Hermann Geppert-Kleinrath
YOU?
Author Swipe
View article: Simple analytic fusion hot spot models for fusion reaction history
Simple analytic fusion hot spot models for fusion reaction history Open
The measured fusion reaction history is a combination of the temporal evolution of the fusion hot spot temperature, mass, and volume. Depending on the mechanism of evolution in inertial confinement fusion implosions—shocks, compression, co…
View article: First indirectly driven liquid-DT filled double shell implosions at the National Ignition Facility
First indirectly driven liquid-DT filled double shell implosions at the National Ignition Facility Open
Double shell implosions aim to explore material mixing under fusion conditions in a volume burn geometry using high-Z metal pushers. High-Z pushers are more compressible than low-Z pushers enabling high stagnation pressure which reduces th…
View article: Quantifying fission yields at the National Ignition Facility using depleted uranium foil experiments
Quantifying fission yields at the National Ignition Facility using depleted uranium foil experiments Open
There are programs for high-Z shell experiments at the National Ignition Facility (NIF). For shells made of actinide material, a quantitative fission diagnostic is needed in order to determine how much fission took place and whether the fi…
View article: Reaction-in-flight neutrons as a diagnostic for hydrodynamical mixing in double shell inertial confinement fusion capsules
Reaction-in-flight neutrons as a diagnostic for hydrodynamical mixing in double shell inertial confinement fusion capsules Open
We examine reaction-in-flight (RIF) neutrons as diagnostics for hydrodynamical mixing of high-Z shell material into the hotspot of double shell capsules that are designed for the National Ignition Facility. In particular, we consider the e…
View article: Ultra-fast single-crystal CVD diamonds in the particle time-of-flight (PTOF) detector for low yield burn-history measurements on the NIF (invited)
Ultra-fast single-crystal CVD diamonds in the particle time-of-flight (PTOF) detector for low yield burn-history measurements on the NIF (invited) Open
The Particle Time of Flight (PTOF) diagnostic is a chemical vapor deposition diamond-based detector and is the only diagnostic for measuring nuclear bang times of low yield (<1013) shots on the National Ignition Facility. Recently, a co…
View article: Present understanding of ignition and gain using indirect-drive inertial confinement fusion target designs on the U.S. National Ignition Facility
Present understanding of ignition and gain using indirect-drive inertial confinement fusion target designs on the U.S. National Ignition Facility Open
For many decades, the running joke in fusion research has been that ‘fusion’ is thirty years away and always will be. Yet, these past few years we find ourselves in a position where we can now talk about the milestones of burning plasmas, …
View article: A novel high frequency, high bandwidth, three phase Mach–Zehnder optical data link
A novel high frequency, high bandwidth, three phase Mach–Zehnder optical data link Open
In inertial confinement fusion, hydrogen isotopes are fused together under high pressures and temperatures. Typically, the duration of these experiments is incredibly short, on the order of around 60–150 ps. Due to the high radiation envir…
View article: Inferring fusion nuclear burnwidths with low gain photomultiplier impulse response functions
Inferring fusion nuclear burnwidths with low gain photomultiplier impulse response functions Open
When an inertial confinement fusion implosion is compressed, it maintains thermonuclear density and temperatures for a very short time scale, about 100 ps. The Gamma Reaction History diagnostic measures the time evolution of the fusion bur…
View article: Separated reactant mix width across diffusion-dominated and hydrodynamically dominated interface mix in inertial confinement fusion implosions
Separated reactant mix width across diffusion-dominated and hydrodynamically dominated interface mix in inertial confinement fusion implosions Open
Diffusion-dominated mix in inertial confinement fusion (ICF) is characterized where the majority of the mix occurs in the immediate fuel-shell interface while hydrodynamic-dominated mix pulls shell material from farther away into the centr…
View article: Thermonuclear performance variability near ignition at the National Ignition Facility
Thermonuclear performance variability near ignition at the National Ignition Facility Open
