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Shows edge-localized modes onset at low pressures in spherical tokamak, suggesting new insights for plasma stability.
Experiments at the spherical tokamak Globus-M2 exhibited the edge-localized modes (ELMs) onsets at the lowest observable pressures (P=1.2 kPa) in magnetic configuration with triangularity below 0.2. The observed ELMs have a high frequency around 2 kHz and corresponded to type-V. The low triangularity discharges are expected to demonstrate a low toroidal mode number (n=5) peeling–ballooning destabilization at experimentally observed pressure level according to three-field magnetohydrodynamic simulations.
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Солоха et al. (2025) studied this question.
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