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Conference Papers Year : 2023

A fully synthetic type-I ELM cycle diagnostic using conventional O-mode reflectometry

Abstract

Significant advances in modeling and simulations for microwave reflectometry have been conducted in recent years. An example is the integration of improved numerical descriptions of magneto-hydrodynamics (MHD) instabilities, obtained from MHD codes, together with 2D full-wave codes to implement synthetic reflectometry diagnostics in realistic conditions. In particular, the nonlinear MHD code JOREK has been used previously together with the 2D fullwave code REFMUL, to assess the response of conventional O-mode reflectometry along a Type-I edge localized mode (ELM) crash. In this work, a similar framework and synthetic diagnostic setup are considered but with an extended MHD simulation where a Type-I ELM cycle comprised of several ELM crashes is studied. This includes the selfconsistent MHD evolution along inter-ELM periods, which was absent in the previous study. The reflectometer response at the mid-plane of the low magnetic field side is used to provide information about the behavior of density fluctuations along the full ELM cycle. The inter-ELM periods display density fluctuations in agreement with the ELM triggering mechanisms manifesting as reflectometry signatures which are identified with ELM precursors. The precursor signatures are observed a few milliseconds before a transition from linear to non-linear reflectometry regimes occurs, associated with the explosive onset of the ELM.
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Avant la publication
Monday, August 19, 2024
Embargoed file
Monday, August 19, 2024
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Dates and versions

hal-04190620 , version 1 (29-08-2023)

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Cite

J. Vicente, A. Cathey, F. Da Silva, Stéphane Heuraux, M. Hoelzl, et al.. A fully synthetic type-I ELM cycle diagnostic using conventional O-mode reflectometry. 24TH TOPICAL CONFERENCE ON RADIO-FREQUENCY POWER IN PLASMAS, Sep 2023, Annapolis USA, United States. pp.110005, ⟨10.1063/5.0162612⟩. ⟨hal-04190620⟩
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