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On the edge turbulence effects on the density profile reconstruction using O-mode reflectometers

Abstract : The effect of turbulence in the position measurements of the DEMO Plasma position reflectometer is evaluated at the high field side equatorial plane location using REFMULF, a 2D finite-difference time-domain full-wave code for reflectometry simulations. Different levels of turbulence (1-10%) of a Kolmogorov-like k-spectrum are analysed statistically with random generated density fluctuations. The study shows that for turbulence amplitudes in the range 1-7% most of the measurements are not affected significantly and the reflectometer can provide the position measurements within the DEMO requirements. For higher levels of turbulence, the mean error becomes negative and its absolute value and the standard deviation increases for values in the order of 0.5 cm. One of the reasons for this behavior is the deviation of the effective cutoff position. In these cases, part of the measurements are out of the requirements, and a study must be done to understand if the reconstruction of the separatrix stills possible for the order of error of the failed measurements (1-2 cm). Other possibility is to apply a correction based on the mean position value as function of the turbulence amplitude to the position measurements. This could be applied dynamically during the plasma pulse.
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https://hal.univ-lorraine.fr/hal-03251829
Contributor : Stéphane Heuraux <>
Submitted on : Monday, June 7, 2021 - 12:44:57 PM
Last modification on : Wednesday, June 9, 2021 - 3:30:34 AM

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E. Ricardo, F. da Silva, Stéphane Heuraux, A. Silva. On the edge turbulence effects on the density profile reconstruction using O-mode reflectometers. Fusion Engineering and Design, Elsevier, 2021, ⟨10.1016/j.fusengdes.2021.112652⟩. ⟨hal-03251829⟩

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