Physics Design of a High Beta-Quasi-Axisymmetrix Stellarator
Key physics issues in the design of a high-beta quasi-axisymmetric stellarator configuration are discussed. The goal of the design study is a compact stellarator configuration with aspect ratio comparable to that of tokamaks and good transport and stability properties. Quasi-axisymmetry has been used to provide good drift trajectories. Ballooning stabilization has been accomplished by strong axisymmetric shaping, yielding a stellarator whose core is in the second stability regime for ballooning modes even in the absence of a conducting wall. The resulting configuration is also found to be robustly stable o vertical modes, increasing the freedom to perform axisymmetric shaping. Stability to neoclassical tearing modes is conferred by a monotically increasing profile. A gyrokinetic code has been used to confirm the adequacy of the neoclassical confinement. Neutral beam losses have been evaluated with Monte Carlo codes.
Bibliographic Reference: Article: Plasma Physics and Controlled Fusion 41 (1999), B273-B283
Record Number: 200011778 / Last updated on: 2000-02-12
Original language: en
Available languages: en