Classification of Edge Instabilities at Globus-M2 Tokamak

Autor: V. V. Solokha, G. S. Kurskiev, A. Yu. Yashin, I. M. Balachenkov, V. I. Varfolomeev, A. V. Voronin, V. K. Gusev, V. Yu. Goryainov, V. V. Dyachenko, N. S. Zhiltsov, E. O. Kiselev, V. B. Minaev, A. N. Novokhatsky, Yu. V. Petrov, A. M. Ponomarenko, N. V. Sakharov, A. Yu. Telnova, E. E. Tkachenko, V. A. Tokarev, S. Yu. Tolstyakov, E. A. Tukhmeneva, N. A. Khromov, P. B. Shchegolev
Rok vydání: 2023
Předmět:
Zdroj: Plasma Physics Reports. 49:419-427
ISSN: 1562-6938
1063-780X
DOI: 10.1134/s1063780x23600184
Popis: 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, pped ≥ 3 kPa, and they are observed in discharges with the toroidal magnetic field BT > 0.6 T and plasma current IP > 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 BT < 0.6 T and IP < 0.3 MA. Calculations of the stability of the peeling-ballooning (PB) mode showed that at pedestal width ψnorm = 0.09 and pped > 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.
Databáze: OpenAIRE
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