A5014325022- Magnetic confinement fusion research
- Ionosphere and magnetosphere dynamics
- Laser-Plasma Interactions and Diagnostics
- Solar and Space Plasma Dynamics
- Physics of Superconductivity and Magnetism
- Microwave Engineering and Waveguides
- Particle accelerators and beam dynamics
- Fusion materials and technologies
- Advanced Antenna and Metasurface Technologies
- Stellar, planetary, and galactic studies
- Microwave and Dielectric Measurement Techniques
University of Maryland, College Park
2021-2024
Princeton University
2024
Montgomery High School
2021
We present new stellarator equilibria that have been optimized for reduced turbulent transport using nonlinear gyrokinetic simulations within the optimization loop. The routine involves coupling pseudo-spectral GPU-native code GX with equilibrium and DESC . Since allows fast simulations, we directly optimize heat fluxes. To handle noisy flux traces returned by these employ simultaneous perturbation stochastic approximation (SPSA) method only uses two objective function evaluations a simple...
Turbulent transport is regarded as one of the key issues in magnetic confinement nuclear fusion, both for tokamaks and stellarators. In this work, we show that a significant decrease microstability-based proxy, opposed to geometric one, turbulent heat flux, namely quasilinear can be obtained an efficient manner by coupling stellarator optimization with linear gyrokinetic simulations. This accomplished computing flux at each step process, well deviation from quasisymmetry, minimizing their...
GX is a code designed to solve the nonlinear gyrokinetic system for low-frequency turbulence in magnetized plasmas, particularly tokamaks and stellarators. In GX, our primary motivation target fast solver that can be used fusion reactor design optimization along with wide-ranging physics exploration. This has led several algorithm decisions, specifically chosen prioritize time solution. First, we have discretization pseudospectral entire phase space, including Laguerre–Hermite formulation of...
In this work we consider the problem of optimizing a stellarator subject to hard constraints on design variables and physics properties equilibrium. We survey current numerical methods for handling these constraints, summarize number from wider optimization community that have not been used extensively thus far. demonstrate utility new constrained by quasi-axisymmetric favourable while preventing strong shaping plasma boundary, which can be difficult create with external sources.
A heat exchanger, based on a millimeter-wave absorbing ceramic composite, is under development. This article describes 1-D finite-difference model that used in the design of exchanger. The purpose this to offer tool can rapidly estimate overall performance fast allows for absorber be evaluated over wide parameter space as opposed 3-D time-domain methods, which provide accurate results but require substantially more computational resources. enables quick calculations by approximating electric...
Small-amplitude, symmetry-breaking magnetic field perturbations, including resonant perturbations (RMPs) and error fields, can profoundly impact plasma properties in both tokamaks stellarators. In this work, we perform the first comparison between Stepped Pressure Equilibrium Code (SPEC) (a comparatively fast efficient equilibrium code based on energy-minimisation principles) M3D-C $^{1}$ high-fidelity albeit computationally expensive initial-value extended-magnetohydro- dynamic (MHD) code)...
A simplified analytical form of the on-axis magnetic well and Mercier's criterion for interchange instabilities arbitrary three-dimensional field geometries is derived. For this purpose, a near-axis expansion based on direct coordinate approach used by expressing toroidal flux in terms powers radial distance to axis. first time, are then written as one-dimensional integral with respect axis arclength. When compared original work Mercier, derivation here presented using modern notation more...