Journal
PLASMA PHYSICS AND CONTROLLED FUSION
Volume 57, Issue 1, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0741-3335/57/1/014004
Keywords
stellarator; magnetic configuration; neoclassical transport; bootstrap current; optimization
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Funding
- European Union [633053]
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The neoclassical confinement and the bootstrap current are analysed in the configuration space of W7-X by self-consistent neoclassical transport simulations. Since the establishment of quasi-stationary operation is the most important goal for W7-X, the analysis concentrates on high-performance discharge scenarios in magnetic configurations which are adjusted so that bootstrap current vanishes, or, alternatively, on scenarios where the bootstrap current can be balanced by strong ECCD. Both scenarios lead to restrictions either in the configuration space or in plasma parameters and ECRH heating scenarios. Furthermore, the flexibility of the magnetic configuration space of W7-X is briefly described with emphasis on other physics topics of interest, for example, ballooning unstable configurations as well as configurations with a magnetic hill which might lead to interchange instability.
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