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Full-Text Articles in Physics
Space Impact Ejecta Model Of Micrometeoroid Collision On Misse-6, Kelby T. Peterson, Jr Dennison
Space Impact Ejecta Model Of Micrometeoroid Collision On Misse-6, Kelby T. Peterson, Jr Dennison
Presentations
The Utah State University SUSpECS project was a unique student experiment that allowed for pre- and post-flight analysis of various materials used in space-component design. Approximately 180 material samples were flown on MISSE-6 and spent 18 months suspended off the side of the International Space Station, which were returned in pristine condition. This presentation focuses on the most intriguing sample, a thin film of polyethylene terephthalate (PET) MylarTM coated with Vapor Deposited Aluminum (VDA). Samples that were part of the Materials International Space Station Experiment (MISSE) experienced diverse effects whilst exposed to the space environment. This sample in particular, …
Space Impact Ejecta Model Of Micrometeoroid Collision On Misse-6, Kelby T. Peterson, Jr Dennison
Space Impact Ejecta Model Of Micrometeoroid Collision On Misse-6, Kelby T. Peterson, Jr Dennison
Presentations
No abstract provided.
Muon Contribution To Cathodoluminescence Tests?, Justin Dekany, Allen Andersen, Jr Dennison
Muon Contribution To Cathodoluminescence Tests?, Justin Dekany, Allen Andersen, Jr Dennison
Presentations
Tests of composites incorporating highly disordered insulating materials that were bombarded with low-flux keV electron beams exhibited three distinct forms of light emission: short-duration (<<1 s), high intensity luminous electrostatic discharges between the insulator and ground--termed “arcs”; intermediate-duration (10-100 s), intense surface emissions—termed “flares”; and lower intensity, continuous surface cathodoluminescent “glow”. During long-duration experiments at temperatures <150 K, relatively intense flare events occurred at rates of ~2 per min. Rapid increase in photon emission and electron displacement current were observed, with long exponential decay times >1 min. We propose that the source of the flares is the interactions of high energy muons—of cosmic ray origin—with the highly-charged insulating components of the composite materials, which trigger avalanche electrostatic discharge and subsequent recharging along with concomitant light emission. We review evidence from the insulator conductivity at low temperatures, the rates and magnitude of surface charging, the flare frequency, and the magnitude and time-dependence of currents and light emission with regard to this …
Extending The Band Model Of Disordered Sio2 Through Cathodoluminescence Studies, Amberly Evans, Gregory Wilson, Jr Dennison, Justin Dekany
Extending The Band Model Of Disordered Sio2 Through Cathodoluminescence Studies, Amberly Evans, Gregory Wilson, Jr Dennison, Justin Dekany
Presentations
Optical coatings of disordered thin film SiO2/SiOx dielectric samples on reflective metal substrates exhibited electron-induced luminescence (cathodoluminescence) under electron beam irradiation in an ultrahigh vacuum chamber at the USU facilities,. These experiments provided measurements of the absolute radiance and emission spectra as functions of incident electron energy, flux and power over a range of sample temperatures (300 K to 40 K). Early results from these experiments have led to a preliminary model of the band structure of highly disordered trapped states within the band gap of SiO2. We now extend this model to further describe …
Power And Charge Deposition In Multilayer Dielectrics From Monoenergetic Electron Bombardment, Gregory Wilson, Amberly Evans, Justin Dekany, Jr Dennison
Power And Charge Deposition In Multilayer Dielectrics From Monoenergetic Electron Bombardment, Gregory Wilson, Amberly Evans, Justin Dekany, Jr Dennison
Presentations
Power and charge deposition in multilayer dielectrics from electron bombardment is dependent upon the flux and electron range of the electron beam, where the range,--a lso known as the penetration depth—is dependent upon the incident beam energy. Using the Continuous Slow Down Approximation (CSDA), a composite analytical formula has been developed to relate the electron range to the dose rate and subsequently to the deposited power in each subsequent layer. Based on the constituent layer geometry and material , the deposited charge can also be inferred. To validate these models two separate experiments were conducted, one based on the net …
High-Frequency Pulsed-Electro-Acoustic (Pea) Measurements For Mapping Charge Distribution, Kristina Sorensen, Lee H. Pearson, Jr Dennison, Timothy E. Doyle, Kent D. Hartley
High-Frequency Pulsed-Electro-Acoustic (Pea) Measurements For Mapping Charge Distribution, Kristina Sorensen, Lee H. Pearson, Jr Dennison, Timothy E. Doyle, Kent D. Hartley
Presentations
No abstract provided.
