Topology-mediated approach to the design of quasisymmetric stellarators

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Magnetic confinement fusion designs require careful consideration for them to confine particles effectively. A possible way to do so is to impose quasisymmetry. In practice, large-scale optimizations are performed to minimize deviations from exact quasisymmetry. Unfortunately, the large number of parameters and complexity of the optimization process make it challenging to organize and interpret the designs thus obtained. In this Letter, we present a novel topology-mediated description of configurations to describe the space of configurations in a reduced model with a small number of parameters. We show that this approach reproduces existing designs and proves powerful to find potentially attractive new designs, an explicit example of which is presented.

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