A method of reducing the neoclassical transport coefficients in the l/u regime in £ = 3 and 8 = 2 torsatrons is presented. By appropriately modulating the pitch of the winding law of the helical conductors and applying an additional external transverse magnetic field, a reduction factor of two to four can be achieved.
A study is made of the magnetic field of a solenoid formed by current-carrying loops, the plane of which is perpendicular to a helical line. Analytical expressions are derived for the scalar potential and the components of the magnetic field strength inside a straight solenoid with a dense winding. The toroidal case was investigated using a BESM-6 computer. The results are presented of an experimental study of the magnetic field of a rectilinear system with a helical magnetic axis. The paper discusses the possible design of a toroidal trap with the magnetic configuration in question.
The authors study the structure of the magnetic field in an C = 1 toroidal torsatron. Experiments on the Vint-20 device and numerical calculations on a computer have shown that closed magnetic surfaces with high parameters exist in an { = 1 torsatron. The forms of the magnetic surfaces are given together with graphs showing how their parameters vary within the working volume under different operating conditions. It has been established that the magnetic surface parameters can be adjusted within wide limits by changing the vertical field. It is shown that this type of system is characterized by high inhomogeneity of the magnetic field in the working volume and that this inhomogeneity can be substantially reduced by applying a vertical field or by changing some parameters of the helical winding.
In the 1 = 3, w = 9 URAGAN-3M torsatron an open helical divertor is realized.Plasmas nre RF produced and heated. The time and space &ancleristics of the plasma in the space between two coils of lhe helical winding and on the outward side of the helical winding are studied by microwave and probe techniques. The experimental measurements are preceded by numerical divertor field line tracing. AS B result of the calculations and measurements, it is shown chat the diverted plasma is formed due to (i) plasma transportation from the confinement volume; and (ii) neutral 93s ionization by the near-antenna field. The Row of diverted plasma transported from the confinemen1 volume increases with RF power. This is wnsidered as direct evidence of an increase in particle loss with an incrwe in heating power, the effect having been deduced recently for a stellarator-type device under NBI and ECR heating conditions. An intense RF discharge along open field lines crossing the operating antenna results in a greatly increased diverted plasma density. in the appeamce of a static positive plasma potential up to 150 V near the antenna. and possibly in significant additional RF power loss outside the confinement region.
The integral characteristics of a poloidal divertor tokamak are investigated and the effect of a balancing magnetic field on the stability and shape of the plasma column is analysed. The formation of an ergodic layer near the separatrix in the presence of magnetic field perturbations is considered. On the basis of the calculations that are made, requirements are formulated for the accuracy to which the magnetic system must be produced, and a preliminary design of such a system for the TB-0 poloidal divertor tokamak is suggested.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.