排序方式: 共有3条查询结果,搜索用时 62 毫秒
1
1.
Stefanovskii A. M. Dremin M. M. Kakurin A. M. Kislov A. Ya. Notkin G. E. Pavlov Yu. D. Sushkov A. V. 《Plasma Physics Reports》2019,45(12):1142-1163
Plasma Physics Reports - Experimental data on plasma cooling during slow discharge disruptions at the T-10 tokamak are analyzed. It is shown that, in the initial phase of thermal quench at T-10,... 相似文献
2.
A. M. Stefanovskii 《Plasma Physics Reports》2011,37(2):97-108
The processes that are likely to accompany discharge disruptions and sawteeth in a tokamak are considered in a simple plasma
current model. The redistribution of the current density in plasma is supposed to be primarily governed by the onset of the
MHD-instability-driven turbulent plasma mixing in a finite region of the current column. For different disruption conditions,
the variation in the total plasma current (the appearance of a characteristic spike) is also calculated. It is found that
the numerical shape and amplitude of the total current spikes during disruptions approximately coincide with those measured
in some tokamak experiments. Under the assumptions adopted in the model, the physical mechanism for the formation of the spikes
is determined. The mechanism is attributed to the diffusion of the negative current density at the column edge into the zero-conductivity
region. The numerical current density distributions in the plasma during the sawteeth differ from the literature data. 相似文献
3.
A. M. Stefanovskii M. M. Dremin A. M. Kakurin A. Ya. Kislov S. G. Mal’tsev G. E. Notkin Yu. D. Pavlov V. I. Poznyak A. V. Sushkov 《Plasma Physics Reports》2013,39(6):425-443
The results of experimental studies of discharge disruptions in the T-10 tokamak at the limiting plasma density are presented. On the basis of measurements of the generated soft X-ray emission, for a group of “slow” disruptions, the dynamics of the magnetic configuration of the central part of the plasma column is studied and the possible role of the m/n = 1/1 mode in the excitation of predisruptions or the final stage of disruption is analyzed. It is shown that the characteristics of plasma electron cooling in predisruptions correspond to those of electron cooling upon pellet injection into T-10 and in discharge predisruptions occurring in regimes with the “quiet mode.” It is found that, in the latter case, the reason for predisruptions and fast electron cooling in the plasma core is the instability of the m/n = 2/1 mode, its spontaneous spatial reconstruction, and the generation of a “cooling wave” during this process. Measurements of the electron temperature (determined from the plasma radiation intensity at the second electron cyclotron harmonic) in the zone of the m/n = 2/1 mode have shown that the transformation of the m/n = 2/1 mode leads to the excitation of predisruptions and the final phase of disruption not only in regimes with the “quiet mode,” but also in disruptions of ordinary ohmic discharges. The experimental results obtained in this work make it possible to determine the scenario of the development of “slow” discharge disruptions in the T-10 tokamak at the limiting plasma density. 相似文献
1