Core temperature fluctuations and related heat transport in the Texas Experimental Tokamak-Upgrade

Journal Article · Wed Mar 01 04:00:00 EST 1995 · Physics of Plasmas; (United States)

DOI:https://doi.org/10.1063/1.871423· OSTI ID:6849845

Cima, G; Bravenec, R V; Wootton, A J ^[1]; Rempel, T D; Gandy, R F; Watts, C ^[2]; Kwon, M ^[3]

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1. Fusion Research Center, The University of Texas at Austin, Austin, Texas 78712 (United States)
2. Auburn University, Auburn, Alabama 36849 (United States)
3. Pohang Institute of Science and Technology, Pohang (Korea, Republic of)

The mechanism(s) responsible for anomalous heat transport in the tokamak plasma core has remained elusive to experimental verification. In this paper the hypothesis that high-frequency electrostatic turbulence can account for the measured electron heat transport in Ohmically heated tokamak discharges of the Texas Experimental Tokamak-Upgrade (TEXT-U) [[ital Proceedings] [ital of] [ital the] 15[ital th] [ital Symposium] [ital on] [ital Fusion] [ital Technology], Utrecht (Elsevier, Amsterdam, 1989), Vol. 1, p. 342] is tested. To accomplish this, core temperature fluctuations have been determined from the measured correlation between two electron cyclotron radiation signals detected by a multichannel high-frequency-resolution heterodyne radiometer. It is found that long wavelength modes (poloidal wave number [approx lt]1 cm[sup [minus]1]) are present, with an electron temperature fluctuation amplitude comparable to the density fluctuation amplitude. However, these modes cannot account for observed transport. An extrapolation of the observed turbulent temperature spectrum to the shorter wavelengths measured by far infrared scattering shows that shorter-wavelength electrostatic turbulence could still be responsible for transport.

• DOE Contract Number: FG05-88ER53267
• OSTI ID: 6849845
• Journal Information: Physics of Plasmas; (United States), Journal Name: Physics of Plasmas; (United States) Vol. 2:3; ISSN PHPAEN; ISSN 1070-664X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700340* -- Plasma Waves
Oscillations
& Instabilities-- (1992-)
CHEMICAL ANALYSIS
CLOSED PLASMA DEVICES
ELECTROMAGNETIC RADIATION
ELECTRON TEMPERATURE
ENERGY TRANSFER
FAR INFRARED RADIATION
FLUCTUATIONS
HEAT TRANSFER
INFRARED RADIATION
QUANTITATIVE CHEMICAL ANALYSIS
RADIATIONS
RADIOMETRIC ANALYSIS
TEMPERATURE MEASUREMENT
THERMONUCLEAR DEVICES
TOKAMAK DEVICES
TURBULENCE
VARIATIONS