Patrick Knapp
YOU?
Author Swipe
View article: Opportunities in pulsed magnetic fusion energy
Opportunities in pulsed magnetic fusion energy Open
Fusion is a potentially transformational energy technology, which promises limitless clean energy. Yet, it requires continued scientific and technological development to realize its potential. The conditions necessary for fusion energy gai…
View article: Affordable, manageable, practical, and scalable (AMPS) high-yield and high-gain inertial fusion
Affordable, manageable, practical, and scalable (AMPS) high-yield and high-gain inertial fusion Open
High-yield inertial fusion offers a transformative path to affordable, clean, firm power and advanced defense capabilities. Recent milestones at large facilities, particularly the National Ignition Facility (NIF), have demonstrated the fea…
View article: Validation of FLASH for magnetically driven inertial confinement fusion target design
Validation of FLASH for magnetically driven inertial confinement fusion target design Open
FLASH is a widely available radiation magnetohydrodynamics code used for astrophysics, laboratory plasma science, high energy density physics, and inertial confinement fusion (ICF). Increasing interest in magnetically driven inertial confi…
View article: Affordable, manageable, practical, and scalable (AMPS) high-yield and high-gain inertial fusion
Affordable, manageable, practical, and scalable (AMPS) high-yield and high-gain inertial fusion Open
High-yield inertial fusion offers a transformative path to affordable clean firm power and advanced defense capabilities. Recent milestones at large facilities, particularly the National Ignition Facility (NIF), have demonstrated the feasi…
View article: Validation of FLASH for magnetically driven inertial confinement fusion target design
Validation of FLASH for magnetically driven inertial confinement fusion target design Open
FLASH is a widely available radiation magnetohydrodynamics code used for astrophysics, laboratory plasma science, high energy density physics, and inertial confinement fusion. Increasing interest in magnetically driven inertial confinement…
View article: Charged-particle transport in high energy density plasmas
Charged-particle transport in high energy density plasmas Open
This Special Topic Collection grew out of two gatherings of researchers active in the high energy density (HED) physics community: a mini-conference on charged-particle transport in HED plasma held during the 64th annual meeting of the Ame…
View article: Opportunities in Pulsed Magnetic Fusion Energy
Opportunities in Pulsed Magnetic Fusion Energy Open
Fusion is a potentially transformational energy technology, which promises limitless clean energy. Yet, it requires continued scientific and technological development to realize its potential. The conditions necessary for fusion energy gai…
View article: Mining experimental magnetized liner inertial fusion data: Trends in stagnation morphology
Mining experimental magnetized liner inertial fusion data: Trends in stagnation morphology Open
In magnetized liner inertial fusion (MagLIF), a cylindrical liner filled with fusion fuel is imploded with the goal of producing a one-dimensional plasma column at thermonuclear conditions. However, structures attributed to three-dimension…
View article: Development of a high performance MagLIF target platform using high aspect ratio coated liners and low-mix laser preheat
Development of a high performance MagLIF target platform using high aspect ratio coated liners and low-mix laser preheat Open
We report on a series of Magnetized Liner Inertial Fusion (MagLIF) experiments conducted on the Z pulsed power facility that utilized high aspect ratio (ratio of outer radius to wall thickness) liners with dielectric coatings and low-mix l…
View article: Opportunities in Pulsed Magnetic Fusion Energy
Opportunities in Pulsed Magnetic Fusion Energy Open
Fusion is a potentially transformational energy technology, which promises limitless clean energy. Yet, it requires continued scientific and technological development to realize its potential. The conditions necessary for fusion energy gai…
View article: Review of the second charged-particle transport coefficient code comparison workshop
Review of the second charged-particle transport coefficient code comparison workshop Open
We report the results of the second charged-particle transport coefficient code comparison workshop, which was held in Livermore, California on 24–27 July 2023. This workshop gathered theoretical, computational, and experimental scientists…
View article: Controlling morphology and improving reproducibility of magnetized liner inertial fusion experiments
