Magnetohydrodynamic stability of tokamak edge plasmas

Connor, J. W.; Hastie, R. J.; Wilson, H. R.; Miller, Robert L.

doi:10.1063/1.872956

Cited by 429 publications

(554 citation statements)

References 17 publications

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“…Connor, Hastie & Wilson 1998) and resulting in expulsion of the hot H-mode pedestal plasma into the SOL and further down to the divertor volume. In the double-null divertor configuration most of this plasma goes into the outer divertor (Counsell et al 2002;Petrie et al 2003).…”

Section: Drifts and Electric Currentsmentioning

confidence: 99%

Physics of ultimate detachment of a tokamak divertor plasma

Krasheninnikov¹,

2017

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The basic physics of the processes playing the most important role in divertor plasma detachment is reviewed. The models used in the two-dimensional edge plasma transport codes that are widely used to address different issues of the edge plasma physics and to simulate the experimental data, as well as the numerical schemes and convergence issues, are described. The processes leading to ultimate divertor plasma detachment, the transition to and the stability of the detached regime, as well as the impact of the magnetic configuration and divertor geometry on detachment, are considered. A consistent, integral physical picture of ultimate detachment of a tokamak divertor plasma is developed.

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Section: Drifts and Electric Currentsmentioning

confidence: 99%

Physics of ultimate detachment of a tokamak divertor plasma

Krasheninnikov¹,

2017

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“…During H-modes, large edge pressure and current gradients in toroidal fusion devices are thought to drive transient instabilities known as edge localized modes (ELMs) [1]. Numerical simulations have identified peeling and/or ballooning modes as candidate instabilities generating filamentary structures that burst outward across flux surfaces during periodic non-linear growth phases [2,3].…”

Section: Introductionmentioning

confidence: 99%

Transition to ELM-free improved H-mode by lithium deposition on NSTX graphite divertor surfaces

Mansfield

Kugel

Maingi

et al. 2009

Journal of Nuclear Materials

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a b s t r a c tLithium evaporated onto plasma facing components in the NSTX lower divertor has made dramatic improvements in discharge performance. As lithium accumulated, plasmas previously exhibiting robust Type 1 ELMs gradually transformed into discharges with intermittent ELMs and finally into continuously evolving ELM-free discharges. During this sequence, other discharge parameters changed in a complicated manner. As the ELMs disappeared, energy confinement improved and remarkable changes in edge and scrape-off layer plasma properties were observed. These results demonstrate that active modification of plasma surface interactions can preempt large ELMs.

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“…In the ELMy H mode, the thermal energy is released in a highly transient, episodic way, and the induced heat load may erode plasma facing components and degrade performance. ELM physics, especially the presumed underlying instability mechanism (i.e., the PB mode), has been studied extensively [4]. PB modes are ideal MHD instabilities which couple magnetic curvature (i.e., ballooning) drive and current gradient drive (i.e., kink).…”

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confidence: 99%

From Phase Locking to Phase Slips: A Mechanism for a QuiescentHmode

Guo

Diamond

2015

Phys. Rev. Lett.

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We demonstrate that E × B shear, V 0 E×B , governs the dynamics of the cross phase of the peelingballooning-(PB-)mode-driven heat flux, and so determines the evolution from the edge-localized (ELMy) H mode to the quiescent (Q) H mode. A physics-based scaling of the critical E × B shearing rate (V 0 E×B;cr ) for accessing the QH mode is predicted. The ELMy H mode to the QH-mode evolution is shown to follow from the conversion from a phase locked state to a phase slip state. In the phase locked state, PB modes are pumped continuously, so bursts occur. In the slip state, the PB activity is a coherent oscillation. Stronger E × B shearing implies a higher phase slip frequency. This finding predicts a new state of cross phase dynamics and shows a new way to understand the physics mechanism for ELMy to the QH-mode evolution.

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Magnetohydrodynamic stability of tokamak edge plasmas

Cited by 429 publications

References 17 publications

Physics of ultimate detachment of a tokamak divertor plasma

Physics of ultimate detachment of a tokamak divertor plasma

Transition to ELM-free improved H-mode by lithium deposition on NSTX graphite divertor surfaces

From Phase Locking to Phase Slips: A Mechanism for a QuiescentHmode

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