Condensed Matter Physics Commons^™

Effects Of Differing Radiation Methods On Charge Transport In Polymers, Zachary Gibson, Jr Dennison, Virginie Griseri

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The mitigation of deleterious arcing and sparking onboard spacecraft depends upon a thorough understanding of the electrical properties of the materials involved. This includes not only understanding steady-state parameters such as dark conductivity, but responses to the space environment as well. For example, radiation-induced conductivity drastically changes the conductivity of a material due to the presence of radiation. However, this change in conductivity diminishes away once the radiation is no longer present. There may also be permanent changes, or aging, in the material properties. The physical processes of aging can be complicated and are often difficult to model. Therefore, empirical …

Analysis Of The Effects Of Surface Modifications And Other Extrinsic Factors On Electron Yield With A “Patch” Model, Matthew Robertson, Christopher Vega, Trace Taylor, Jr Dennison

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Electron yield (EY) is a material attribute of central importance to understanding and modeling spacecraft charging. EY is defined as the ratio of emitted electrons to incident electrons, when irradiated with an electron beam. It depends on incident energy and is unique for each material as determined by its chemical composition, crystal structure, and electronic configurations. Dynamic surface modifications and other extrinsic factors—including surface morphology, composition, contamination, oxidation, and charging— can significantly affect EY and consequently spacecraft charging. This research proposes a “patch” model to provide a simple theoretical framework to model more complex materials comprised of any number of …

Time-Dependent Behavior Of Radiation Induced Conductivity Of Polymers, Tyler Heggenes, Jenny R. Whiteley, Jodie Corbridge Gillespie, Joshua Boman, Jr Dennison

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The conductivity of insulating materials can be enhanced above the baseline dark conductivity by incident radiation via inelastic scattering that imparts energy to electrons in trapped states and excites them into the conduction band, without depositing charge. Such radiation-induced conductivity (RIC), caused by ionizing radiation present in harsh space plasma environments, can play a critical role in space charge dissipation within highly insulating materials used in spacecraft. An equilibrium value for RIC, 𝜎_RIC, is attained after prolonged exposure to an incident dose rate; this follows a standard theoretical power law model proposed by Rose/Fowler/Vissenberg, 𝜎_RIC(T …

Rectifying Garbage-In Equals Garbage-Out Using A Secondary Electron Yield Materials Database, Phil Lundgreen, Jr Dennison

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No abstract provided.

Optical Transmission Of Irradiated Optical Filters, Jr Dennison, Ashlan Keeler, Brian Wood, Jonh Mojica Decena

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No abstract provided.

Characterization Of Electron Yield Suppression With Carbon Nanotube Forest Grown On Silicon Substrates, Brian Wood, Jordan Lee, Justin Christensen, Gregory Wilson, Jr Dennison, T. -C. Shen

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No abstract provided.

Simulating Microgravity And Space Radiation With A Rotary Cell Culture System (Rccs), Alexandra Nelson, Lori Caldwell, Eryn Hanson, Jr Dennison, Elizabeth Vargis

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No abstract provided.

Characterization Of Electron Yield Suppression With Carbon Nanotube Forest Grown On Silicon Substrates, Brian Wood, Jordan Lee, Gregory Wilson, Jr Dennison, T. -C. Shen

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No abstract provided.

Electron Yield Measurements Of Multilayer Conductive Materials, Gregory Wilson, Matthew Robertson, Jordan Lee, Jr Dennison

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No abstract provided.

Electron Yield Measurements Of Multilayer Conductive Materials, Gregory Wilson, Matthew Robertson, Jordan Lee, Jr Dennison

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No abstract provided.

Detection And Classification Of High Energy Beta Radiation Induced Damage Of Raspberry Pi Zero Intended For Opal Cubesat, Jonh Mojica Decena, Jr Dennison, Brian Wood, Ryan J. Martineau, Michael Taylor

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No abstract provided.

