The EPED pedestal model and edge localized mode-suppressed regimes: Studies of quiescent H-mode and development of a model for edge localized mode suppression via resonant magnetic perturbations

被引：153

作者：

Snyder, P. B. ^{[1
]}

Osborne, T. H. ^{[1
]}

Burrell, K. H. ^{[1
]}

Groebner, R. J. ^{[1
]}

Leonard, A. W. ^{[1
]}

Nazikian, R. ^{[2
]}

Orlov, D. M. ^{[3
]}

Schmitz, O. ^{[4
]}

Wade, M. R. ^{[1
]}

Wilson, H. R. ^{[5
]}

机构：

[1] Gen Atom Co, San Diego, CA 92186 USA

[2] Princeton Plasma Phys Lab, Princeton, NJ 08543 USA

[3] Univ Calif San Diego, La Jolla, CA 92093 USA

[4] Forschungszentrum Julich, Inst Plasmaphys, Assoc FZJ EURATOM, D-52425 Julich, Germany

[5] Univ York, Dept Phys, York Plasma Inst, York YO10 5DD, N Yorkshire, England

来源：

PHYSICS OF PLASMAS | 2012年 / 19卷 / 05期

基金：

英国工程与自然科学研究理事会;

关键词：

MAGNETOHYDRODYNAMIC STABILITY; TRANSPORT; MICROTURBULENCE; INSTABILITIES; SIMULATIONS; MECHANISMS; ELMS;

D O I：

10.1063/1.3699623

中图分类号：

O35 [流体力学]; O53 [等离子体物理学];

学科分类号：

070204 ; 080103 ; 080704 ;

摘要：

The EPED model predicts the H-mode pedestal height and width based upon two fundamental and calculable constraints: (1) onset of non-local peeling-ballooning modes at low to intermediate mode number, (2) onset of nearly local kinetic ballooning modes at high mode number. We present detailed tests of the EPED model in discharges with edge localized modes (ELMs), employing new high resolution measurements, and finding good quantitative agreement across a range of parameters. The EPED model is then applied for the first time to quiescent H-mode (QH), finding a similar level of agreement between predicted and observed pedestal height and width, and suggesting that the model can be used to predict the critical density for QH-mode operation. Finally, the model is applied toward understanding the suppression of ELMs with 3D resonant magnetic perturbations (RMP). Combining EPED with plasma response physics, a new working model for RMP ELM suppression is developed. We propose that ELMs are suppressed when a "wall" associated with the RMP blocks the inward penetration of the edge transport barrier. A calculation of the required location of this "wall" with EPED is consistent with observed profile changes during RMP ELM suppression and offers an explanation for the observed dependence on safety factor (q(95)). (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.3699623]

引用

页数：9

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