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Author Brookman, M. W. ♦ Austin, M. E. ♦ Petty, C. C.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS ♦ CALCULATION METHODS ♦ COMPARATIVE EVALUATIONS ♦ DENSITY ♦ DEPOSITION ♦ DOUBLET-3 DEVICE ♦ ECR CURRENT DRIVE ♦ ECR HEATING ♦ ELECTRONS ♦ FLUCTUATIONS ♦ FORECASTING ♦ FOURIER HEAT EQUATION ♦ HARMONICS ♦ ITER TOKAMAK ♦ MAGNETIC SURFACES ♦ PLASMA ♦ RADIOMETERS ♦ TCV TOKAMAK ♦ TRANSPORT THEORY
Abstract Theoretical work, computation, and results from TCV [J. Decker “Effect of density fluctuations on ECCD in ITER and TCV,” EPJ Web of Conf. 32, 01016 (2012)] suggest that density fluctuations in the edge region of a tokamak plasma can cause broadening of the ECH deposition profile. In this paper, a GUI tool is presented which is used for analysis of ECH deposition as a first step towards looking for this broadening, which could explain effects seen in previous DIII-D ECH transport studies [K.W. Gentle “Electron energy transport inferences from modulated electron cyclotron heating in DIII-D,” Phys. Plasmas 13, 012311 (2006)]. By applying an FFT to the T{sub e} measurements from the University of Texas’s 40-channel ECE Radiometer, and using a simplified thermal transport equation, the flux surface extent of ECH deposition is determined. The Fourier method analysis is compared with a Break-In-Slope (BIS) analysis and predictions from the ray-tracing code TORAY. Examination of multiple Fourier harmonics and BIS fitting methods allow an estimation of modulated transport coefficients and thereby the true ECH deposition profile. Correlations between edge fluctuations and ECH deposition in legacy data are also explored as a step towards establishing a link between fluctuations and deposition broadening in DIII-D.
ISSN 0094243X
Educational Use Research
Learning Resource Type Article
Publisher Date 2015-12-10
Publisher Place United States
Volume Number 1689
Issue Number 1


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