195 citations · 419 across the 28 of their papers we have counts for
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Towards joint optimization of stellarator coils and support structures
Lanke Fu, Alan A. Kaptanoglu
The support structure is an integral part of the design of nuclear fusion reactors, especially 3D stellarator devices. A practical reactor's coils and support structures must have…
Computational boundary specification in 3D fixed-boundary magnetohydrodynamic equilibrium modeling
Alan Kaptanoglu, Tobias Blickhan
Outside the core of the plasma, the plasma current and pressure rapidly transition to zero in a scrape-off or edge region or plasma-vacuum interface. However, existing tools for fi…
A proof-of-concept for automated AI-driven stellarator coil optimization with in-the-loop finite-element calculations
Alan A. Kaptanoglu, Pedro F. Gil
Finding feasible coils for stellarator fusion devices is a critical challenge of realizing this concept for future power plants. Years of research work can be put into the design o…
Permanent magnet optimization of stellarators with coupling from finite permeability and demagnetization effects
Armin Ulrich, Mason Haberle, Alan A. Kaptanoglu
Permanent magnets provide an attractive path for shaping university-scale stellarator magnetic fields. Previous work has shown that greedy permanent magnet optimization (GPMO) can…
A flexible and differentiable coil proxy for stellarator equilibrium optimization
Lanke Fu, Dario Panici, Elizabeth Paul +2
Balancing plasma performance and coil cost is a significant challenge when designing a stellarator power plant. Most current stellarator designs are produced through two-stage opti…
Periodic Korteweg-de Vries soliton potentials generate quasisymmetric magnetic field strength in a finite plasma-beta equilibrium
W. Sengupta, R. Madan, S. Buller +6
Quasisymmetry (QS) is a hidden symmetry of the magnetic field strength, B, that enables effective confinement of charged particles in a fully three-dimensional (3D) toroidal plasma…
Efficient Computation of Stellarator Coils with an Augmented Lagrangian Optimization Method
Pedro F. Gil, Weiping Li, Julianne Stratton +2
Finding feasible coils for stellarator fusion devices is a critical challenge of realizing this concept for future power plants. Current design efforts struggle to navigate the hig…
Optimization of passive superconductors for shaping stellarator magnetic fields
Alan A. Kaptanoglu, Matt Landreman, Michael C. Zarnstorff
We consider the novel problem of optimizing a large set of passive superconducting coils (PSCs) with currents induced by a background magnetic field rather than power supplies. In…
Data-driven methods to discover stable linear models of the helicity injectors on HIT-SIU
Zachary L. Daniel, Alan A. Kaptanoglu, Christopher J. Hansen +3
Accurate and efficient circuit models are necessary to control the power electronic circuits found on plasma physics experiments. Tuning and controlling the behavior of these circu…
Reactor-scale stellarators with force and torque minimized dipole coils
Alan A. Kaptanoglu, Alexander Wiedman, Jacob Halpern +3
In this work, we utilize new coil objectives for stellarator optimization with autodifferentiation, including pointwise and net coil-coil forces and torques. We use these methods t…
Electromagnetic coil optimization for reduced Lorentz forces
Siena Hurwitz, Matt Landreman, Alan Kaptanoglu
The reduction of magnetic forces on electromagnetic coils is an important consideration in the design of high-field devices such as the stellarator or tokamak. Unfortunately, these…
Global Stellarator Coil Optimization with Quadratic Constraints and Objectives
Lanke Fu, Elizabeth J. Paul, Alan A. Kaptanoglu +1
Most present stellarator designs are produced by costly two-stage optimization: the first for an optimized equilibrium, and the second for a coil design reproducing its magnetic co…
Grad-Shafranov equilibria via data-free physics informed neural networks
Byoungchan Jang, Alan A. Kaptanoglu, Rahul Gaur +3
A large number of magnetohydrodynamic (MHD) equilibrium calculations are often required for uncertainty quantification, optimization, and real-time diagnostic information, making M…
Topology optimization for inverse magnetostatics as sparse regression: application to electromagnetic coils for stellarators
Alan A. Kaptanoglu, Gabriel P. Langlois, Matt Landreman
Topology optimization, a technique to determine where material should be placed within a predefined volume in order to minimize a physical objective, is used across a wide range of…
Periodic Korteweg-de Vries soliton potentials generate quasisymmetric magnetic fields
W. Sengupta, N. Nikulsin, S. Buller +6
Quasisymmetry (QS) is a hidden symmetry of the magnetic field strength, B, that effectively confines charged particles in a three-dimensional toroidal plasma equilibrium. Here, we…
Greedy permanent magnet optimization
Alan A. Kaptanoglu, Rory Conlin, Matt Landreman
A number of scientific fields rely on placing permanent magnets in order to produce a desired magnetic field. We have shown in recent work that the placement process can be formula…
Permanent magnet optimization for stellarators as sparse regression
Alan A. Kaptanoglu, Tony Qian, Florian Wechsung +1
A common scientific inverse problem is the placement of magnets that produce a desired magnetic field inside a prescribed volume. This is a key component of stellarator design, and…
A comparison of Fourier and POD mode decomposition methods for high-speed Hall thruster video
J. W. Brooks, M. S. McDonald, A. A. Kaptanoglu
Hall thrusters are susceptible to large-amplitude plasma oscillations that impact thruster performance and lifetime and are also difficult to model. High-speed cameras are a popula…
The structure of global conservation laws in Galerkin plasma models
Alan A. Kaptanoglu, Kyle D. Morgan, Christopher J. Hansen +1
Plasmas are highly nonlinear and multi-scale, motivating a hierarchy of models to understand and describe their behavior. However, there is a scarcity of plasma models of lower fid…
Advanced modeling for the HIT-SI Experiment
Alan A. Kaptanoglu, Thomas E. Benedett, Kyle D. Morgan +2
A two-temperature magnetohydrodynamic (MHD) model, which evolves the electron and ion temperatures separately, is implemented in the PSI-Tet code and used to model plasma dynamics…
Characterizing Magnetized Plasmas with Dynamic Mode Decomposition
Alan A. Kaptanoglu, Kyle D. Morgan, Chris J. Hansen +1
Accurate and efficient plasma models are essential to understand and control experimental devices. Existing magnetohydrodynamic or kinetic models are nonlinear, computationally int…