Adiabatic electron thermal pressure fluctuations in tokamak plasmas

Electron thermal pressure fluctuations measured in the edge plasma of the Texas Experimental Tokamak Upgrade are a fundamental component of plasma turbulence on both sides of the velocity shear layer. The ratio of specific heats, estimated from fluctuations in electron temperature and electron numbe...

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Bibliographic Details
Published in:Physical review letters 2001-08, Vol.87 (8), p.085003-085003, Article 085003
Main Authors: Meier, M A, Bengtson, R D, Hallock, G A, Wootton, A J
Format: Article
Language:English
Subjects:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ELECTRODES
ELECTRON TEMPERATURE
ELECTRONS
FLUCTUATIONS
LANGMUIR PROBE
PLASMA
SHEAR
SPATIAL RESOLUTION
SPECIFIC HEAT
TEXT DEVICES
THERMODYNAMIC PROPERTIES
TURBULENCE
VELOCITY
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Summary:Electron thermal pressure fluctuations measured in the edge plasma of the Texas Experimental Tokamak Upgrade are a fundamental component of plasma turbulence on both sides of the velocity shear layer. The ratio of specific heats, estimated from fluctuations in electron temperature and electron number density measured simultaneously at the same electrode, indicates that observed fluctuations are adiabatic. The observations are made by means of a novel Langmuir probe technique, the time domain triple-probe method, which concurrently measures multiple plasma properties at each of two electrodes with the temporal and the spatial resolution required to estimate thermodynamic properties in a turbulent plasma.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.87.085003