Jonathan Carroll-Nellenback
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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: 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: Terrestrial atmospheric ion implantation occurred in the nearside lunar regolith during the history of Earth's dynamo
Terrestrial atmospheric ion implantation occurred in the nearside lunar regolith during the history of Earth's dynamo Open
Light volatile elements in lunar regolith are thought to be a mixture of the solar wind and Earth's atmosphere, the latter sourced in the absence of geomagnetic field. However, the extent to which both the current and primitive geodynamo i…
View article: Cooling and instabilities in colliding radiative flows with toroidal magnetic fields
Cooling and instabilities in colliding radiative flows with toroidal magnetic fields Open
We report on the results of a simulation-based study of colliding magnetized plasma flows. Our set-up mimics pulsed power laboratory astrophysical experiments but, with an appropriate frame change, is relevant to astrophysical jets with in…
View article: Demonstration of hot-spot fuel gain exceeding unity in direct-drive inertial confinement fusion implosions
Demonstration of hot-spot fuel gain exceeding unity in direct-drive inertial confinement fusion implosions Open
View article: How negative feedback and the ambient environment limit the influence of recombination in common envelope evolution
How negative feedback and the ambient environment limit the influence of recombination in common envelope evolution Open
We perform 3D hydrodynamical simulations to study recombination and ionization during the common envelope (CE) phase of binary evolution, and develop techniques to track the ionic transitions in time and space. We simulate the interaction …
View article: Cooling and Instabilities in Colliding Radiative Flows with Toroidal Magnetic Fields
Cooling and Instabilities in Colliding Radiative Flows with Toroidal Magnetic Fields Open
We report on the results of a simulation based study of colliding magnetized plasma flows. Our set-up mimics pulsed power laboratory astrophysical experiments but, with an appropriate frame change, are relevant to astrophysical jets with i…
View article: Semantic Information in a Model of Resource Gathering Agents
Semantic Information in a Model of Resource Gathering Agents Open
In this study, resource foraging is analyzed using the framework of ``Semantic Information theory'' predicting a sharp transition in the forager's expected lifetime as correlations with the environment are scrambled.
View article: How negative feedback and the ambient environment limit the influence of recombination in common envelope evolution
How negative feedback and the ambient environment limit the influence of recombination in common envelope evolution Open
We perform 3D hydrodynamical simulations to study recombination and ionization during the common envelope (CE) phase of binary evolution, and develop techniques to track the ionic transitions in time and space. We simulate the interaction …
View article: Semantic Information in a model of Resource Gathering Agents
Semantic Information in a model of Resource Gathering Agents Open
We explore the application of a new theory of Semantic Information to the well-motivated problem of a resource foraging agent. Semantic information is defined as the subset of correlations, measured via the transfer entropy, between agent …
View article: Understanding the fusion yield dependencies in OMEGA DT-layered implosion experiments using a physics-based statistical mapping model
Understanding the fusion yield dependencies in OMEGA DT-layered implosion experiments using a physics-based statistical mapping model Open
Improving the performance of inertial confinement fusion implosions requires physics models that can accurately predict the response to changes in the experimental inputs. Good predictive capability has been demonstrated for the fusion yie…
View article: Perpendicular Subcritical Shock Structure in a Collisional Plasma Experiment
Perpendicular Subcritical Shock Structure in a Collisional Plasma Experiment Open
We present a study of perpendicular subcritical shocks in a collisional laboratory plasma. Shocks are produced by placing obstacles into the supermagnetosonic outflow from an inverse wire array z pinch. We demonstrate the existence of subc…
View article: Morphology of shocked lateral outflows in colliding hydrodynamic flows
Morphology of shocked lateral outflows in colliding hydrodynamic flows Open
Supersonic interacting flows occurring in phenomena, such as protostellar jets, give rise to strong shocks and have been demonstrated in several laboratory experiments. To study such colliding flows, we use the AstroBEAR AMR code to conduc…
View article: The Consensus Problem in Polities of Agents with Dissimilar Cognitive Architectures
The Consensus Problem in Polities of Agents with Dissimilar Cognitive Architectures Open
Agents interacting with their environments, machine or otherwise, arrive at decisions based on their incomplete access to data and their particular cognitive architecture, including data sampling frequency and memory storage limitations. I…
View article: Opportunities for Technosignature Science in the Planetary Science and Astrobiology Decadal Survey
Opportunities for Technosignature Science in the Planetary Science and Astrobiology Decadal Survey Open
Solar system exploration provides numerous possibilities for advancing technosignature science. The search for life in the solar system includes missions designed to search for evidence of biosignatures on other planetary bodies, but many …
View article: Jets from main sequence and white dwarf companions during common envelope evolution
Jets from main sequence and white dwarf companions during common envelope evolution Open
It has long been speculated that jet feedback from accretion on to the companion during a common envelope (CE) event could affect the orbital evolution and envelope unbinding process. We present global 3D hydrodynamical simulations of CE e…
