%0 Journal Article
%T Proto-CIRCUS Tilted-Coil Tokamak-Torsatron Hybrid: Design and Construction
%A A. W. Clark
%A M. Doumet
%A K. C. Hammond
%A Y. Kornbluth
%A D. A. Spong
%A R. Sweeney
%A F. A. Volpe
%J Physics
%D 2014
%I arXiv
%R 10.1016/j.fusengdes.2014.07.012
%X We present the field-line modeling, design and construction of a prototype circular-coil tokamak-torsatron hybrid called Proto-CIRCUS. The device has a major radius R = 16 cm and minor radius a < 5 cm. The six "toroidal field" coils are planar as in a tokamak, but they are tilted. This, combined with induced or driven plasma current, is expected to generate rotational transform, as seen in field-line tracing and equilibrium calculations. The device is expected to operate at lower plasma current than a tokamak of comparable size and magnetic field, which might have interesting implications for disruptions and steady-state operation. Additionally, the toroidal magnetic ripple is less pronounced than in an equivalent tokamak in which the coils are not tilted. The tilted coils are interlocked, resulting in a relatively low aspect ratio, and can be moved, both radially and in tilt angle, between discharges. This capability will be exploited for detailed comparisons between calculations and field-line mapping measurements. Such comparisons will reveal whether this relatively simple concept can generate the expected rotational transform.
%U http://arxiv.org/abs/1410.2309v1