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Title: Stability of Microturbulent Drift Modes during Internal Transport Barrier Formation in the Alcator C-Mod Radio Frequency Heated H-mode

Abstract

Recent H-mode experiments on Alcator C-Mod [I.H. Hutchinson, et al., Phys. Plasmas 1 (1994) 1511] which exhibit an internal transport barrier (ITB), have been examined with flux tube geometry gyrokinetic simulations, using the massively parallel code GS2 [M. Kotschenreuther, G. Rewoldt, and W.M. Tang, Comput. Phys. Commun. 88 (1995) 128]. The simulations support the picture of ion/electron temperature gradient (ITG/ETG) microturbulence driving high xi/ xe and that suppressed ITG causes reduced particle transport and improved ci on C-Mod. Nonlinear calculations for C-Mod confirm initial linear simulations, which predicted ITG stability in the barrier region just before ITB formation, without invoking E x B shear suppression of turbulence. Nonlinear fluxes are compared to experiment, which both show low heat transport in the ITB and higher transport within and outside of the barrier region.

Authors:
; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Princeton Plasma Physics Lab., NJ (US)
Sponsoring Org.:
USDOE Office of Science (SC) (US)
OSTI Identifier:
820200
Report Number(s):
PPPL-3903
TRN: US0305718
DOE Contract Number:  
AC02-76CH03073
Resource Type:
Technical Report
Resource Relation:
Other Information: PBD: 20 Nov 2003
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; GEOMETRY; SHEAR; STABILITY; TEMPERATURE GRADIENTS; TRANSPORT; TURBULENCE; COMPUTATIONAL PHYSICS; COMPUTER SIMULATION; DRIFT WAVES

Citation Formats

Redi, M H, Fiore, C L, Dorland, W, Mikkelsen, D R, Rewoldt, G, Bonoli, P T, Ernst, D R, Rice, J E, and Wukitch, S J. Stability of Microturbulent Drift Modes during Internal Transport Barrier Formation in the Alcator C-Mod Radio Frequency Heated H-mode. United States: N. p., 2003. Web. doi:10.2172/820200.
Redi, M H, Fiore, C L, Dorland, W, Mikkelsen, D R, Rewoldt, G, Bonoli, P T, Ernst, D R, Rice, J E, & Wukitch, S J. Stability of Microturbulent Drift Modes during Internal Transport Barrier Formation in the Alcator C-Mod Radio Frequency Heated H-mode. United States. doi:10.2172/820200.
Redi, M H, Fiore, C L, Dorland, W, Mikkelsen, D R, Rewoldt, G, Bonoli, P T, Ernst, D R, Rice, J E, and Wukitch, S J. Thu . "Stability of Microturbulent Drift Modes during Internal Transport Barrier Formation in the Alcator C-Mod Radio Frequency Heated H-mode". United States. doi:10.2172/820200. https://www.osti.gov/servlets/purl/820200.
@article{osti_820200,
title = {Stability of Microturbulent Drift Modes during Internal Transport Barrier Formation in the Alcator C-Mod Radio Frequency Heated H-mode},
author = {Redi, M H and Fiore, C L and Dorland, W and Mikkelsen, D R and Rewoldt, G and Bonoli, P T and Ernst, D R and Rice, J E and Wukitch, S J},
abstractNote = {Recent H-mode experiments on Alcator C-Mod [I.H. Hutchinson, et al., Phys. Plasmas 1 (1994) 1511] which exhibit an internal transport barrier (ITB), have been examined with flux tube geometry gyrokinetic simulations, using the massively parallel code GS2 [M. Kotschenreuther, G. Rewoldt, and W.M. Tang, Comput. Phys. Commun. 88 (1995) 128]. The simulations support the picture of ion/electron temperature gradient (ITG/ETG) microturbulence driving high xi/ xe and that suppressed ITG causes reduced particle transport and improved ci on C-Mod. Nonlinear calculations for C-Mod confirm initial linear simulations, which predicted ITG stability in the barrier region just before ITB formation, without invoking E x B shear suppression of turbulence. Nonlinear fluxes are compared to experiment, which both show low heat transport in the ITB and higher transport within and outside of the barrier region.},
doi = {10.2172/820200},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2003},
month = {11}
}