–D

Abstract: Abstract. Recent DIII-D experiments show that ideal kink modes can be stabilized at high beta by a resistive wall, with sufficient plasma rotation. However, the resonant response by a marginally stable resistive wall mode to static magnetic field asymmetries can lead to strong damping of the rotation. Careful reduction of such asymmetries has allowed plasmas with beta well above the ideal MHD nowall limit, and approaching the ideal-wall limit, to be sustained for durations exceeding one second. Feedback contro… Show more

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Cited by 93 publications
(125 citation statements)
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References 23 publications
(34 reference statements)
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“…These results represent a factor of 3-4 increase in duration of sustained beta above the n=1 no-wall limit relative to performance prior (shown in red) to improvements in plasma shaping [42] and error field correction and mode control, and a factor of 2 increase in duration above the no-wall limit relative to plasmas including improved shaping but without error field correction and mode control [41,42]. Thus, control of the resonant field amplification and resistive wall modes is a very important tool for performance optimization in NSTX as previously observed in high-beta conventional aspect ratio tokamaks [46,47].…”
Section: Low-β Locked-mode Threshold Scalingsmentioning
confidence: 88%
“…These results represent a factor of 3-4 increase in duration of sustained beta above the n=1 no-wall limit relative to performance prior (shown in red) to improvements in plasma shaping [42] and error field correction and mode control, and a factor of 2 increase in duration above the no-wall limit relative to plasmas including improved shaping but without error field correction and mode control [41,42]. Thus, control of the resonant field amplification and resistive wall modes is a very important tool for performance optimization in NSTX as previously observed in high-beta conventional aspect ratio tokamaks [46,47].…”
Section: Low-β Locked-mode Threshold Scalingsmentioning
confidence: 88%
“…We have also found that fixed and free boundary modes for n = 2 and 3 are stable in DCON. This is not surprising since the β N for this dual equilibrium is 4.6, a value yielding stable plasmas in some finite aspect ratio machines [14].…”
mentioning
confidence: 83%
“…As in the DIII-D C-Coil [11], the proposed RWM Coil can be operated in a duplex fashion to both correct "dc" error field and to feedback stabilize "ac" RWMs.…”
Section: −1mentioning
confidence: 99%