期刊名称：Proceedings of the National Academy of Sciences
印刷版ISSN：0027-8424
电子版ISSN：1091-6490
出版年度：1988
卷号：85
期号：20
页码：7423-7425
DOI：10.1073/pnas.85.20.7423
语种：English
出版社：The National Academy of Sciences of the United States of America
摘要：The spectral code BETAS computes plasma equilibrium in a toroidal magnetic field B = [unk]s x [unk]{Psi} with remarkable accuracy because the finite difference scheme employed in the radial direction allows for discontinuities of the flux function {Psi} across the nested surfaces s = const. Instability of higher modes in stellarators like the Heliotron E can be detected in roughly an hour on the best supercomputers by calculating bifurcated equilibria that are defined over just one field period. The method has been validated by comparing results about nonlinear saturation of ballooning modes in tokamaks with numerical data from the PEST code.
