منابع مشابه
Current dynamics during disruptions in large tokamaks.
Self-consistent modeling of the evolution of the plasma current during disruptions in large tokamaks is presented, taking into account both the generation of runaway electrons and their backreaction on the electric field. It is found that the current profile changes dramatically, so that the postdisruption current carried by runaway electrons is much more peaked than the thermal predisruption c...
متن کاملDevelopment of a fast valve for mitigating disruptions in tokamaks
In support of our disruption mitigation profram, a fast gas valve has been constructed and tested on TEXTOR at FZJ Juelich. Its main features have been shown to be: ~1! rapid response time: 0.5 ms; ~2! amount of injected gas: variable, 2–1000 mbar3l; ~3! linear dependence of the number of injected particles on the gas pressure; ~4! capability of working in a strong magnetic field; ~5! sort of g...
متن کاملPredicting the Onset of Plasma Disruptions in Tokamaks Using Artificial Neural Networks
Artificial neural networks are computer algorithms that simulate, in a very simplified form, the ability of brain neurons to process information. Basically, within each unit of the network, all the input weighted signals are summed and an excitatory or inhibitory signal is then fired to the next layer's units (Fig. 1). The training of the neural net is performed by adjusting the weights between...
متن کاملResistive toroidal stability of internal kink modes in circular and shaped tokamaks
The linear resistive magnetohydrodynamical stability of the n= 1 internal kink mode in tokamaks is studied numerically. The stabilizing influence of small aspect ratio [Holmes et al., Phys. Fluids B 1, 788 (1989)] is confirmed, but it is found that shaping of the cross section influences the internal kink mode significantly. For finite pressure and small resistivity, curvature effects at the q=...
متن کاملMagnetic Turbulence in Tokamaks
-From a discussion of the disruption process, it is concluded that this process plausibly consists of the onset of a fine grain turbulence. This turbulence must be able to produce the large 1 aly values of the inductive electric field which are associated with the reorganization of the c at poloidal flux Y(r) and the current density Z(r) on the magnetic surfaces of radius r. It is then plausibl...
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ژورنال
عنوان ژورنال: Nuclear Fusion
سال: 1978
ISSN: 0029-5515,1741-4326
DOI: 10.1088/0029-5515/18/5/002