English to Russian Tech/Engineering Nuclear Eng/Sci Управление магнитным полем плазмы

As mentioned herein before, the majority of the magnetic field in a magnetized plasma is created by currents flowing in the plasma itself and/or in the wall of the flux conserving chamber. The magnetic field in the magnetized plasma confinesplasma energy by suppressing the transit of heat and particles from the core of the plasma to its edge. Since the path of charged particles in a magnetic field is confined to spirals that travel along field lines great care should be taken to ensure that the magnetic field lines run in the toroidal and poloidal direction but not along the radial direction to avoid a direct route from the core to the edge of the plasma. The ratio of toroidal to poloidal field on a flux surface can best be described by tracing out a field line and counting the number of toroidal turns it completes before completing one poloidal turn and this number is called a safety factor or q-factor. “q -profile” as used herein below means value of the plasma’s q-factor along its radius. q-factor at the plasma’s core is in general different than q-factor at the plasma’s edge, so q-profile is plasma’s q-factor along its radius. In general, the safety factor is q=m/n, where, m is oscillation in poloidal direction and n is oscillation in toroidal direction. When q is a rational number (number expressed as fraction of two integers m and n) and integers m and n have low values (e.g. value of m and n less than 3) the plasma will resonate and will develop an asymmetry. Often this asymmetry rotates around the torus and can be detected by the phase of the signals obtained from the sensors as an oscillation in time. Such an asymmetry can reduce the heat confinement of the plasma configuration.

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