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The influence of rotation on the betaN threshold for the 2/1 neoclassical tearing mode in DIII-D
Utilizing a capability to vary neutral beam torque injection in the DIII-D [J. L. Luxon, Nucl. Fusion 42, 614 (2002)] tokamak, m/n=2/1 neoclassical tearing mode onset thresholds are found to fall by a...
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Lower hybrid current drive experiments on Alcator C-Mod: Comparison with theory and simulation
Lower hybrid (LH) current drive experiments have been carried out on the Alcator C-Mod tokamak [I. H. Hutchinson et al., Phys. Plasmas 1, 1511 (1994)] using a radio-frequency system at 4.6  ...

Measurements of core electron temperature and density fluctuations in DIII-D and comparison to nonlinear gyrokinetic simulations

Phys. Plasmas 15, 056116 (2008); doi:10.1063/1.2895408

Published 22 April 2008

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A. E. White,1 L. Schmitz,1 G. R. McKee,2 C. Holland,3 W. A. Peebles,1 T. A. Carter,1 M. W. Shafer,2 M. E. Austin,4 K. H. Burrell,5 J. Candy,5 J. C. DeBoo,5 E. J. Doyle,1 M. A. Makowski,6 R. Prater,5 T. L. Rhodes,1 G. M. Staebler,5 G. R. Tynan,3 R. E. Waltz,5 and G. Wang1
1University of California-Los Angeles, Los Angeles, California 90095, USA
2University of Wisconsin-Madison, Madison, Wisconsin 53706, USA
3University of California-San Diego, La Jolla, California 92093, USA
4University of Texas, Austin, Texas 78712, USA
5General Atomics, P.O. Box 85608, San Diego, California 92186, USA
6Lawrence Livermore National Laboratory, Livermore, California 94551, USA
For the first time, profiles (0.3<rho<0.9) of electron temperature and density fluctuations in a tokamak have been measured simultaneously and the results compared to nonlinear gyrokinetic simulations. Electron temperature and density fluctuations measured in neutral beam-heated, sawtooth-free low confinement mode (L-mode) plasmas in DIII-D [J. L. Luxon, Nucl. Fusion 42, 614 (2002)] are found to be similar in frequency and normalized amplitude, with amplitude increasing with radius. The measured radial profile of two fluctuation fields allows for a new and rigorous comparison with gyrokinetic results. Nonlinear gyrokinetic flux-tube simulations predict that electron temperature and density fluctuations have similar normalized amplitudes in L-mode. At rho=0.5, simulation results match experimental heat diffusivities and density fluctuation amplitude, but overestimate electron temperature fluctuation amplitude and particle diffusivity. In contrast, simulations at rho=0.75 do not match either the experimentally derived transport properties or the measured fluctuation levels. ©2008 American Institute of Physics
History: Received 16 November 2007; accepted 1 January 2008; published 22 April 2008
Permalink: http://link.aip.org/link/?PHPAEN/15/056116/1
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