Simultaneous measurement of core electron temperature and density fluctuations during electron cyclotron heating on DIII-D

Journal Article · Mon Feb 15 00:00:00 EST 2010 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.3318469· OSTI ID:21347103

White, A E; Schmitz, L; Peebles, W A; Rhodes, T L; Carter, T A ^[1]; McKee, G R; Shafer, M W ^[2]; Staebler, G M; Burrell, K H; DeBoo, J C; Prater, R ^[3]

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1. Department of Physics and Astronomy, University of California-Los Angeles, Los Angeles, California 90095 (United States)
2. Department of Engineering, University of Wisconsin, Madison, Wisconsin 53706 (United States)
3. General Atomics, San Diego, California 92186 (United States)

New measurements show that long-wavelength (k{sub t}hetarho{sub s}<0.5) electron temperature fluctuations can play an important role in determining electron thermal transport in low-confinement mode (L-mode) tokamak plasmas. In neutral beam-heated L-mode tokamak plasmas, electron thermal transport and the amplitude of long-wavelength electron temperature fluctuations both increase in cases where local electron cyclotron heating (ECH) is used to modify the plasma profiles. In contrast, the amplitude of simultaneously measured long-wavelength density fluctuations does not significantly increase. Linear stability analysis indicates that the ratio of the trapped electron mode (TEM) to ion temperature gradient (ITG) mode growth rates increases in the cases with ECH. The increased importance of the TEM drive relative to the ITG mode drive in the cases with ECH may be associated with the increases in electron thermal transport and electron temperature fluctuations.

• OSTI ID: 21347103
• Journal Information: Physics of Plasmas, Vol. 17, Issue 2; Other Information: DOI: 10.1063/1.3318469; (c) 2010 American Institute of Physics; ISSN 1070-664X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
DOUBLET-3 DEVICE
ECR HEATING
ELECTRON TEMPERATURE
FLUCTUATIONS
ION TEMPERATURE
L-MODE PLASMA CONFINEMENT
NEUTRAL ATOM BEAM INJECTION
PLASMA BEAM INJECTION
PLASMA DENSITY
PLASMA DIAGNOSTICS
TEMPERATURE GRADIENTS
TRAPPED ELECTRONS
BEAM INJECTION
CLOSED PLASMA DEVICES
CONFINEMENT
ELECTRONS
ELEMENTARY PARTICLES
FERMIONS
HEATING
HIGH-FREQUENCY HEATING
LEPTONS
MAGNETIC CONFINEMENT
PLASMA CONFINEMENT
PLASMA HEATING
THERMONUCLEAR DEVICES
TOKAMAK DEVICES
VARIATIONS