Poloidal asymmetry and gradient drive in core electron density and temperature fluctuations on the Texas Experimental Tokamak-Upgrade

Journal Article · Wed May 01 00:00:00 EDT 1996 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.871998· OSTI ID:282905

Watts, C; Gandy, R F ^[1]; Cima, G; Bravenec, R V; Ross, D W; Wootton, A J ^[2]; Ouroua, A; Heard, J W; Crowley, T P; Schoch, P M ^[3]; Brower, D L; Jiang, Y ^[4]; Deng, B; Domier, C W; Luhmann, Jr, N C ^[5]

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1. Department of Physics, Auburn University, Auburn, Alabama 36849 (United States)
2. Fusion Research Center, University of Texas at Austin, Austin, Texas 78712 (United States)
3. Rensselaer Polytechnic Institute, Troy, New York 12180 (United States)
4. University of California at Los Angeles, Los Angeles, California 90024 (United States)
5. University of California at Davis, Davis, California 95616 (United States)

Electron temperature and density fluctuations are measured in the core of the Texas Experimental Tokamak-Upgrade (TEXT-U) [P. H. Edmonds, E. R. Solano, and A. J. Wootton, in {ital Proceedings} {ital of} {ital the} 15{ital th} {ital Symposium} {ital on} {ital Fusion} {ital Technology}, Utrecht (Elsevier Science, Amsterdam, 1989), Vol. 1, p. 342] plasma across the poloidal cross section. The high spatial resolution of the heavy-ion beam probe (HIBP) and correlation radiometry of electron cyclotron emission (CRECE) reveal that both the density and temperature fluctuations are strongly poloidally asymmetric. Temperature fluctuation measurements indicate a broadband drift wave feature localized near the plasma equatorial plane on both the high- and low-field sides, which is consistent with density fluctuation measurements by far infrared (FIR) scattering. In contrast, the HIBP observes this feature localized only to the low-field side. Excellent spatial resolution allows us to investigate whether changes in the gradient affect the fluctuation amplitudes. We find that indeed, the temperature fluctuations increase with the electron temperature gradient. Results also link density fluctuations to changes in the density gradient. {copyright} {ital 1996 American Institute of Physics.}

• DOE Contract Number: FG02-85ER53211; FG03-94ER54241; FG05-90ER54085
• OSTI ID: 282905
• Journal Information: Physics of Plasmas, Vol. 3, Issue 5; Other Information: PBD: May 1996
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION
TEXT DEVICES
FLUCTUATIONS
ELECTRON DENSITY
ELECTRON TEMPERATURE
TOKAMAK DEVICES
CHARGED-PARTICLE TRANSPORT
HEAT FLUX
PLASMA DIAGNOSTICS
ECR HEATING
TURBULENCE