RF losses in selective laser melted GRCop-84 copper waveguide for an additively manufactured lower hybrid current drive launcher
Not Available
Seltzman, A. H. (ORCID:0000000277252981)↗
SEARCH · Engineering Papers
Results for “WAVEGUIDES”
Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
Quote a phrase for an exact phrase match. Source license links do not imply unrestricted reuse.
Theoretical band-gap bounds and coupling sensitivity for a waveguide with periodically attached resonating branches
Not Available
Bastawrous, Mary V. (ORCID:0000000326888995)↗
Control of wakefield in sub-THz dielectric-lined waveguides using multiple-bunch excitation
Beam-driven wakefield accelerators offer the potential to achieve accelerating fields approaching the sub-GV/m range, paving the way for compact and cost-effective next-generation high-energy colliders. This method typically employs a two-bunch system: a drive bunch that excites an electromagnetic wakefield in a solid-state or plasma medium, and a witness bunch that extracts energy from the wake for acceleration. Our research focuses on two key challenges in wakefield acceleration using structures. First, we investigate strategies to suppress transverse instabilities by employing non-cylindrical geometries that damp dipole modes. Second, we explore methods to precisely terminate the wakefield after the interaction region, thereby improving the efficiency of energy transfer. This paper presents detailed simulation results and the corresponding experimental design developed to validate these concepts. Furthermore, the proposed experiment will be carried out at the Argonne Wakefield Accelerator (AWA) facility, focusing on controlling wakefield duration through tailored drive and witness bunch configurations and evaluating dielectric-lined structures with non-cylindrical cross sections.
43 PARTICLE ACCELERATORS↗
Spatially Resolved Anion Diffusion and Tunable Waveguides in Bismuth Halide Perovskites
Not provided.
Chemistry↗
In-Plane Anisotropy in Biaxial ReS 2 Crystals Probed by Nano-Optical Imaging of Waveguide Modes
Not provided.
Materials Science↗
Silicon Nitride Waveguides with Intrinsic Single-Photon Emitters for Integrated Quantum Photonics
Not provided.
Materials Science↗
Reconstruction of evolving nanostructures in ultrathin films with X-ray waveguide fluorescence holography
Not Available
36 MATERIALS SCIENCE↗
Single-shot electrical detection of short-wavelength magnon pulse transmission in a magnonic thin-film waveguide
Abstract The advance of magnon spintronics requires understanding of time-domain magnon pulse transmission in order to develop high-speed information processing protocols. In this work, we demonstrate single-shot electrical detection of narrow-band magnon pulse transmission in a yttrium iron garnet thin-film delay line. The high signal-to-background ratio of magnon transmission band allows us to directly probe the magnon transmission electrically using a fast oscilloscope and to study its spectral evolution using Fast Fourier Transform (FFT) of the time-domain transmitted signal. At elevated input power, we show a magnon transmission reduction and a spectral distortion, which can be understood by the nonlinear magnon excitation in the transmission band defined by the antenna geometry. In addition, we also find that the higher- (lower-) frequency magnon spectral component exhibits a lower (higher) magnon group velocity, showing a dispersion agreeing with the Damon-Eshbach dependence. Our results provide important guidance of magnon pulse engineering for their applications in spin wave computing and coherent magnon information processing.
Song, Moojune↗
Quantum states of cylindrical surface charge density for modeling plasmonic circuit elements: Nanowires, nanorods, cavities, and waveguides
Nanostructures in the form of ellipsoids, prolate spheroids, rings, and cylinders are known to exhibit resonant surface and cavity modes with applications in nanophotonics and plasmonics and, more recently, in novel quantum experiments, in which control of plasmons and their interactions with plasmons, photons, phonons, excitons, and quantum emitters are desired. Nanorods and nanowires are examples of plasmonic structures with spectral properties of potential use as interconnects and circuit components. Additionally, estimates of the surface properties of these components are needed in circuit design and integrated systems. Here, we present a quantum Hamiltonian for the cylindrical surface charge density. We then study the photon excitation of plasmons on the cylindrical surface and calculate their scattering and radiative decay rate. Nonradiative decay of plasmons induces an efficient heating of the nanoparticle and can photoacoustically excite mechanical oscillations. Computational calculations are also presented for the plasmonic modes and the ensuing excitations of nanomechanical eigenmodes of nanoparticles with near-cylindrical symmetries.
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND↗