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Extension of the flux fit method for estimating power deposition profiles

Author
Abstract

The flux fit method is used to self-consistently estimate the power deposition profile and heat transport profiles from temperature measurements originating from perturbative experiments with a modulated source. This Letter improves on this method by addressing the limitations and assumptions. The most crucial improvement is the additional freedom in the source deposition profile. Allowing for a variable central deposition location and height and including a skewness parameter produces deposition profiles more consistent with the measurement data, but still wider than equilibrium ray tracing in two different DIII-D discharges. Moreover, we show that the quality of the estimated deposition profile is key to the accuracy of diffusivity and convectivity estimates, but inversely, the estimated transport parameters hardly affect the quality of the power deposition estimate. Using this method, we show that the power deposition profile estimate is broadened with respect to ray-tracing by about 1.7–1.8 times in two DIII-D discharges.

Year of Publication
2022
Journal
Physics of Plasmas
Volume
29
Issue
1
Number of Pages
010703
DOI
10.1063/5.0069869
PId
110e49e68616cd1e85c47ae2584f5c9b
Alternate Journal
Phys. Plasmas
Label
OA
Attachment
Journal Article
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