|
|
|
Optimized finite-build stellarator coils using automatic differentiation-
Article in a journal
- | |
|
Area
Nuclear Fusion |
Author(s)
N. McGreivy
, S. R. Hudson
, C. Zhu
|
Published in
Nuclear Fusion |
Year
2021 |
Publisher
IOP Publishing |
Abstract
A new stellarator coil design code is introduced that optimizes the position and winding pack orientation of finite-build coils. The new code, called flexible optimized curves in space using automatic differentiation (ad) and finite build (FOCUSADD), performs gradient-based optimization in a high-dimensional, non-convex space. The derivatives with respect to parameters of finite-build coils are easily and efficiently computed using ad. FOCUSADD parametrizes coil positions in free space using a Fourier series and uses a multi-filament approximation to the coil winding pack. The orientation of the winding pack is parametrized with a Fourier series and can be optimized as well. Optimized finite-build coils for a Wendelstein 7-X (W7-X)-like stellarator are found, and compared with filamentary coil results. The final positions of optimized finite-build W7-X-like coils are shifted, on average, by approximately 2.5 mm relative to optimized filamentary coils. These results suggest that finite-build effects should be accounted for in the optimization of stellarators with low coil tolerances. |
AD Tools
JAX |
BibTeX
@ARTICLE{
McGreivy2021Ofb,
doi = "10.1088/1741-4326/abcd76",
url = "https://doi.org/10.1088/1741-4326/abcd76",
year = "2021",
month = "jan",
publisher = "{IOP} Publishing",
volume = "61",
number = "2",
pages = "026020",
author = "N. McGreivy and S. R. Hudson and C. Zhu",
title = "Optimized finite-build stellarator coils using automatic differentiation",
journal = "Nuclear Fusion",
abstract = "",
ad_area = "Nuclear Fusion",
ad_tools = "JAX"
}
| |
back
|
|
