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Title: Multi-field/multi-scale turbulence response to electron cyclotron heating of DIII-D ohmic plasmas

Abstract

The multi-field/multi-scale core ({rho}{approx} 0.5-0.8) turbulence response to electron cyclotron heating (ECH) of DIII-D Ohmic plasmas is reported for the first time. Long wavelength (low-k) electron temperature (T-tilde{sub e}/T{sub e}) and high-k density turbulence levels (n-tilde{sub e}/n{sub e}) are observed to strongly increase during ECH. In contrast, low-k and intermediate-k n-tilde{sub e}/n{sub e} showed little change, whereas the cross-phase between local low-k electron temperature and density fluctuations ({alpha}{sub n{sub eT{sub e}}}) was significantly modified. The increase in the electron thermal diffusivity determined from power balance is consistent with the increased turbulent transport correlated with the measured increases in low-k T-tilde{sub e}/T{sub e} and high-k n-tilde{sub e}/n{sub e}. Linear stability analysis using the trapped gyro-Landau fluid (TGLF) model indicates an enhanced growth rate for electron modes [e.g., trapped electron mode (TEM)] at low-k consistent with the observed modifications in T-tilde{sub e}/T{sub e} and {alpha}{sub n{sub eT{sub e}}}. TGLF also predicts an increase in high-k electron mode growth rates for normalized wavenumbers k{sub {theta}}{rho}{sub s} > 7, where electron temperature gradient (ETG) modes exist, which is consistent with the observed increase in high-kn-tilde{sub e}/n{sub e} turbulence.

Authors:
; ; ; ; ; ;  [1]; ; ; ; ; ;  [2]; ;  [3];  [4];  [5]
  1. Physics and Astronomy Department and PSTI, University of California, Los Angeles, California 90095 (United States)
  2. General Atomics, P.O. Box 85608, San Diego, California 92186 (United States)
  3. University of Wisconsin-Madison, Madison, Wisconsin 53706 (United States)
  4. Princeton Plasma Physics Lab, Princeton, New Jersey 08543 (United States)
  5. Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 (United States)
Publication Date:
OSTI Identifier:
22043398
Resource Type:
Journal Article
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 18; Journal Issue: 8; Other Information: (c) 2011 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1070-664X
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; CONFINEMENT; DENSITY; DOUBLET-3 DEVICE; ECR HEATING; ELECTRON TEMPERATURE; ION TEMPERATURE; PLASMA; PLASMA DENSITY; PLASMA INSTABILITY; PLASMA SIMULATION; RF SYSTEMS; STABILITY; TEMPERATURE GRADIENTS; THERMAL DIFFUSIVITY; TRANSMISSION ELECTRON MICROSCOPY; TRAPPED ELECTRONS; TRAPPING; TURBULENCE; WAVELENGTHS

Citation Formats

Wang, G, Peebles, W A, Rhodes, T L, Hillesheim, J C, Doyle, E J, Schmitz, L, Zeng, L, DeBoo, J C, Staebler, G M, Petty, C C, Burrell, K H, Leonard, A W, VanZeeland, M A, Yan, Z, McKee, G R, Solomon, W M, and White, A E. Multi-field/multi-scale turbulence response to electron cyclotron heating of DIII-D ohmic plasmas. United States: N. p., 2011. Web. doi:10.1063/1.3610552.
Wang, G, Peebles, W A, Rhodes, T L, Hillesheim, J C, Doyle, E J, Schmitz, L, Zeng, L, DeBoo, J C, Staebler, G M, Petty, C C, Burrell, K H, Leonard, A W, VanZeeland, M A, Yan, Z, McKee, G R, Solomon, W M, & White, A E. Multi-field/multi-scale turbulence response to electron cyclotron heating of DIII-D ohmic plasmas. United States. doi:10.1063/1.3610552.
Wang, G, Peebles, W A, Rhodes, T L, Hillesheim, J C, Doyle, E J, Schmitz, L, Zeng, L, DeBoo, J C, Staebler, G M, Petty, C C, Burrell, K H, Leonard, A W, VanZeeland, M A, Yan, Z, McKee, G R, Solomon, W M, and White, A E. Mon . "Multi-field/multi-scale turbulence response to electron cyclotron heating of DIII-D ohmic plasmas". United States. doi:10.1063/1.3610552.
@article{osti_22043398,
title = {Multi-field/multi-scale turbulence response to electron cyclotron heating of DIII-D ohmic plasmas},
author = {Wang, G and Peebles, W A and Rhodes, T L and Hillesheim, J C and Doyle, E J and Schmitz, L and Zeng, L and DeBoo, J C and Staebler, G M and Petty, C C and Burrell, K H and Leonard, A W and VanZeeland, M A and Yan, Z and McKee, G R and Solomon, W M and White, A E},
abstractNote = {The multi-field/multi-scale core ({rho}{approx} 0.5-0.8) turbulence response to electron cyclotron heating (ECH) of DIII-D Ohmic plasmas is reported for the first time. Long wavelength (low-k) electron temperature (T-tilde{sub e}/T{sub e}) and high-k density turbulence levels (n-tilde{sub e}/n{sub e}) are observed to strongly increase during ECH. In contrast, low-k and intermediate-k n-tilde{sub e}/n{sub e} showed little change, whereas the cross-phase between local low-k electron temperature and density fluctuations ({alpha}{sub n{sub eT{sub e}}}) was significantly modified. The increase in the electron thermal diffusivity determined from power balance is consistent with the increased turbulent transport correlated with the measured increases in low-k T-tilde{sub e}/T{sub e} and high-k n-tilde{sub e}/n{sub e}. Linear stability analysis using the trapped gyro-Landau fluid (TGLF) model indicates an enhanced growth rate for electron modes [e.g., trapped electron mode (TEM)] at low-k consistent with the observed modifications in T-tilde{sub e}/T{sub e} and {alpha}{sub n{sub eT{sub e}}}. TGLF also predicts an increase in high-k electron mode growth rates for normalized wavenumbers k{sub {theta}}{rho}{sub s} > 7, where electron temperature gradient (ETG) modes exist, which is consistent with the observed increase in high-kn-tilde{sub e}/n{sub e} turbulence.},
doi = {10.1063/1.3610552},
journal = {Physics of Plasmas},
issn = {1070-664X},
number = 8,
volume = 18,
place = {United States},
year = {2011},
month = {8}
}