Figures of merit for stellarators near the magnetic axis
نویسندگان
چکیده
A new paradigm for rapid stellarator configuration design has been recently demonstrated, in which the shapes of quasisymmetric or omnigenous flux surfaces are computed directly using an expansion small distance from magnetic axis. To further develop this approach, here we derive several other quantities interest that can be rapidly near-axis expansion. First, $\boldsymbol {\nabla }\boldsymbol {B}$ and tensors computed, used direct derivative-based optimization electromagnetic coil to achieve desired configuration. Moreover, if norm these is large compared with field strength a given field, must have short length scale, suggesting it may hard produce coils suitably far away. Second, evaluate minor radius at surface would become singular, providing lower bound on achievable aspect ratio. This also shown related equilibrium beta limit. Finally, configurations constructed first order expansion, compute error arises due second-order terms.
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ژورنال
عنوان ژورنال: Journal of Plasma Physics
سال: 2021
ISSN: ['1469-7807', '0022-3778']
DOI: https://doi.org/10.1017/s0022377820001658