Plasma shaping, edge ballooning stability and ELM behaviour in DIII-D

Ozeki, T.; Chu, M. S.; Lao, L. L.; Taylor, T.S.; Chance, M. S.; Kinoshita, Shigeyoshi; Burrell, K.H.; Stambaugh, R.D.

doi:10.1088/0029-5515/30/8/003

Cited by 127 publications

(123 citation statements)

References 15 publications

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“…Type I ELMs are thought to occur near the ideal first stability limit, increase in frequency with P NBI , and typically cause a ~ 5-10% reduction in stored energy. Type II ELMs are observed 24 …”

Section: Elmsmentioning

confidence: 99%

Observation of a high performance operating regime with small edge-localized modes in the National Spherical Torus Experiment

et al. 2005

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We report observation of a high performance scenario in the National Spherical Torus Experiment with very small edge-localized modes (ELMs). These ELMs have no measurable impact on stored energy and are consistent with high bootstrap current operation with line average density approaching Greenwald scaling. The ELM perturbation is observed to typically originate near the lower divertor region, as opposed to the outer midplane for ELMs described in the literature. If extrapolable, this scenario would provide an attractive operating regime for next step fusion experiments.2 Introduction -The desire for high performance operating regimes with few or no

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Section: Elmsmentioning

confidence: 99%

Observation of a high performance operating regime with small edge-localized modes in the National Spherical Torus Experiment

et al. 2005

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“…16). Heat flux Lao (1989); Ozeki (1989) Distance from Separatrix (m) to the divertor tiles is measured by an IR TV camera system [Hill (1988)], sensitive to radiation in the 8-12 p range. With the ion VB direction pointing towards the X-point, more heat flows to the outer intercept.…”

Section: Divertor and Edge Physicsmentioning

confidence: 99%

Recent results from DIII-D and their implications for next generation tokamaks

Luxon

Bramson

Burrell

et al. 1990

Plasma Phys. Control. Fusion

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Recent results from the DIII-D tokamak have provided significant contributions to the understanding of many of the elements 0: tokamak physics and the application of this understanding to the design of next generation devices including ITER and CIT. The limitations of magnetohydrodynamic stability on the values of plasma beta (the ratio of kinetic pressure to the containing pressure of the magnetic field) that can be attained has been experimentally demonstrated and found to be described by existing theory. Values of beta (10.7% well in excess of those required for

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“…22͒ groups, various small ELM regimes at JT-60U, 23,24 ASDEX-U, 25 NSTX, 26,27 JET, 28 C-Mod, 29 JFT-2M, 30,31 Compass-D ͑Ref. 32͒ and DIII-D, 33 and ELM-free operation in the QH-mode. [34][35][36][37][38][39] Pioneering work on the effect of edge stochastic fields in circular limited plasmas was done by the TEXT group, [40][41][42][43] by the Tore-Supra group ͑Refs.…”

Section: Introductionmentioning

confidence: 99%

Effect of island overlap on edge localized mode suppression by resonant magnetic perturbations in DIII-D

Fenstermacher¹,

Evans²,

Osborne³

et al. 2008

Physics of Plasmas

150

230

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Recent DIII-D [J. L. Luxon et al., Nucl. Fusion 43, 1813 (2003)] experiments show a correlation between the extent of overlap of magnetic islands induced in the edge plasma by perturbation coils and complete suppression of Type-I edge localized modes (ELMs) in plasmas with ITER-like electron pedestal collisionality νe*∼0.1, flux surface shape and low edge safety factor (q95≈3.6). With fixed amplitude n=3 resonant magnetic perturbation (RMP), ELM suppression is obtained only in a finite window in the edge safety factor (q95) consistent with maximizing the resonant component of the applied helical field. ELM suppression is obtained over an increasing range of q95 by either increasing the n=3 RMP strength, or by adding n=1 perturbations to “fill in” gaps between islands across the edge plasma. The suppression of Type-I ELMs correlates with a minimum width of the edge region having magnetic islands with Chirikov parameter >1.0, based on vacuum calculations of RMP mode components excluding the plasma response or rotational shielding. The fraction of vacuum magnetic field lines that are lost from the plasma, with connection length to the divertor targets comparable to an electron-ion collisional mean free path, increases throughout the island overlap region in the ELM suppressed case compared with the ELMing case.

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Plasma shaping, edge ballooning stability and ELM behaviour in DIII-D

Cited by 127 publications

References 15 publications

Observation of a high performance operating regime with small edge-localized modes in the National Spherical Torus Experiment

Observation of a high performance operating regime with small edge-localized modes in the National Spherical Torus Experiment

Recent results from DIII-D and their implications for next generation tokamaks

Effect of island overlap on edge localized mode suppression by resonant magnetic perturbations in DIII-D

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