Mark Hess
YOU?
Author Swipe
View article: Nonlocal, diamagnetic electromagnetic effects in magnetically insulated transmission lines
Nonlocal, diamagnetic electromagnetic effects in magnetically insulated transmission lines Open
We identify the time-dependent physics responsible for the critical reduction of current losses in magnetically insulated transmission lines (MITLs) due to uninsulated space charge-limited currents of electrons emitted by field stress. A d…
View article: Non-local, diamagnetic electromagnetic effects in magnetically insulated transmission lines
Non-local, diamagnetic electromagnetic effects in magnetically insulated transmission lines Open
We identify the time-dependent physics responsible for the critical reduction of current losses in magnetically insulated transmission lines (MITLs) due to uninsulated space charge limited (SCL) currents of electrons emitted by field stres…
View article: Characterization of power delivery and losses in a long coaxial inner MITL
Characterization of power delivery and losses in a long coaxial inner MITL Open
The long coaxial inner magnetically insulated transmission line (MITL) is considered as a possible transmission line to guide power to deep underground high yield fusion experiments. The considered dimensions are of order 10-15 meters in l…
View article: Achieving Higher Fidelity Pulsed-Power Simulations Using Advanced Gap Closure Modeling
Achieving Higher Fidelity Pulsed-Power Simulations Using Advanced Gap Closure Modeling Open
This project has progressed several physics models in the EMPIRE plasma simulation code to achieve higher fidelity simulations of high-current diode operation in pulsed-power accelerators. In this report, we present details for the followi…
View article: MRT 7365 Power flow physics and key physics phenomena: EMPIRE verification suite
MRT 7365 Power flow physics and key physics phenomena: EMPIRE verification suite Open
This milestone work baselines electromagnetic particle-in-cell capability of the EMPIRE plasma simulation code to model key processes germane to the physics of electrode plasmas arising in magnetically-insulated transmission lines operatin…
View article: MRT 7365: Power flow physics and key physics phenomena
MRT 7365: Power flow physics and key physics phenomena Open
The Z accelerator at Sandia National Laboratories conducts z-pinch experiments at 26 MA in support of DOE missions in stockpile stewardship, dynamic materials, fusion, and other basic sciences. Increasing the current delivered to the z-pin…
View article: Efficient kinetic particle simulations of space charge limited emission in magnetically insulated transmission lines using reduced physics models
Efficient kinetic particle simulations of space charge limited emission in magnetically insulated transmission lines using reduced physics models Open
We explore the use of reduced physics models for efficient kinetic particle simulations of space charge limited (SCL) emission in inner magnetically insulated transmission lines (inner MITLs), with application to Sandia National Laboratori…
View article: Spatially resolved measurements of load current delivery on a 14 MA, 100 ns pulsed power experiment using a line-imaging velocity interferometer
Spatially resolved measurements of load current delivery on a 14 MA, 100 ns pulsed power experiment using a line-imaging velocity interferometer Open
Pulsed power generators create high-energy-density conditions by rapidly delivering an immense pulse of electrical current to a compact imploding load. Accurately measuring the shape and amplitude of this load current pulse is essential to…
View article: Efficient approach to kinetic simulation in the inner magnetically insulated transmission line on Z
Efficient approach to kinetic simulation in the inner magnetically insulated transmission line on Z Open
This project explores the idea of performing kinetic numerical simulations in the Z inner magnetically insulated transmission line (inner MITL) by reduced physics models such as a guiding center drift kinetic approximation for particles an…
View article: Electron Dynamics Within a MITL Containing a Load
Electron Dynamics Within a MITL Containing a Load Open
In this paper, we derive the vacuum electric fields within specific cylindrically symmetric magnetically insulated transmission lines (MITLs) in the limit of an infinite speed of light for an arbitrary time-dependent current. We focus our …
View article: Full Kinetic and Drift Kinetic Descriptions of Electron Within MITLs Near a Load.
Full Kinetic and Drift Kinetic Descriptions of Electron Within MITLs Near a Load. Open
drive. Using guiding center theory, however, one can describe the gross particle kinetics using a combination of $$\textbf {E} \times \textbf {B}$$ and $$\nabla B$$ drifts. In addition, we compare our approximate inner MITL field models an…
View article: Full Kinetic and Drift Kinetic Descriptions of Electrons Within MITLs Near a Load.
Full Kinetic and Drift Kinetic Descriptions of Electrons Within MITLs Near a Load. Open
drive. Using guiding center theory, however, one can describe the gross particle kinetics using a combination of $$\textbf {E} \times \textbf {B}$$ and $$\nabla B$$ drifts. In addition, we compare our approximate inner MITL field models an…
View article: Effects of Radiation Reaction Physics on High-Current Power Flow
Effects of Radiation Reaction Physics on High-Current Power Flow Open
In this study, we examine the effects of the radiation reaction force on electrons in a radial magnetically insulated transmission line (MITL) near a load with peak currents of 60+ MA. More specifically, we study the differences in electro…
View article: Electron Dynamics Within a Magnetically Insulated Transmission Line Containing a Load.
Electron Dynamics Within a Magnetically Insulated Transmission Line Containing a Load. Open
requires different protection because the transmission line debris shield should not significantly raise the inductance or perturb the self- magnetically insulated electron flow. This report shows calculations and results from a design int…
View article: Fields and particle dynamics in the vicinity of a MITL load.
Fields and particle dynamics in the vicinity of a MITL load. Open
in monitoring for such particles. The viability and performance of several types and configurations of radiation detectors will be described, along with methods by which particles might be detected, given their response to buried particles…
View article: Review of pulsed power-driven high energy density physics research on Z at Sandia
Review of pulsed power-driven high energy density physics research on Z at Sandia Open
Pulsed power accelerators compress electrical energy in space and time to provide versatile experimental platforms for high energy density and inertial confinement fusion science. The 80-TW “Z” pulsed power facility at Sandia National Labo…
View article: Transmission-line-circuit model of an 85-TW, 25-MA pulsed-power accelerator
Transmission-line-circuit model of an 85-TW, 25-MA pulsed-power accelerator Open
Here, we have developed a physics-based transmission-line-circuit model of the Z pulsed-power accelerator. The 33-m-diameter Z machine generates a peak electrical power as high as 85 TW, and delivers as much as 25 MA to a physics load. The…
View article: Detection of an anomalous pressure on a magneto-inertial-fusion load current diagnostic
Detection of an anomalous pressure on a magneto-inertial-fusion load current diagnostic Open
Recent Magnetized Liner Inertial Fusion experiments at the Sandia National Laboratories Z pulsed power facility have featured a PDV (Photonic Doppler Velocimetry) diagnostic in the final power feed section for measuring load current. In th…