Scattering of electromagnetic waves by cylinder inside uniaxial hyperbolic medium
Not Available
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS↗
SEARCH · Engineering Papers
Results for “ELECTROMAGNETISM”
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.
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4π-spherically focused electromagnetic wave: diffraction optics approach and high-power limits
Not Available
42 ENGINEERING↗
IS&T CoDesign Summer School 2012 Lessons Learned: A 2D, implicit, energy- and charge- conserving electromagnetic particle in cell method [Slides]
Recently, a fully implicit electrostatic 1D charge- and energy- conserving particle-in-cell algorithm was proposed and implemented. Central to the algorithm is an advanced particle pusher. Particles are moved using an energy conserving scheme and are forced to stop at cell faces to conserve charge. Moreover, a time estimator is used to control errors in momentum. Here we implement and extend this advanced particle pusher to include 2D and electromagetic fields. Special consideration is taken to ensure easy coupling into the implicit moment. Focus is then given to optimizing the presented particle pusher on emerging architectures. Two multicore implementations, and one GPU (Graphics Processing Unit) implementation are discussed and analyzed.
70 PLASMA PHYSICS AND FUSION TECHNOLOGY↗
Studies of the Electromagnetic Structure of Mesons at Jefferson Lab
The Jefferson Laboratory Hall B PrimEx Collaboration is using tagged photons to perform an absolute 1.4% level cross section measurement of the photoproduction of neutral pions in the Coulomb field of a nucleus. The absolute cross section for this process is directly proportional to the neutral pion radiative decay width and consequently the uncertainty in the luminosity is directly reflected in the final error bar of the measurement. The PI has taken primary responsibility for the photon flux determination and in this technical report, we outline the steps taken to limit the uncertainty in the tagged photon flux to the 1% level. These include the use of a total absorption counter for absolute flux calibration, a pair spectrometer for online relative flux monitoring, and updated procedures for postbremsstrahlung electron counting. The photon tagging technique has been used routinely in its various forms to provide quasimonochromatic photons for absolute photonuclear cross section measurements. The analysis of such experiments in the context of bremsstrahlung photon tagging was summarized by Owens in 1990. Since then, a number of developments have made possible significant improvements in the implementation of this technique. Here, we describe the steps taken by the PrimEx Collaboration in Hall B of Jefferson Laboratory to limit the systematic uncertainty in the absolute photon flux to 1%. They include an absolute flux calibration at low intensity with a total absorption counter, online relative flux monitoring with a pair spectrometer, and the use of multihit time to digital converters for post bremsstrahlung electron counting during production data runs. While this discussion focuses on the analysis techniques utilized by the PrimEx Collaboration which involves a bremsstrahlung based photon tagging system to measure the neutral pion lifetime, the methods described herein readily apply to other types of photon tagging systems.
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND ↗
Electromagnetic Pulses from Hypervelocity Meteoroid Particle Impacts (HMPI) on Spacecraft [Slides]
Abstract not provided.
79 ASTRONOMY AND ASTROPHYSICS↗
Iron Mountain Electromagnetic Results
Iron Mountain Mine is located seventeen miles northwest of Redding, CA. After the completion of mining in early 1960s, the mine workings have been exposed to environmental elements which have resulted in degradation in water quality in the surrounding water sheds. In 1985, the EPA plugged ore stoops in many of the accessible mine drifts in an attempt to restrict water flow through the mine workings. During this process little data was gathered on the orientation of the stoops and construction of the plugs. During the last 25 years, plugs have begun to deteriorate and allow acidic waters from the upper workings to flow out of the mine. A team from Idaho National Laboratory (INL) performed geophysical surveys on a single mine drift and 3 concrete plugs. The project goal was to evaluate several geophysical methods to determine competence of the concrete plugs and orientation of the stopes.
58 GEOSCIENCES↗
Nano-Antenna Electromagnetic Energy Gathering Film
RedWave Energy Inc. entered into a CRADA with BEA to leverage and license nanoantenna technology. The scope of work involved the systematic development and advancement of software modeling/simulation tools, material analysis methods, and fabrication procedures applicable to nanoantennas. The strategy is composed of three elements: nano-antenna technology from the Department of Energy’s Idaho National Laboratories (INL), High Speed Diodes (Metal Insulator Metal) from the University of Colorado, roll-to-roll fabrication from MicroContinuum, Inc.
99 GENERAL AND MISCELLANEOUS↗
Annual Report on Numerical Study of Strong and Coherent Radiation of Terahertz Electromagnetic Waves from High-Tc Superconductors
This report describes the radiation of cupate superconductors.
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND↗
Manipulation of Electromagnetic Fields with Plasmonic Nanostructures and Metamaterials
Abstract Not Provided
Material Science↗
The cause of outliers in electromagnetic pulse (EMP) locations
We present methods to calculate the location of EMP pulses when observed by 5 or more satellites. Simulations show that, even with a good initial guess and fitting a location to all of the data, there are sometime outlier results whose locations are much worse than most cases. By comparing simulations using different ionospheric transfer functions (ITFs), it appears that the outliers are caused by not including the additional path length due to refraction rather than being caused by not including higher order terms in the Appleton-Hartree equation. We suggest ways that the outliers can be corrected. These correction methods require one to use an electron density profile along the line of sight from the event to the satellite rather than using the total electron content (TEC) to characterize the ionosphere.
