학술논문
Classification of Edge Instabilities at Globus-M2 Tokamak.
Document Type
Article
Author
Solokha, V. V.; Kurskiev, G. S.; Yashin, A. Yu.; Balachenkov, I. M.; Varfolomeev, V. I.; Voronin, A. V.; Gusev, V. K.; Goryainov, V. Yu.; Dyachenko, V. V.; Zhiltsov, N. S.; Kiselev, E. O.; Minaev, V. B.; Novokhatsky, A. N.; Petrov, Yu. V.; Ponomarenko, A. M.; Sakharov, N. V.; Telnova, A. Yu.; Tkachenko, E. E.; Tokarev, V. A.; Tolstyakov, S. Yu.
Source
Subject
*TOKAMAKS
*FUSION reactors
*PLASMA currents
*PEDESTALS
*GLOW discharges
*MAGNETIC fields
*CLASSIFICATION
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Language
ISSN
1063-780X
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. [ABSTRACT FROM AUTHOR]