Zobrazeno 1 - 10
of 121
pro vyhledávání: '"Cerfon, Antoine"'
Autor:
Mayani, Sonali, Montanaro, Veronica, Cerfon, Antoine, Frey, Matthias, Muralikrishnan, Sriramkrishnan, Adelmann, Andreas
Vico et al. (2016) suggest a fast algorithm for computing volume potentials, beneficial to fields with problems requiring the solution of Poisson's equation with free-space boundary conditions, such as the beam and plasma physics communities. Current
Externí odkaz:
http://arxiv.org/abs/2405.02603
In a recent publication (Toler et al. 2023), we demonstrated that for axisymmetric geometries, the Kapur-Rokhlin quadrature rule provided an efficient and high-order accurate method for computing the normal component, on the plasma surface, of the ma
Externí odkaz:
http://arxiv.org/abs/2404.02799
We introduce a novel particle-in-Fourier (PIF) scheme that extends its applicability to non-periodic boundary conditions. Our method handles free space boundary conditions by replacing the Fourier Laplacian operator in PIF with a mollified Green's fu
Externí odkaz:
http://arxiv.org/abs/2403.13911
This work introduces meta estimators that combine multiple multifidelity techniques based on control variates, importance sampling, and information reuse to yield a quasi-multiplicative amount of variance reduction. The proposed meta estimators are p
Externí odkaz:
http://arxiv.org/abs/2301.07280
We present a robust optimization algorithm for the design of electromagnetic coils that generate vacuum magnetic fields with nested flux surfaces and precise quasi-symmetry. The method is based on a bilevel optimization problem, where the outer coil
Externí odkaz:
http://arxiv.org/abs/2210.03248
Autor:
Muralikrishnan, Sriramkrishnan, Frey, Matthias, Vinciguerra, Alessandro, Ligotino, Michael, Cerfon, Antoine J., Stoyanov, Miroslav, Gayatri, Rahulkumar, Adelmann, Andreas
We perform a scaling and performance portability study of the particle-in-cell scheme for plasma physics applications through a set of mini-apps we name "Alpine", which can make use of exascale computing capabilities. The mini-apps are based on Indep
Externí odkaz:
http://arxiv.org/abs/2205.11052
Stochastic and a posteriori optimization to mitigate coil manufacturing errors in stellarator design
It was recently shown in [Wechsung et. al., Proc. Natl. Acad. Sci. USA, 2022] that there exist electromagnetic coils that generate magnetic fields which are excellent approximations to quasi-symmetric fields and have very good particle confinement pr
Externí odkaz:
http://arxiv.org/abs/2203.10164
We propose a new method to compute magnetic surfaces that are parametrized in Boozer coordinates for vacuum magnetic fields. We also propose a measure for quasi-symmetry on the computed surfaces and use it to design coils that generate a magnetic fie
Externí odkaz:
http://arxiv.org/abs/2203.03753
In the design of stellarators, energetic particle confinement is a critical point of concern which remains challenging to study from a numerical point of view. Standard Monte Carlo analyses are highly expensive because a large number of particle traj
Externí odkaz:
http://arxiv.org/abs/2108.06408
We extend the single-stage stellarator coil design approach for quasi-symmetry on axis from [Giuliani et al, 2020] to additionally take into account coil manufacturing errors. By modeling coil errors independently from the coil discretization, we hav
Externí odkaz:
http://arxiv.org/abs/2106.12137