Simulating Microgravity And Space Radiation With A Rotary Cell Culture System (Rccs), Alexandra Nelson, Lori Caldwell, Eryn Hanson, Jr Dennison, Elizabeth Vargis

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No abstract provided.

Real-Time Video Processing Of Arcing Events To Determine Coincidence, Jr Dennison, Gregory Wilson, Jonh Mojica Decena, Brian Wood

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No abstract provided.

Charging Effects Of High Voltage Probe Pulse On Pulsed Electroacoustic Measurements, Zachary Gibson, Jr Dennison, Lee Pearson, Erick Griffiths, Anthony Pearson

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No abstract provided.

Charging Effects Of High Voltage Probe Pulse On Pulsed Electroacoustic Measurements, Zachary Gibson, Jr Dennison, Erick W. Griffiths, Lee Pearson, Anthony Pearson

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No abstract provided.

Characterizing Vibrationally Induced Damage Of Carbon Nanotube Forests, Jordan Lee, Brian Wood, Ashlan Keeler, Jr Dennison, T. -C. Shen

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No abstract provided.

Electron Yield Of A Carbon-Composite Nanodielectric, Jr Dennison, Matthew Robertson, Gregory Wilson, Justin Christensen

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No abstract provided.

Detection And Classification Of High Energy Beta Radiation Induced Damage Of Raspberry Pi Zero Intended For Opal Cubesat, Jonh Mojica Decena, Ryan J. Martineau, Jr Dennison, Brian Wood, Michael J. Taylor

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No abstract provided.

Electron Yield Of Carbon-Composite Nanodielectric, Matthew Robertson, Justin Christensen, Gregory Wilson, Jr Dennison

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No abstract provided.

Optical Transmission Of Irradiated Optical Filters, Ashlan Keeler, Jr Dennison, Brian Wood, Jonh Mojica Decena

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No abstract provided.

Characterizing Vibrationally Induced Damage Of Carbon Nanotube Forests, Jordan Lee, Brian Wood, Ashlan Keeler, Jr Dennison, T. -C. Shen

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No abstract provided.

Long-Term Stability Of Ion-Beam Treated Space Polymers In Geo-Simulated Environment, J Kleiman, Z Iskanderova, L Krishtein, Jr Dennison, Brian Wood, C Best

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No abstract provided.

Long-Term Stability Of Ion-Beam Treated Space Polymers In Geo-Simulated Environment, J Kleiman, Z Iskanderova, C Best, Jr Dennison, Brian Wood

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It is a real challenge to reproduce various space environment conditions in ground-based facilities for testing of external space system materials and elements. This is due to the variety and complexity of the space environment conditions and their effects on materials and structures. The reliability of test results depends on accurate simulation of the critical factors and effects of the space environment for a particular mission. The main objectives of the simulation testing are to get the test results that are adequate to the material durability and functional behavior in a space environment.

As part of a large, multi-year program, …

Space Environment Effects: Payoffs Of Unsgc Research Infrastructure Awards, Jr Dennison, Elizabeth Vargis

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No abstract provided.

The Effects Of Beta Transition On Dielectric Breakdown In Ldpe, Tyler Kippen, Allen Andersen, Jr Dennison

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No abstract provided.

Characterizing The Effects Of Radiation On Muscle Cells, Lori Caldwell, Charles Harding, Eryn Hanson, Jr Dennison, Elizabeth Vargis

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No abstract provided.

Time-Evolved Constant Voltage Conductivity Measurements Of Common Spaceborne Polymeric Materials, Brian Wood, David King, Jr Dennison

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No abstract provided.

Electron Yield Properties Of Low-Density Polyethylene, Jordan Lee, Jr Dennison

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No abstract provided.

Electron Yield Of Low-Density Polyethylene, Jordan Lee, Jr Dennison

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No abstract provided.

Simulating Muscle Atrophy Due To Microgravity And Ionizing Radiation, Lori Caldwell, Eryn Hanson, Alexandra H. Nelson, Charles Harding, Jr Dennison, Elizabeth Vargis

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No abstract provided.