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

Abstract

H-mode experiments on Alcator C-Mod [I.H. Hutchinson, et al., Phys. Plasma 1 (1994) 1511] which exhibit an internal transport barrier (ITB), have been examined with gyrokinetic simulations, near the ITB onset time. Linear simulations support the picture of ion and electron temperature gradient (ITG, ETG) microturbulence driving high {chi}{sub i} and {chi}{sub e}, respectively, and that stable ITG correlates with reduced particle transport and improved ion thermal confinement on C-Mod. In the barrier region ITG is weakly unstable, with a critical temperature gradient higher than expected from standard models. Nonlinear calculations and the role of E x B shear suppression of turbulence outside the plasma core are discussed in light of recent profile measurements for the toroidal velocity. The gyrokinetic model benchmarks successfully against experiment in the plasma core.

Authors:
; ; ; ; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Sponsoring Org.:
USDOE Office of Science (SC) (US)
OSTI Identifier:
834538
Report Number(s):
pppl-4000
TRN: US0407232
DOE Contract Number:  
AC02-76CH03073
Resource Type:
Technical Report
Resource Relation:
Other Information: PBD: 1 Sep 2004
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; BENCHMARKS; CONFINEMENT; CRITICAL TEMPERATURE; ELECTRON TEMPERATURE; PLASMA; SHEAR; STABILITY; STANDARD MODEL; TRANSPORT; TURBULENCE; VELOCITY; COMPUTATIONAL PHYSICS; TOKAMAKS; TRANSPORT THEORY

Citation Formats

Redi, M H, Dorland, W, Fiore, C L, Bonoli, P T, Greenwald, M J, Rice, J E, Baumgaertel, J A, Hahm, T S, Hammett, G W, Hill, K, McCune, D C, Mikkelsen, D R, and Rewoldt, G. Microturbulent Drift Mode Stability before Internal Transport Barrier Formation in the Alcator C-Mod Radio Frequency Heated H-mode. United States: N. p., 2004. Web. doi:10.2172/834538.
Redi, M H, Dorland, W, Fiore, C L, Bonoli, P T, Greenwald, M J, Rice, J E, Baumgaertel, J A, Hahm, T S, Hammett, G W, Hill, K, McCune, D C, Mikkelsen, D R, & Rewoldt, G. Microturbulent Drift Mode Stability before Internal Transport Barrier Formation in the Alcator C-Mod Radio Frequency Heated H-mode. United States. https://doi.org/10.2172/834538
Redi, M H, Dorland, W, Fiore, C L, Bonoli, P T, Greenwald, M J, Rice, J E, Baumgaertel, J A, Hahm, T S, Hammett, G W, Hill, K, McCune, D C, Mikkelsen, D R, and Rewoldt, G. 2004. "Microturbulent Drift Mode Stability before Internal Transport Barrier Formation in the Alcator C-Mod Radio Frequency Heated H-mode". United States. https://doi.org/10.2172/834538. https://www.osti.gov/servlets/purl/834538.
@article{osti_834538,
title = {Microturbulent Drift Mode Stability before Internal Transport Barrier Formation in the Alcator C-Mod Radio Frequency Heated H-mode},
author = {Redi, M H and Dorland, W and Fiore, C L and Bonoli, P T and Greenwald, M J and Rice, J E and Baumgaertel, J A and Hahm, T S and Hammett, G W and Hill, K and McCune, D C and Mikkelsen, D R and Rewoldt, G},
abstractNote = {H-mode experiments on Alcator C-Mod [I.H. Hutchinson, et al., Phys. Plasma 1 (1994) 1511] which exhibit an internal transport barrier (ITB), have been examined with gyrokinetic simulations, near the ITB onset time. Linear simulations support the picture of ion and electron temperature gradient (ITG, ETG) microturbulence driving high {chi}{sub i} and {chi}{sub e}, respectively, and that stable ITG correlates with reduced particle transport and improved ion thermal confinement on C-Mod. In the barrier region ITG is weakly unstable, with a critical temperature gradient higher than expected from standard models. Nonlinear calculations and the role of E x B shear suppression of turbulence outside the plasma core are discussed in light of recent profile measurements for the toroidal velocity. The gyrokinetic model benchmarks successfully against experiment in the plasma core.},
doi = {10.2172/834538},
url = {https://www.osti.gov/biblio/834538}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Wed Sep 01 00:00:00 EDT 2004},
month = {Wed Sep 01 00:00:00 EDT 2004}
}