A comparison of Langmuir probe techniques for measuring temperature fluctuations

Two techniques are applied and the results compared in the edge plasma of TEXT‐U to estimate temperature fluctuations. The first technique fits the measured current fluctuations from a double probe as a function of probe bias with several fitting functions to provide density, and temperature fluctua...

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Bibliographic Details
Published in:Review of Scientific Instruments 1992-10, Vol.63 (10), p.4611-4613
Main Authors: Lin, H., Li, G. X., Bengtson, Roger D., Ritz, Ch. P., Tsui, H. Y. W.
Format: Article
Language:English
Subjects:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700350 - Plasma Production, Heating, Current Drive, & Interactions- (1992-)
CLOSED PLASMA DEVICES
COMPARATIVE EVALUATIONS
ELECTRIC POTENTIAL
ELECTRIC PROBES
ELECTRONS
ELEMENTARY PARTICLES
EVALUATION
Exact sciences and technology
FERMIONS
FLUCTUATIONS
Instruments & Instrumentation
LANGMUIR PROBE
LEPTONS
Physical Sciences
Physics
Physics of gases, plasmas and electric discharges
Physics of plasmas and electric discharges
Physics, Applied
Plasma diagnostic techniques and instrumentation
PLASMA DIAGNOSTICS
PLASMA POTENTIAL
PROBES
RUNAWAY ELECTRONS
Science & Technology
Technology
TEMPERATURE MEASUREMENT
TEXT DEVICES
THERMONUCLEAR DEVICES
TOKAMAK DEVICES
VARIATIONS
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Summary:Two techniques are applied and the results compared in the edge plasma of TEXT‐U to estimate temperature fluctuations. The first technique fits the measured current fluctuations from a double probe as a function of probe bias with several fitting functions to provide density, and temperature fluctuations but with no spectral information. The second method uses a triple‐probe technique to measure density, temperature, and floating potential as a function of time. The two techniques are in agreement to within estimated error limits and find T̃/T≊0.4–0.5 ñ/n both in the scrape‐off layer and in the main body of the plasma.
ISSN:0034-6748
1089-7623
DOI:10.1063/1.1143684