We describe our current understanding of the variability and degradation mechanisms observed through a series of five indirectly driven inertial fusion implosions fielded at the National Ignition Facility in the fall of 2021, four of which…
View article: Learning from each other: Cross-cutting diagnostic development activities between magnetic and inertial confinement fusion (invited)
Learning from each other: Cross-cutting diagnostic development activities between magnetic and inertial confinement fusion (invited) Open
Inertial Confinement Fusion and Magnetic Confinement Fusion (ICF and MCF) follow different paths toward goals that are largely common. In this paper, the claim is made that progress can be accelerated by learning from each other across the…
View article: NucD-25 Nuclear Diagnostics Development: NIS capability, Maximizing gamma ray dynamic range, (n,γ) measurements for carbon ρR [Slides]
NucD-25 Nuclear Diagnostics Development: NIS capability, Maximizing gamma ray dynamic range, (n,γ) measurements for carbon ρR [Slides] Open
The LANL Neutron Imaging team is preparing for NIS upgrades and novel capabilities with the advent of consistently higher yields at NIF. Novel scintillators, solid-state detectors, multiplexed imaging detectors, upgraded data acquisition s…
View article: Optimization of the gamma reaction history diagnostic for double-shell pusher areal density and reaction history measurements on the National Ignition Facility
Optimization of the gamma reaction history diagnostic for double-shell pusher areal density and reaction history measurements on the National Ignition Facility Open
The double-shell inertial confinement fusion campaign, which consists of an aluminum ablator, a foam cushion, a high-Z pusher (tungsten or molybdenum), and liquid deuterium–tritium (DT) fuel, aims for its first DT filled implosions on the …
View article: Observations and properties of the first laboratory fusion experiment to exceed a target gain of unity
Observations and properties of the first laboratory fusion experiment to exceed a target gain of unity Open
An indirect-drive inertial fusion experiment on the National Ignition Facility was driven using 2.05 MJ of laser light at a wavelength of 351 nm and produced 3.1±0.16 MJ of total fusion yield, producing a target gain G=1.5±0.1 exceeding un…
View article: The impact of low-mode symmetry on inertial fusion energy output in the burning plasma state
The impact of low-mode symmetry on inertial fusion energy output in the burning plasma state Open
Indirect Drive Inertial Confinement Fusion Experiments on the National Ignition Facility (NIF) have achieved a burning plasma state with neutron yields exceeding 170 kJ 1, 2 , roughly 3 times the prior record and a necessary stage for igni…
View article: LANL diagnostics at NIF [Slides]
LANL diagnostics at NIF [Slides] Open
Nuclear Diagnostics are described at the National Ignition Facility (NIF) including Reaction History and Neutron Imaging.
View article: First large capsule implosions in a frustum-shaped <i>hohlraum</i>
First large capsule implosions in a frustum-shaped <i>hohlraum</i> Open
We report on the first indirect-drive implosions driven by a dual conical frustum-shaped hohlraum denoted “frustraum” and the experimental tuning campaigns leading up to two layered implosions. The campaign used 1.2 and 1.4 mm inner radius…
View article: Dynamics and Power Balance of Near Unity Target Gain Inertial Confinement Fusion Implosions
Dynamics and Power Balance of Near Unity Target Gain Inertial Confinement Fusion Implosions Open
The change in the power balance, temporal dynamics, emission weighted size, temperature, mass, and areal density of inertially confined fusion plasmas have been quantified for experiments that reach target gains up to 0.72. It is observed …
View article: Measurements of fusion reaction history in inertially confined burning plasmas
Measurements of fusion reaction history in inertially confined burning plasmas Open
Direct evidence of inertially confined fusion ignition appears in the abrupt temperature increase and consequent rapid increase in the thermonuclear burn rate as seen in the reaction history. The Gamma Reaction History (GRH) and Gas Cheren…
View article: NucD-24 Nuclear Diagnostics Development: Time resolved <sup>12</sup>C-rhoR on GCD and NIS technology development for polar LOS and data quality [Slides]
NucD-24 Nuclear Diagnostics Development: Time resolved <sup>12</sup>C-rhoR on GCD and NIS technology development for polar LOS and data quality [Slides] Open
The Neutron Imaging team is readying for the NIS2 polar LOS development and future improvements to data quality on all LOS given consistently higher yields at NIF. Next-gen nano guide scintillators for NIS2 and CMOS cameras to replace outd…