Measurement of turbulent electron temperature fluctuations on the ASDEX Upgrade tokamak using correlated electron cyclotron emission

S.J. Freethy, G.D. Conway, I.G.J. Classen, A.J. Creely, T. Happel, A. Köhn, B. Vanovac, A.E. White

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Abstract

Turbulent temperature fluctuations are measured on the ASDEX Upgrade tokamak using pairs of closely spaced, narrow-band heterodyne radiometer channels and a standard correlation technique. The pre-detection spacing and bandwidth of the radiometer channel pairs is chosen such that they are physically separated less than a turbulent correlation length, but do not overlap. The radiometer has 4 fixed filter frequency channels and two tunable filter channels for added flexibility in the measurement position. Relative temperature fluctuation amplitudes are observed in a helium plasma to be δT/T = (0.76 ± 0.02)%, (0.67 ± 0.02)%, and (0.59 ± 0.03)% at normalised toroidal flux radius of ρtor = 0.82, 0.75, and 0.68, respectively.

Original languageEnglish
Article number11E102
Pages (from-to)1-3
JournalReview of Scientific Instruments
Volume87
Issue number11
DOIs
Publication statusPublished - 1 Nov 2016
Event43rd European Physical Society Conference on Plasma Physics, EPS 2016 - Leuven, Belgium
Duration: 4 Jul 20168 Jul 2016
Conference number: 43
https://kuleuvencongres.be/eps2016

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