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Design studies of low aspect ratio quasi-omnigenous stellarators

D.A. Spong, S.P. Hirshman, J.C. Whitson, D.B. Batchelor, R. Sanchez, B.A. Carreras, V.E. Lynch, J.F. Lyon, P.M. Valanjua, W.H. Minera, P.E. Morozb, M.C. Zarnstorff c, D.A. Monticelloc, A.S. Wared and L. Garciae

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Significant progress has been made in the development of new, compact stellarator devices that could test optimization principles for the design of a more attractive reactor. These are 3 and 4 field period low aspect ratio quasi-omnigenous stellarators based on an optimization method that aims at improved confinement, stability, ease of coil design, low aspect ratio and low bootstrap current. With respect to the analysis of these devices, the authors have developed improved measures of neoclassical transport, collisionless loss analyses of ICRF tail and α population confinement and methods for the rapid assessment of ballooning stability boundaries.


PACS

52.55.Hc Stellarators, torsatrons, heliacs, bumpy tori, and other toroidal confinement devices

52.25.Fi Transport properties

52.50.Qt Plasma heating by radio-frequency fields; ICR, ICP, helicons

52.35.Py Macroinstabilities (hydromagnetic, e.g., kink, fire-hose, mirror, ballooning, tearing, trapped-particle, flute, Rayleigh-Taylor, etc.)

Subjects

Plasma physics

Dates

Issue 3Y (March 2000)

Received 2 December 1998, accepted for publication 19 March 1999



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