Classification of Edge Instabilities at Globus-M2 Tokamak

V. V. Solokha; Солоха В. В.; Yu. V. Petrov; Петров Ю. В.; A. M. Ponomarenko; Пономаренко А. М.; N. V. Sakharov; Сахаров Н. В.; A. Yu. Telnova; Тельнова А. Ю.; E. E. Tkachenko; Ткаченко Е. Е.; V. A. Tokarev; Токарев В. А.; S. Yu. Tolstyakov; Толстяков С. Ю.; E. A. Tyukhmeneva; Тюхменева Е. А.; N. A. Khromov; Хромов Н. А.; A. N. Novokhatskii; Новохацкий А. Н.; V. B. Minaev; Минаев В. Б.; E. O. Kiselev; Киселев Е. О.; G. S. Kurskiev; Курскиев Г. С.; A. Yu. Yashin; Яшин А. Ю.; I. M. Balachenkov; Балаченков И. М.; V. I. Varfolomeev; Варфоломеев В. И.; A. V. Voronin; Воронин А. В.; V. K. Gusev; Гусев В. К.; V. Yu. Goryainov; Горяинов В. Ю.; V. V. Dyachenko; Дьяченко В. В.; N. S. Zhiltsov; Жильцов Н. С.; P. B. Shchegolev; Щеголев П. Б.

doi:10.31857/S0367292122601540

Classification of Edge Instabilities at Globus-M2 Tokamak

Autores: Solokha V.¹, Petrov Y.¹, Ponomarenko A.², Sakharov N.¹, Telnova A.¹, Tkachenko E.¹, Tokarev V.¹, Tolstyakov S.¹, Tyukhmeneva E.¹, Khromov N.¹, Novokhatskii A.¹, Minaev V.¹, Kiselev E.¹, Kurskiev G.¹, Yashin A.¹^,2, Balachenkov I.¹, Varfolomeev V.¹, Voronin A.¹, Gusev V.¹, Goryainov V.¹, Dyachenko V.¹, Zhiltsov N.¹, Shchegolev P.¹
Afiliações:
1. Ioffe Institute, Russian Academy of Sciences
2. Peter the Great St. Petersburg Polytechnic University
Edição: Volume 49, Nº 4 (2023)
Páginas: 322-331
Seção: ТОКАМАКИ
URL: https://journals.rcsi.science/0367-2921/article/view/139563
DOI: https://doi.org/10.31857/S0367292122601540
EDN: https://elibrary.ru/FKNQKA
ID: 139563

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Resumo

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.

Palavras-chave

high-temperature plasma, tokamak, pedestal, peeling-ballooning instability

Bibliografia

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