Bulletin of the American Physical Society
65th Annual Meeting of the APS Division of Plasma Physics
Monday–Friday, October 30–November 3 2023; Denver, Colorado
Session PP11: Poster Session VI:
MFE:DIII-D and conventional tokamaks II;MHD and stability; Analytic techniques in MFE;
ICF: Pinches and hohlraum physics
SPACE: Astrophysical plasmas
LTP:Low temperature plasma applications
MC:Miniconference: Shocks
2:00 PM - 5:00 PM
Wednesday, November 1, 2023
Room: Plaza ABC
Abstract: PP11.00060 : Numerical near-axis expansion of weakly quasisymmetric MHS equilibria to all orders
Presenter:
Lanke Fu
(Princeton University)
Authors:
Lanke Fu
(Princeton University)
Amitava Bhattacharjee
(Princeton University)
Eduardo Rodriguez
(Max Planck Institute for Plasma Physics - Greifswald)
We present pyAQSC, the first numerical near-axis expansion code for anisotropic QS equilibria to any order. We also present numerical correlations of the optimal truncation and divergence rate to common QS metrics. In all examined cases, the expansion diverges after the 4th order, consistent with the accuracy of scalar pressure NAE.[5] Our code explores new regions in QS configuration space by relaxing pressure isotropy. It allows the study of higher order quantities, like magnetic shear, without special parameter choices. PyAQSC supports GPU acceleration and auto differentiation. Along with a new anisotropic equilibrium solver developed for DESC, it provides an efficient tool for designing QS stellarators.
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