Main technological and physical problems of the new torsatron- ''Uragan-3''

Basic technological and physical problems of the ''Uragan-3'' torsatron (U-3) are enumerated. U-3 represents a torsatron without special winding of a toroidal magnetic field. Equiinclined helical winding combined with a compensating winding consisting of two current rings ensures creation of a regulated magnetic configuration with a divertor at the high level of magnetic field induction required for stable plasma confinement. Magnetic surface parameters are given. The divertor specific features are described and U-3 subsequent modernization possibilities are shown: magnetic field increase up to 5 T, using superconducting pumping out facilities of efficiency up to 2x106 l/sec and neutrat particle injectors installation for plasma additional heating. U-3 is to realize two functions: plasma production in the non-current regime of ohmic heating and plasma heating up to high temperature. The HF heating methods which are to be realized in U-3 are enumerated