99 GENERAL AND MISCELLANEOUS↗
Atomic Interferometry with Detuned Counter-Propagating Electromagnetic Pulses
Atomic fountain interferometry uses atoms cooled with optical molasses to 1 μK, which are then launched in a fountain mode. The interferometer relies on the nonlinear Raman interaction of counter-propagating visible light pulses. We present models of these key transitions through a series of Hamiltonians. Our models, which have been verified against special cases with known solutions, allow us to incorporate the effects of non-ideal pulse shapes and realistic laser frequency or wavevector jitter.
42 ENGINEERING↗
Highlights of INT Program 14-3: Heavy Flavor and Electromagnetic Probes
The Institute for Nuclear Theory program, Heavy Flavor and Electro- magnetic Probes in Heavy-Ion Collisions (INT 14-3), was held 15 September to 10 October 2014. In addition to the four organizers: Ramona Vogt (LLNL and UC Davis), Peter Petreczky (BNL), Anthony Frawley (Florida State), and Enrico Scomparin (INFN Torino), the program was attended by 34 other participants spread out over the four week period. Almost all participants were recognized experts in the field and were invited to take part. Eight of the participants were postdocs and five were women. There are two main thrusts to the study of heavy quarks and quarkonia in heavy-ion physics: “hot matter” (effects specific to the high temperature medium produced in heavy-ion or nucleus-nucleus collisions) and “cold nu- clear matter” (effects that are present already in proton-nucleus collisions and are a baseline against which hot matter effects must be compared) as well as production of the heavy quarks and quarkonium (bound states of heavy quark-antiquark pairs) in perturbative QCD. The program was structured so that the first two weeks were generally devoted to hot matter, especially lattice QCD. The second half was devoted to issues related to production and cold matter effects. An intense 2.5 day workshop, from 29 September to 1 October. Although a theory program, experimentalists attended throughout, giving talks on recent data and future facilities.
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS↗
Cable Braid Electromagnetic Penetration Model
The model for penetration of a wire braid is rigorously formulated. Integral formulas are developed from energy principles and reciprocity for both self and transfer immittances in terms of potentials for the fields. The detailed boundary value problem for the wire braid is also setup in a very efficient manner; the braid wires act as sources for the potentials in the form of a sequence of line multipoles with unknown coefficients that are determined by means of conditions arising from the wire surface boundary conditions. Approximations are introduced to relate the local properties of the braid wires to a simplified infinite periodic planar geometry. This is used in a simplified application of reciprocity to be able to treat nonuniform coaxial geometries including eccentric interior coaxial arrangements and an exterior ground plane.
42 ENGINEERING↗
Electromagnetic Coupling Into Two Standard Calibration Shields On The Sandia Cable Tester
This report presents analytic transmission line models for calculating the shielding effectiveness of two common calibration standard cables. The two cables have different canonical aperture types, which produce the same low frequency coupling but different responses at resonance. The dominant damping mechanism is produced by the current probe loads at the ends of the cables, which are characterized through adaptor measurements. The model predictions for the cables are compared with experimental measurements and good agreement between the results is demonstrated. This setup constitutes a nice repeatable geometry that nevertheless exhibits some of the challenges involved in modeling non-radio frequency geometries.
42 ENGINEERING↗
Radar Operation in a Hostile Electromagnetic Environment
Radar ISR does not always involve cooperative or even friendly targets. An adversary has numerous techniques available to him to counter the effectiveness of a radar ISR sensor. These generally fall under the banner of jamming, spoofing, or otherwise interfering with the EM signals required by the radar sensor. Consequently mitigation techniques are prudent to retain efficacy of the radar sensor. We discuss in general terms a number of mitigation techniques.
42 ENGINEERING↗
A Data Analysis Center for Electromagnetic and Hadronic Interaction
The GW Data Analysis Center (DAC) has made significant progress in its program to enhance and expand the partial-wave and multipole analyses of fundamental reactions, while maintaining and expanding each associated database. These efforts provide guidance to national and international experimental and theoretical efforts, and are an important link between theory and experiment. Our principal goals are focused on baryon and meson physics programs and related topics.
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS↗
Low-cost Electromagnetic Heating Technology for Polymer Extrusion-based Additive Manufacturing
To improve the flow of materials used in in polymer additive manufacturing, ORNL and Ajax Tocco created an induction system for heating fused deposition modeling (FDM) nozzles used in polymer additive manufacturing. The system is capable of reaching a temperature of 230 C, a typical nozzle temperature for extruding ABS polymers, in 17 seconds. A prototype system was built at ORNL and sent to Ajax Tocco who analyzed the system and created a finalized power supply. The induction system was mounted to a PrintSpace Altair desktop printer and used to create several test parts similar in quality to those created using a resistive heated nozzle.
36 MATERIALS SCIENCE↗