View article: The formation of discs in the interior of AGB stars from the tidal disruption of planets and brown dwarfs
The formation of discs in the interior of AGB stars from the tidal disruption of planets and brown dwarfs Open
A significant fraction of isolated white dwarfs host magnetic fields in excess of a MegaGauss. Observations suggest that these fields originate in interacting binary systems where the companion is destroyed thus leaving a singular, highly …
View article: Perpendicular subcritical shock structure in a collisional plasma experiment
Perpendicular subcritical shock structure in a collisional plasma experiment Open
We present a study of perpendicular subcritical shocks in a collisional laboratory plasma. Shocks are produced by placing obstacles into the super-magnetosonic outflow from an inverse wire array z-pinch. We demonstrate the existence of sub…
View article: Effects of charge exchange on the evaporative wind of HD 209458b
Effects of charge exchange on the evaporative wind of HD 209458b Open
The role of charge exchange in shaping exoplanet photoevaporation remains a topic of contention. Exchange of electrons between stellar wind protons from the exoplanet’s host star and neutral hydrogen from the planet’s wind has been propose…
View article: Consensus between Epistemic Agents is Difficult
Consensus between Epistemic Agents is Difficult Open
We introduce an epistemic information measure between two data streams, that we term $influence$. Closely related to transfer entropy, the measure must be estimated by epistemic agents with finite memory resources via sampling accessible d…
View article: Asteroid magnetization from the early solar wind
Asteroid magnetization from the early solar wind Open
Magnetic fields provide an important probe of the thermal, material, and structural history of planetary and sub-planetary bodies. Core dynamos are a potential source of magnetic fields for differentiated bodies, but evidence of magnetizat…
View article: Triggering a Climate Change Dominated “Anthropocene”: Is It Common among Exocivilizations?
Triggering a Climate Change Dominated “Anthropocene”: Is It Common among Exocivilizations? Open
We seek to model the coupled evolution of a civilization and its host planet through the era when energy harvesting by the civilization drives the planet into new and adverse climate states. In this way, we ask if triggering “Anthropocenes…
View article: Cooling and instabilities in colliding flows
Cooling and instabilities in colliding flows Open
Collisional self-interactions occurring in protostellar jets give rise to strong shocks, the structure of which can be affected by radiative cooling within the flow. To study such colliding flows, we use the AstroBEAR AMR code to conduct h…
View article: Density evolution after shock release from laser-driven polystyrene (CH) targets in inertial confinement fusion
Density evolution after shock release from laser-driven polystyrene (CH) targets in inertial confinement fusion Open
The evolution of the plasma density in the rarefaction wave formed after a laser-driven shock is released from a CH foil was measured using optical interferometry. It was found that the plasma density profile is very sensitive to the condi…
View article: Experimentally Inferred Fusion Yield Dependencies of OMEGA Inertial Confinement Fusion Implosions
Experimentally Inferred Fusion Yield Dependencies of OMEGA Inertial Confinement Fusion Implosions Open
Statistical modeling of experimental and simulation databases has enabled the development of an accurate predictive capability for deuterium-tritium layered cryogenic implosions at the OMEGA laser [V. Gopalaswamy et al.,Nature 565, 581 (20…
View article: The Dynamics of the Transition from Kardashev Type II to Type III Galaxies Favor Technosignature Searches in the Central Regions of Galaxies
The Dynamics of the Transition from Kardashev Type II to Type III Galaxies Favor Technosignature Searches in the Central Regions of Galaxies Open
We present a video of a simulation showing the expansion front of a technological species settling a Milky Way-like galaxy, created using the model described in Carroll-Nellenback et al. It illustrates how even very conservative rates of s…
View article: Arrival and magnetization of carbonaceous chondrites in the asteroid belt before 4562 million years ago
Arrival and magnetization of carbonaceous chondrites in the asteroid belt before 4562 million years ago Open
Meteorite magnetizations can provide rare insight into early Solar System evolution. Such data take on new importance with recognition of the isotopic dichotomy between non-carbonaceous and carbonaceous meteorites, representing distinct in…
View article: Bipolar planetary nebulae from outflow collimation by common envelope evolution
Bipolar planetary nebulae from outflow collimation by common envelope evolution Open
The morphology of bipolar planetary nebulae (PNe) can be attributed to interactions between a fast wind from the central engine and the dense toroidal-shaped ejecta left over from common envelope (CE) evolution. Here we use the 3D hydrodyn…
View article: Implementing a microphysics model in hydrodynamic simulations to study the initial plasma formation in dielectric ablator materials for direct-drive implosions
Implementing a microphysics model in hydrodynamic simulations to study the initial plasma formation in dielectric ablator materials for direct-drive implosions Open
A microphysics model to describe the photoionization and impact ionization processes in dielectric ablator materials like plastic has been implemented into the one-dimensional hydrodynamic code LILAC for planar and spherical targets. At pr…
View article: Common envelope evolution on the asymptotic giant branch: unbinding within a decade?
Common envelope evolution on the asymptotic giant branch: unbinding within a decade? Open
Common envelope (CE) evolution is a critical but still poorly understood progenitor phase of many high-energy astrophysical phenomena. Although 3D global hydrodynamic CE simulations have become more common in recent years, those involving …