EMPIRE Beam Simulations with Particle Merge
Presents electron density and computational count for some simple electron beams into a background gas with two different merge schemes.
McDoniel, William Joseph↗
Engineering topics
Seidel, David B.
Publications and source records attributed to Seidel, David B..
Improvements to Particle Merge Algorithms for Sandia National Laboratories Plasma Physics Modeling Code, EMPIRE
Explore the source record for details and available documents.
Watrous, Jack↗
EMPHASIS™/Nevada UTDEM User Guide Version 2.1.3
The Unstructured Time-Domain ElectroMagnetics (UTDEM) portion of the EMPHASIS suite solves Maxwell's equations using finite-element techniques on unstructured meshes. This document provides user-specific information to facilitate the use of the code for applications of interest.
42 ENGINEERING↗
SGEMP Algorithm Development and Demonstration for ICEPIC
Algorithms designed to facilitate calculation of gas-modified System-Generated Electromagnetic Pulse (SGEMP) phenomena have been developed for use in ICEPIC. Improvements and extensions of these and related models are considered for helping them be more widely applicable for SGEMP modeling. Confluent Sciences has developed a Buneman-Villasenor unit test tool for assessing particle merge algorithms and has applied that to several candidate algorithms. Statistical analysis of Maxwellian and near-Maxwellian velocity distribution functions has been used to understand limits and tradeoffs of particle merging. Collisional phenomena and plasma models that relieve the burden of a fully kinetic approach have also been developed and assessed.
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSIC↗
EMPHASIS™/Nevada UTDEM User Guide Version 2.1.2
The Unstructured Time-Domain ElectroMagnetics (UTDEM) portion of the EMPHASIS suite solves Maxwell’s equations using finite-element techniques on unstructured meshes. This document provides user-specific information to facilitate the use of the code for applications of interest.
97 MATHEMATICS AND COMPUTING↗
New self-magnetically insulated connection of multilevel accelerators to a common load
Not Available
42 ENGINEERING↗
Requirements for self-magnetically insulated transmission lines
Self-magnetically insulated transmission lines (MITLs) connect pulsed-power drivers with a load. Although the technology was originally developed in the 1970s and is widely used today in super power generators, failure of the technology is the principal limitation on the power that can be delivered to an experiment. We address issues that are often overlooked, rejected after inadequate simulations, or covered by overly conservative assumptions: (i) electron retrapping in coupling MITLs to loads, (ii) the applicability of collisionless versus collisional electron flow, (iii) power transport efficiency as a function of the geometry at the beginning of the MITL, (iv) gap closure and when gap closure can be neglected, and (v) the role of negative ions in causing anode plasmas and enhancing current losses. We suggest a practical set of conservative design requirements for self-magnetically insulated electron flow based on the results discussed in this paper and on previously published results. The requirements are not necessarily severe constraints in all MITL applications; however, each of the 18 suggested requirements should be examined in the design of a MITL and in the investigation of excessive losses.
43 PARTICLE ACCELERATORS↗