Controlling morphology and improving reproducibility of magnetized liner inertial fusion experiments Open
X-ray imaging indicates magnetized liner inertial fusion (MagLIF) stagnation columns have a complicated quasi-helical structure with significant variations in x-ray brightness along the column. In this work, we describe MagLIF experiments …
View article: Developing and applying quantifiable metrics for diagnostic and experiment design on Z
Developing and applying quantifiable metrics for diagnostic and experiment design on Z Open
This project applies methods in Bayesian inference and modern statistical methods to quantify the value of new experimental data, in the form of new or modified diagnostic configurations and/or experiment designs. We demonstrate experiment…
View article: X-ray self-emission imaging with spherically bent Bragg crystals on the Z-machine
X-ray self-emission imaging with spherically bent Bragg crystals on the Z-machine Open
An x-ray imaging scheme using spherically bent crystals was implemented on the Z-machine to image x rays emitted by the hot, dense plasma generated by a Magnetized Liner Inertial Fusion (MagLIF) target. This diagnostic relies on a spherica…
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: Advanced data analysis in inertial confinement fusion and high energy density physics
Advanced data analysis in inertial confinement fusion and high energy density physics Open
Bayesian analysis enables flexible and rigorous definition of statistical model assumptions with well-characterized propagation of uncertainties and resulting inferences for single-shot, repeated, or even cross-platform data. This approach…
View article: Demonstration of improved laser preheat with a cryogenically cooled magnetized liner inertial fusion platform
Demonstration of improved laser preheat with a cryogenically cooled magnetized liner inertial fusion platform Open
We report on progress implementing and testing cryogenically cooled platforms for Magnetized Liner Inertial Fusion (MagLIF) experiments. Two cryogenically cooled experimental platforms were developed: an integrated platform fielded on the …
View article: Data-driven assessment of magnetic charged particle confinement parameter scaling in magnetized liner inertial fusion experiments on Z
Data-driven assessment of magnetic charged particle confinement parameter scaling in magnetized liner inertial fusion experiments on Z Open
In magneto-inertial fusion, the ratio of the characteristic fuel length perpendicular to the applied magnetic field R to the α-particle Larmor radius ϱα is a critical parameter setting the scale of electron thermal-conduction loss and char…
View article: A framework for experimental-data-driven assessment of Magnetized Liner Inertial Fusion stagnation image metrics
A framework for experimental-data-driven assessment of Magnetized Liner Inertial Fusion stagnation image metrics Open
A variety of spherical crystal x-ray imager (SCXI) diagnostics have been developed and fielded on Magnetized Liner Inertial Fusion (MagLIF) experiments at the Sandia National Laboratories Z-facility. These different imaging modalities prov…
View article: Exploring the parameter space of MagLIF implosions using similarity scaling. II. Current scaling
Exploring the parameter space of MagLIF implosions using similarity scaling. II. Current scaling Open
Magnetized liner inertial fusion (MagLIF) is a magneto-inertial-fusion (MIF) concept, which is presently being studied on the Z pulsed power facility. The MagLIF platform has achieved interesting plasma conditions at stagnation and produce…
View article: Optimizing the configuration of plasma radiation detectors in the presence of uncertain instrument response and inadequate physics
Optimizing the configuration of plasma radiation detectors in the presence of uncertain instrument response and inadequate physics Open
We present a general method for optimizing the configuration of an experimental diagnostic to minimize uncertainty and bias in inferred quantities from experimental data. The method relies on Bayesian inference to sample the posterior usin…
View article: Statistical characterization of experimental magnetized liner inertial fusion stagnation images using deep-learning-based fuel–background segmentation
Statistical characterization of experimental magnetized liner inertial fusion stagnation images using deep-learning-based fuel–background segmentation Open
Significant variety is observed in spherical crystal x-ray imager (SCXI) data for the stagnated fuel–liner system created in Magnetized Liner Inertial Fusion (MagLIF) experiments conducted at the Sandia National Laboratories Z-facility. As…