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Conference papers

IST CONTRIBUTIONS TO THE ASDEX UPGRADE EDGE AND DIVERTOR PHYSICS USING MICROWAVE REFLECTOMETRY

Abstract : Information of the plasma density such as provided by reflectometry is essential for the study and operation of magnetically confined fusion devices. The microwave reflectometry systems developed by IST for ASDEX Upgrade consist of: (i) a multi-band frequency modulated continuous wave O-mode reflectometer with the unique capability of providing profile and fluctuations measurements on the high-field side and low-field side (LFS) simultaneously, making it a relevant diagnostic for poloidal asymmetry studies; (ii) a fast frequency hopping O-mode reflectometer used to obtain more detailed information on density fluctuations at the LFS; and (iii) a multichannel X-mode reflectometry diagnostic recently installed to measure the edge density profile in front of the ICRF antenna. This contribution presents an overview of the scientific results obtained with the different reflectometry systems used in a complementary way in order to address some of the key issues under investigation at ASDEX Upgrade. The experimental results obtained demonstrate that the IST reflectometry systems provide a valuable contribution to a better understanding of important physics topics such as connection between midplane and divertor conditions, dynamics of the density profiles, SOL turbulence, pedestal instabilities, RF sheath effects and real-time control.
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Submitted on : Sunday, October 18, 2020 - 8:25:05 AM
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C Silva, D Aguiam, M Bernert, G Conway, L Gil, et al.. IST CONTRIBUTIONS TO THE ASDEX UPGRADE EDGE AND DIVERTOR PHYSICS USING MICROWAVE REFLECTOMETRY. 27th IAEA Fusion Energy Conference - IAEA Gandhinagar India (22-27 October 2018), Oct 2018, Gandhinagar, India. ⟨hal-02970367⟩

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