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View article: Three-Dimensional Electromagnetic High Frequency Concave Cavity Scars
Three-Dimensional Electromagnetic High Frequency Concave Cavity Scars Open
This report examines the localization of high frequency electromagnetic fields in general three-dimensional cavities along periodic paths between opposing sides of the cavity. The focus is on the case where the mirrors at the ends of the o…
View article: Estimated Maximum Electric Fields In A Cavity Supporting Eccentric Coaxial Modes
Estimated Maximum Electric Fields In A Cavity Supporting Eccentric Coaxial Modes Open
Using the power balance method we estimate the maximum electric field on a conducting wall of a cavity containing an interior structure supporting eccentric coaxial modes in the frequency regime where the resonant modes are isolated from e…
View article: Penetration Bounds For Azimuthal Slot On Infinite Cylinder With Finite Length Backing Cylindrical Cavity
Penetration Bounds For Azimuthal Slot On Infinite Cylinder With Finite Length Backing Cylindrical Cavity Open
We examine coupling into azimuthal slots on an infinite cylinder with a infinite length interior cavity operating both at the fundamental cavity modal frequencies, with small slots and a resonant slot, as well as higher frequencies. The co…
View article: Vortex nucleation in superconductors within time-dependent Ginzburg-Landau theory in two and three dimensions: Role of surface defects and material inhomogeneities
Vortex nucleation in superconductors within time-dependent Ginzburg-Landau theory in two and three dimensions: Role of surface defects and material inhomogeneities Open
We use Time-Dependent Ginzburg-Landau theory to study the nucleation of\nvortices in type II superconductors in the presence of both geometric and\nmaterial inhomogeneities. The superconducting Meissner state is meta-stable up\nto a critic…
View article: Analysis of Magnetic Vortex Dissipation in Sn-Segregated Boundaries in Nb$_3$Sn SRF Cavities
Analysis of Magnetic Vortex Dissipation in Sn-Segregated Boundaries in Nb$_3$Sn SRF Cavities Open
We study mechanisms of vortex nucleation in Nb$_3$Sn SRF cavities using a combination of experimental, theoretical, and computational methods. Scanning transmission electron microscopy (STEM) image and energy dispersive spectroscopy (EDS) …
View article: Superconductivity at its Limit: Simulating Superconductor Dynamics Near the Superconducting Superheating Field in Eilenberger and Ginzburg-Landau Theory
Superconductivity at its Limit: Simulating Superconductor Dynamics Near the Superconducting Superheating Field in Eilenberger and Ginzburg-Landau Theory Open
We computationally explore the dynamics of superconductivity near the superheating field in two ways. First, we use a finite element method to solve the time-dependent Ginzburg-Landau equations of superconductivity. We present a novel way …
View article: Role of inhomogeneities for vortex nucleation in superconductors within time-dependent Ginzburg-Landau theory
Role of inhomogeneities for vortex nucleation in superconductors within time-dependent Ginzburg-Landau theory Open
We use Time-Dependent Ginzburg-Landau theory to study the nucleation of vortices in type II superconductors in the presence of geometric and material inhomogeneities. The superconducting Meissner state is meta-stable up to a critical magne…
View article: Ab Initio Calculations on the Growth and Superconducting Properties of Nb₃Sn
Ab Initio Calculations on the Growth and Superconducting Properties of Nb₃Sn Open
In this work, we employ theoretical ab initio techniques to solve mysteries and gain new insights in Nb₃Sn SRF physics. We determine the temperature dependence of Nb₃Sn antisite defect formation energies, and discuss the implications of th…
View article: SRF Theory Developments from the Center for Bright Beams
SRF Theory Developments from the Center for Bright Beams Open
We present theoretical studies of SRF materials from the Center for Bright Beams. First, we discuss the effects of disorder, inhomogeneities, and materials anisotropy on the maximum parallel surface field that a superconductor can sustain …
View article: Computational Exploration of Vortex Nucleation in Type II Superconductors Using a Finite Element Method in Ginzburg-Landau Theory
Computational Exploration of Vortex Nucleation in Type II Superconductors Using a Finite Element Method in Ginzburg-Landau Theory Open
Using a finite element method, we numerically solve the time-dependent Ginzburg-Landau equations of superconductivity to explore vortex nucleation in type II superconductors. We consider a cylindrical geometry and simulate the transition f…