Mainz 2022 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 5: Helmholtz Graduated School HEPP I
P 5.3: Vortrag
Montag, 28. März 2022, 16:50–17:05, P-H12
Non-Resonant Divertor Design for Compact Toroidal Hybrid (CTH) — •Kelly Garcia1, Aaron Bader1, Heinke Frerichs1, Gregory Hartwell2, John Schmitt2, and Oliver Schmitz1 — 1University of Wisconsin-Madison, Madison, WI USA — 2Auburn University, Auburn, AL USA
Non-resonant divertors separate the confined plasma from surrounding structures with the resulting boundary region comprised of cantori and/or stochastic regions, but without the presence of large islands. Compact Toroidal Hybrid (CTH) can serve as a test-bed for non-resonant divertor solutions. The background field coils and the ohmic current drive system of CTH are used to alter the rotational transform between 0.3 < ι < 0.75. Utilizing the FLARE field-line following code, we show the presence of a chaotic edge fieldline structure which evolves with current. These chaotic structures are related to topologically relevant transport mechanisms which we aim to explore. We calculate strike point locations for the exiting plasma for multiple ohmic current values. The calculated strike point locations enable us to design and numerically test an instrumented divertor plate with FLARE which can then be used to experimentally measure non-resonant divertor resiliencies with respect to equilibrium changes. The test plate configuration is designed to intercept most of the divertor flux over a wide range of currents. A physical plate is planned to be placed in CTH where we expect to calculate expected heat flux on this plate. We attempt to calculate optimal plate position locations within CTH.