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Turnstile area as a measure for chaotic transport in magnetic confinement fusion devices

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arxiv 2503.15792 v3 pith:32OCF4YO submitted 2025-03-20 physics.plasm-ph

classification physics.plasm-ph
keywords magneticareaturnstileconfinementdevicesfieldsfusionmanifolds
verification ladder T0 review T1 audit T2 compute T3 formal
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We analyze stochasticity in the magnetic fields of magnetic confinement fusion reactors by calculating the lobe areas of turnstiles - a method developed for characterizing transport into and out of resonance zones in Hamiltonian dynamical systems. We develop an efficient algorithm based on an action principle to calculate this quantity directly from the magnetic field, including stellarator magnetic fields which are sourced by a complicated set of three-dimensional coils. In the analyzed devices, the turnstile area on the inboard (plasma-facing) manifolds is much smaller than the turnstile area on the outboard (wall-facing) manifolds. The application of the turnstile area calculation for the design of future reactors will be discussed.

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Cited by 2 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Computational studies of giant edge islands and unpaired X-points in HSX and W7-X by manipulating coil currents

    physics.plasm-ph 2026-07 conditional novelty 6.0 of 10

    Reducing current in the coil nearest the straight section of HSX or W7-X creates giant edge islands and unpaired X-points far outside the previously studied configuration space.

  2. Surfaces with Klein bottle topology occur in fusion reactor fields

    physics.plasm-ph 2025-06 conditional novelty 6.0 of 10

    Magnetic surfaces in fusion devices are not always tori: a period-doubling bifurcation at half-integer rotational transform creates separatrix surfaces with the topology of an immersed (lemniscate) Klein bottle, demon...

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