Aspects of three dimensional transport for ELM control experiments in ITER-similar shape plasmas at low collisionality in DIII-D

被引：110

作者：

Schmitz, O. ^{[1
]}

Evans, T. E. ^{[2
]}

Fenstermacher, M. E. ^{[3
]}

Frerichs, H. ^{[1
]}

Jakubowski, M. W. ^{[4
]}

Schaffer, M. J. ^{[2
]}

Wingen, A. ^{[5
]}

West, W. P. ^{[2
]}

Brooks, N. H. ^{[2
]}

Burrell, K. H. ^{[2
]}

deGrassie, J. S. ^{[2
]}

Feng, Y. ^{[4
]}

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

Gohil, P. ^{[2
]}

Groth, M. ^{[3
]}

Joseph, I. ^{[3
]}

Lasnier, C. J. ^{[3
]}

Lehnen, M. ^{[1
]}

Leonard, A. W. ^{[2
]}

Mordijck, S. ^{[6
]}

Moyer, R. A. ^{[6
]}

Nicolai, A. ^{[1
]}

Osborne, T. H. ^{[2
]}

Reiter, D. ^{[1
]}

Samm, U. ^{[1
]}

Spatschek, K. H. ^{[5
]}

Stoschus, H. ^{[1
]}

Unterberg, B. ^{[1
,8
]}

Unterberg, E. A.

Watkins, J. G. ^{[7
]}

Wolf, R.

机构：

[1] Forschungszentrum Julich, IEF4 Plasmaphys, D-52425 Julich, Germany

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

[3] Lawrence Livermore Natl Lab, Livermore, CA USA

[4] Max Planck Inst Plasma Phys, Greifswald, Germany

[5] Univ Dusseldorf, ITP 1, D-40225 Dusseldorf, Germany

[6] Univ Calif San Diego, La Jolla, CA USA

[7] Sandia Natl Labs, Albuquerque, NM 87185 USA

[8] Oak Ridge Inst Sci Educ, Oak Ridge, TN USA

来源：

PLASMA PHYSICS AND CONTROLLED FUSION | 2008年 / 50卷 / 12期

关键词：

D O I：

10.1088/0741-3335/50/12/124029

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：

A study of three-dimensional (3D) perturbed magnetic field structures and transport for edge localized mode control experiments with resonant magnetic perturbations at DIII-D is presented. We focus on ITER-Similar Shape plasmas at ITER relevant electron pedestal collisionalities. nu(e)* similar to 0.2. This study is performed in comparison with results from TEXTOR-Dynamic Ergodic Divertor circular limiter plasmas. For both experiments the magnetic field structure is analyzed in the vacuum paradigm-superimposing the external RMP field on the unperturbed equilibrium. For TEXTOR L-mode plasmas this description holds for normalized poloidal flux Psi(N) > 0.7 without tearing modes driven by the RMP field. For DIII-D H-mode plasmas the validity of this approach still needs to be established. In this paper a method is discussed to diagnose the degree of edge stochastization based on a comparison between modeled magnetic footprints on the divertor targets and experimental data. Clear evidence is presented for the existence of a generic separatrix perturbation causing striation of target particle fluxes. However, heat fluxes into these striations are small. This observation can be explained by accounting for the different heat and particle source locations and the 3D trajectories of the open, perturbed field lines toward the divertor target. Analysis of the transport characteristics filling the perturbed separatrix lobes based on initial EMC3/EIRENE modeling suggests the existence of open field lines connecting the stochastic edge to the target pattern. However, the width and inward most extent of the actual stochastic layer cannot yet be quantified.

引用

页数：19

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