Classification of Edge Instabilities at Globus-M2 Tokamak

被引：7

作者：

Solokha, V. V. ^{[1
]}

Kurskiev, G. S. ^{[1
]}

Yashin, A. Yu. ^{[1
,2
]}

Balachenkov, I. M. ^{[1
]}

Varfolomeev, V. I. ^{[1
]}

Voronin, A. V. ^{[1
]}

Gusev, V. K. ^{[1
]}

Goryainov, V. Yu. ^{[1
]}

Dyachenko, V. V. ^{[1
]}

Zhiltsov, N. S. ^{[1
]}

Kiselev, E. O. ^{[1
]}

Minaev, V. B. ^{[1
]}

Novokhatsky, A. N. ^{[1
]}

Petrov, Yu. V. ^{[1
]}

Ponomarenko, A. M. ^{[2
]}

Sakharov, N. V. ^{[1
]}

Telnova, A. Yu. ^{[1
]}

Tkachenko, E. E. ^{[1
]}

Tokarev, V. A. ^{[1
]}

Tolstyakov, S. Yu. ^{[1
]}

Tukhmeneva, E. A. ^{[1
]}

Khromov, N. A. ^{[1
]}

Shchegolev, P. B. ^{[1
]}

机构：

[1] Russian Acad Sci, Ioffe Inst, St Petersburg 194021, Russia

[2] Peter Great St Petersburg Polytech Univ, St Petersburg 195251, Russia

来源：

PLASMA PHYSICS REPORTS | 2023年 / 49卷 / 04期

基金：

俄罗斯科学基金会;

关键词：

high-temperature plasma; tokamak; pedestal; peeling-ballooning instability; LOCALIZED MODES; POWER THRESHOLD; DIII-D; ELM; PEDESTAL; RECONSTRUCTION; STABILITY;

D O I：

10.1134/S1063780X23600184

中图分类号：

O35 [流体力学]; O53 [等离子体物理学];

学科分类号：

070204 ; 080103 ; 080704 ;

摘要：

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 psi(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.

引用

页码：419 / 427

页数：9

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