Abstract Details
Abstracts
Author: Julio E Herrera-Velázquez
Requested Type: Poster
Submitted: 2026-02-25 16:23:51
Co-authors: Kassandra Salguero-Martínez
Contact Info:
Instituto de Ciencias Nucleares, UNAM
Circuito Exterior S/N
Mexico City, Mexico City 04510
Mexico
Abstract Text:
Starting from the design for the simple Columbia Non-neutral Torus (CNT) proposed by Pedersen and Boozer (Phys. Rev. Lett. $textbf{88}$ 205002(2002)), and later recovered by Yu et al. (J. Plasma Phys. $textbf{88}$ 905880306 (2022)), this work explores axisymmetric equilibria using two planar vertical field coils and two non-planar intertwined coils. Neoclassical optimization studies are made in a single stage approach using the DESC stellarator equilibrium solver (Dudt and Koleman, Phys. Plasmas $textbf{27}$ (2020) 102513). The physical parameters used as input were the rotational transform $iota(s)$ as a function of $s$, the toroidal magnetic flux function, the number of field periods, and an initial equilibrium assumption, given the major radius $R_0$ and the minor radius $a$. Once the equilibrium given by the coil configuration is defined, an optimization is made for quasi-symmetry. In these preliminary results, a triple product metric as defined by Dudt et al., (J. Plasma Phys. $textbf{89}$ (2023) 95589020) is used as a local error indicator, which is evaluated without resorting to Boozer coordinates. The goal is to optimize the effective ripple $varepsilon_{eff}^{3/2}$, thus decreasing the neoclassical transport in the low collisionality regime $1/nu$. As a result, a quasi-axisymmetric configuration with reasonably good neoclassical transport, in the sense of Boozer coordinates, is found. In the best case scenarios the final rotational transfrom is inverted.
Characterization: 1.0
Comments:
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