Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Optimized finite-build stellarator coils using automatic differentiation   A new stellarator coil design code is introduced that optimizes the position
and winding pack orientation of finite-build coils. The new code, called
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 automatic differentiation.
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 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 2.5mm
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.

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The categories of this paper are: hep-ph
25
The categories of this paper are: patt-sol
16
The categories of this paper are: stat
12
The categories of this paper are: nucl-th
31
The categories of this paper are: ao-sci
2
The categories of this paper are: math
6
The categories of this paper are: astro-ph
1
The categories of this paper are: cs
13
The categories of this paper are: quant-ph
35
The categories of this paper are: mtrl-th
37
The categories of this paper are: supr-con
26
The categories of this paper are: bayes-an
32
The categories of this paper are: atom-ph
9
The categories of this paper are: nlin
23
The categories of this paper are: solv-int
24
The categories of this paper are: dg-ga