Direct multiscale coupling of a transport code to gyrokinetic turbulence codes

Barnes, M.; Abel, I. G.; Dorland, W.; Görler, T.; Hammett, G. W.; Jenko, F.

doi:doi:10.1063/1.3323082

Volume/Page
Keyword
DOI
Citation
Advanced

Volume: Page/Article:

Search Content Type

article doi:

Citation:

Mechanisms for generating toroidal rotation in tokamaks without external momentum input

Recent experiments on DIII-D [ J. L. Luxon, Nucl. Fusion 42, 614 (2002) ] and National Spherical Torus Experiment (NSTX) [ M. Ono et al., Nucl. Fusion 40, 557 (2000) ] have focused on investigating mechanisms of driving rotation in fusion plasmas. The so-called intrinsic rotation is generated by an effective torque, driven by residual stresses in the plasma, which appears to originate in the plasma edge. A clear scaling of this intrinsic drive with the H-mode pressure gradient is observed. Coup...

Islands in the stream: The effect of plasma flow on tearing stability

Reducing plasma flow clearly decreases the stability of tearing modes in multiple regimes (sawtooth, hybrid) in both high- and low-aspect-ratio tokamaks (DIII-D [ J. L. Luxon, Nucl. Fusion 42, 614 (2002) ], Joint European Torus [ M. Keilhacker and the JET Team, Plasma Phys. Controlled Fusion 41, 301 (1999) ], National Spherical Torus Experiment [ M. Ono, S. M. Kaye, Y.-K. M. Peng, Nucl. Fusion 40, 557 (2000) ], each with distinct means of lessening rotation). Further, reducing flow makes pre-ex...

Direct coupling between a transport solver and local, nonlinear gyrokinetic calculations using the multiscale gyrokinetic code TRINITY [ M. Barnes, “TRINITY: A unified treatment of turbulence, transport, and heating in magnetized plasmas,” Ph.D. thesis, University of Maryland, 2008 (eprint arXiv:0901.2868) ] is described. The coupling of the microscopic and macroscopic physics is done within the framework of multiscale gyrokinetic theory, of which we present the assumptions and key results. An assumption of scale separation in space and time allows for the simulation of turbulence in small regions of the space-time grid, which are embedded in a coarse grid on which the transport equations are implicitly evolved. This leads to a reduction in computational expense of several orders of magnitude, making first-principles simulations of the full fusion device volume over the confinement time feasible on current computing resources. Numerical results from TRINITY simulations are presented and compared with experimental data from JET [ M. Keilhacker, Plasma Phys. Controlled Fusion 41, B1 (1999) ] and ASDEX Upgrade [ O. Gruber, Nucl. Fusion 47, S622 (2007) ] plasmas.

Article Outline

INTRODUCTION
THEORETICAL FRAMEWORK
NUMERICAL METHOD
1. Discretization of the transport equations
2. Schematic
SIMULATION RESULTS
CONCLUSIONS

RELATED DATABASES

To view database links for this article, you need to log in.

KEYWORDS and PACS

Keywords

plasma simulation, plasma transport processes, plasma turbulence

PACS

52.20.Hv

Atomic, molecular, ion, and heavy-particle collisions
52.35.Bj

Magnetohydrodynamic waves (e.g., Alfven waves)
52.65.-y

Plasma simulation

ARTICLE DATA

Digital Object Identifier

http://dx.doi.org/10.1063/1.3323082

PUBLICATION DATA

ISSN

1070-664X (print)

1089-7674 (online)

Publisher

$abstract.society.value is a Member of CrossRef

American Institute of Physics

For access to citing articles, you need to log in.

Figures (13) Tables (2)

Access to article objects (figures, tables, multimedia) requires a subscription; log in to view available files.
(Access to supplementary files, where available, is free for this journal.)