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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

M.H. Redi, C.L. Fiore, W. Dorland, D.R. Mikkelsen, G. Rewoldt, P.T. Bonoli, D.R. Ernst, J.E. Rice, and S.J. Wukitch. 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.
M.H. Redi, C.L. Fiore, W. Dorland, D.R. Mikkelsen, G. Rewoldt, P.T. Bonoli, D.R. Ernst, J.E. Rice, & S.J. Wukitch. 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.
M.H. Redi, C.L. Fiore, W. Dorland, D.R. Mikkelsen, G. Rewoldt, P.T. Bonoli, D.R. Ernst, J.E. Rice, and S.J. Wukitch. 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 = {M.H. Redi and C.L. Fiore and W. Dorland and D.R. Mikkelsen and G. Rewoldt and P.T. Bonoli and D.R. Ernst and J.E. Rice and S.J. Wukitch},
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 = {Thu Nov 20 00:00:00 EST 2003},
month = {Thu Nov 20 00:00:00 EST 2003}
}

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