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Sensitivity of Microwave Interferometer in the Limiter Shadow to filaments in ASDEX upgrade

Abstract : Microwave Interferometer in the Limiter Shadow (MILS) is a new diagnostic , installed on ASDEX Upgrade for electron density measurements in the far Scrape-Off Layer (SOL). At the chosen frequency of 47 GHz, the region of measurements varies within several centimetres before and after the limiter, depending on the density. 200 kHz bandwidth allows resolving transient events such as edge localized modes filaments and turbulence filaments. The measured quantities, phase shift, and power decay of the microwave beam, which crosses the plasma, are directly connected to the density and do not depend on any other plasma quantity. In this work, we analyse the influence of a filamentary perturbation on MILS signals. Simple representation of a filament is adopted, with parameters relevant to experimental filament properties, reported for ASDEX Upgrade. Forward modelling is done in COMSOL software by using RAPLICA-SOL, to study the response of the MILS synthetic diagnostic to the presence of a filament. Qualitative and quantitative dependencies are obtained and the boundaries of MILS sensitivity to filaments, or to the density perturbation in far SOL in general, are outlined.
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https://hal.univ-lorraine.fr/hal-03587168
Contributor : Stéphane Heuraux Connect in order to contact the contributor
Submitted on : Thursday, February 24, 2022 - 12:54:28 PM
Last modification on : Friday, February 25, 2022 - 3:34:28 AM

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Mariia Usoltceva, Stéphane Heuraux, Ildar Khabibullin, Helmut Faugel, Helmut Fünfgelder, et al.. Sensitivity of Microwave Interferometer in the Limiter Shadow to filaments in ASDEX upgrade. Contributions to Plasma Physics, Wiley-VCH Verlag, 2022, ⟨10.1002/ctpp.202100194⟩. ⟨hal-03587168⟩

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