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Title: Geometric concepts for stellarator permanent magnet arrays

Abstract

The development of stellarators that use permanent magnet arrays to shape their confining magnetic fields has been a topic of recent interest, but the requirements for how such magnets must be shaped, manufactured, and assembled remain to be determined. To address these open questions, we have performed a study of geometric concepts for magnet arrays with the aid of the newly developed MAGPIE code. A proposed experiment similar to the National Compact Stellarator Experiment (NCSX) is used as a test case. Two classes of magnet geometry are explored: curved bricks that conform to a regular grid in cylindrical coordinates, and hexahedra that conform to the toroidal plasma geometry. In addition, we test constraints on the magnet polarization. While magnet configurations constrained to be polarized normally to a toroidal surface around the plasma are unable to meet the required magnetic field parameters when subject to physical limitations on the strength of present-day magnets, configurations with unconstrained polarizations are shown to satisfy the physics requirements for a targeted plasma.

Authors:
; ; ; ; ;
Publication Date:
DOE Contract Number:  
AC02-09CH11466
Product Type:
Dataset
Research Org.:
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Sponsoring Org.:
USDOE
Keywords:
stellarator, permanent magnet, optimization
OSTI Identifier:
1661172
DOI:
https://doi.org/10.11578/1661172

Citation Formats

Hammond, K C, Zhu, C, Brown, T, Corrigan, K, Gates, D A, and Sibilia, M. Geometric concepts for stellarator permanent magnet arrays. United States: N. p., 2020. Web. doi:10.11578/1661172.
Hammond, K C, Zhu, C, Brown, T, Corrigan, K, Gates, D A, & Sibilia, M. Geometric concepts for stellarator permanent magnet arrays. United States. doi:https://doi.org/10.11578/1661172
Hammond, K C, Zhu, C, Brown, T, Corrigan, K, Gates, D A, and Sibilia, M. 2020. "Geometric concepts for stellarator permanent magnet arrays". United States. doi:https://doi.org/10.11578/1661172. https://www.osti.gov/servlets/purl/1661172. Pub date:Thu Sep 03 00:00:00 EDT 2020
@article{osti_1661172,
title = {Geometric concepts for stellarator permanent magnet arrays},
author = {Hammond, K C and Zhu, C and Brown, T and Corrigan, K and Gates, D A and Sibilia, M},
abstractNote = {The development of stellarators that use permanent magnet arrays to shape their confining magnetic fields has been a topic of recent interest, but the requirements for how such magnets must be shaped, manufactured, and assembled remain to be determined. To address these open questions, we have performed a study of geometric concepts for magnet arrays with the aid of the newly developed MAGPIE code. A proposed experiment similar to the National Compact Stellarator Experiment (NCSX) is used as a test case. Two classes of magnet geometry are explored: curved bricks that conform to a regular grid in cylindrical coordinates, and hexahedra that conform to the toroidal plasma geometry. In addition, we test constraints on the magnet polarization. While magnet configurations constrained to be polarized normally to a toroidal surface around the plasma are unable to meet the required magnetic field parameters when subject to physical limitations on the strength of present-day magnets, configurations with unconstrained polarizations are shown to satisfy the physics requirements for a targeted plasma.},
doi = {10.11578/1661172},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2020},
month = {9}
}