In:
Plasma Physics Reports, Pleiades Publishing Ltd, Vol. 49, No. 4 ( 2023-04), p. 419-427
Abstract:
Among the peripheral instabilities observed at the Globus-M2 tokamak, two types of edge localized modes (ELMs) are brought into focus: ELMs synchronized and desynchronized with the sawtooth oscillations. The desynchronized ELMs appear in regimes that are characterized by high values of pressure in the pedestal, p ped ≥ 3 kPa, and they are observed in discharges with the toroidal magnetic field B T 〉 0.6 T and plasma current I P 〉 0.3 MA. The desynchronized ELMs belong to the type-III/V with the dominating effect of the peeling mode. The synchronized ELMs were observed in a wider range of discharge parameters, including at B T 〈 0.6 T and I P 〈 0.3 MA. Calculations of the stability of the peeling-ballooning (PB) mode showed that at pedestal width ψ norm = 0.09 and p ped 〉 3.5 kPa, destabilization of PB modes is possible without additional influence. Experimental data shows that the microtearing mode plays a dominant role in the pedestal. The microtearing mode does not allow the pedestal at Globus-M2 tokamak to reach the state of the unstable kinetic ballooning mode (KBM), which explains the low predictive power of the EPED model at this tokamak.
Type of Medium:
Online Resource
ISSN:
1063-780X
,
1562-6938
DOI:
10.1134/S1063780X23600184
Language:
English
Publisher:
Pleiades Publishing Ltd
Publication Date:
2023
detail.hit.zdb_id:
2004929-8
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