Korean scientists have found a way to avoid damaging the tokamak walls because of the instability of the
Tokamak is a type of thermonuclear reactor, it is a toroidal installation for magnetic confinement of plasma in order to achieve the conditions under which a stable thermonuclear reaction is possible. Work with them is conducted for several decades, and the end of this work is not yet visible: there are no economically output reactors, as it was not. One of the problems is the instability of the process, it is very difficult to keep under control.
There are several difficulties, one of them is the instability of localized edge plasma flows. Researchers working with the installation. KSTAR Tokamak demonstrated that they managed to take control of this problem. This is extremely important, because if it is not solved, then the plasma can destroy the inner surface of the vacuum chamber.
learn to choose "Correct" asymmetry, preventing the appearance of those changes in the configuration of the magnetic field, which may prove harmful.
To solve this problem, the researchers created a simplified model of the set of magnetic fields necessary to maintain the plasma in a stable state. Using the example of this model, scientists began to look for variants of an asymmetric configuration that can be useful in maintaining the plasma in a state of stability, preventing the destruction of the reactor walls. One of the conditions here is that the inner layers of the plasma should not be affected by factors that affect the outer layers.
The positive thing is that researchers do not need to know the final version of the exact geometry of the magnetic field. All that is required is to know when the size of the magnetic field becomes too large and its stability will decrease.
Previous studies have been devoted to determining the critical values of fields, as well as creating the necessary geometry, calculating the field. This is necessary in order to cut off the unfavorable for stability versions of the magnetic field configuration.
Now a team of researchers working with the Korean tokamak decided to find out which magnetic fields (additional ones) will suppress the instability, which ones - to prevent the damaging properties of the plasma, and which - to contribute to the appearance of instabilities.
Thanks to the functionality of KSTAR, scientists were able to study a variety of configurations, resulting in a 6D-image, where each pixel has a color coding. In all there are three gradations of color, each of which can be described as good, bad and very bad.
After the model was ready, the scientists tested it by conducting a series of tests. As it turned out, they succeeded in detecting the configuration variant, which neutralizes the instability of localized edge plasma flows. In order to create the optimal configuration, experts can increase the number of electromagnets that will help increase the customization of magnetic fields.
According to experts, the work of scientists with the Korean tokamak will bring closer the moment when humanity will still receive its almost infinite source of energy.
Nature Physics , 2018: DOI: ??? /s41567-018-0268-8 .
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