Power And Charge Deposition In Multilayer Dielectrics Undergoing Monoenergetic Electron Bombardment, Gregory Wilson, Jr Dennison, Amberly Evans, Justin Dekany
Power And Charge Deposition In Multilayer Dielectrics Undergoing Monoenergetic Electron Bombardment, Gregory Wilson, Jr Dennison, Amberly Evans, Justin Dekany
Presentations
No abstract provided.
Space Impact Ejecta Model Of Micrometeoroid Collision On Misse-6, Kelby Peterson, Jr Dennison
Space Impact Ejecta Model Of Micrometeoroid Collision On Misse-6, Kelby Peterson, Jr Dennison
Presentations
No abstract provided.
Power And Charge Deposition In Multilayer Dielectrics Undergoing Monoenergetic Electron Bombardment, Gregory Wilson, Jr Dennison, Amberly Evans Jensen, Justin Dekany
Power And Charge Deposition In Multilayer Dielectrics Undergoing Monoenergetic Electron Bombardment, Gregory Wilson, Jr Dennison, Amberly Evans Jensen, Justin Dekany
Presentations
No abstract provided.
Low Temperature Cathodoluminescence Of Space Observatory Materials, Amberly Evans Jensen, Gregory Wilson, Justin Dekany, Jr Dennison
Low Temperature Cathodoluminescence Of Space Observatory Materials, Amberly Evans Jensen, Gregory Wilson, Justin Dekany, Jr Dennison
Presentations
No abstract provided.
Small Scale Simulation Chamber For Space Environment Survivability Testing, Robert H. Johnson, Lisa Montierth, Jr Dennison, James S. Dyer, Ethan R. Lindstrom
Small Scale Simulation Chamber For Space Environment Survivability Testing, Robert H. Johnson, Lisa Montierth, Jr Dennison, James S. Dyer, Ethan R. Lindstrom
Presentations
No abstract provided.
The Dynamic Interplay Between Spacecraft Charging, Space Environment Interaction And Evolving Materials, Jr Dennison
The Dynamic Interplay Between Spacecraft Charging, Space Environment Interaction And Evolving Materials, Jr Dennison
Presentations
No abstract provided.
Unified Density Of States Based Model Of Electron Transport And Emission Of Spacecraft Materials, Jr Dennison, Alec Sim
Unified Density Of States Based Model Of Electron Transport And Emission Of Spacecraft Materials, Jr Dennison, Alec Sim
Presentations
No abstract provided.
Unified Density Of States Based Model Of Electron Transport And Emission Of Spacecraft Materials, Jr Dennison, Alec Sim
Unified Density Of States Based Model Of Electron Transport And Emission Of Spacecraft Materials, Jr Dennison, Alec Sim
Presentations
No abstract provided.
Defect-Driven Dynamic Model Of Electrostatic Discharge And Endurance Time Measurements Of Polymeric Spacecraft Materials, Charles Sim, Alec Sim, Jr Dennison, Matthew Stromo
Defect-Driven Dynamic Model Of Electrostatic Discharge And Endurance Time Measurements Of Polymeric Spacecraft Materials, Charles Sim, Alec Sim, Jr Dennison, Matthew Stromo
Presentations
No abstract provided.
In Situ Surface Voltage Measurements Of Dielectrics Under Electron Beam Irradiation, Joshua L. Hodges, Jr Dennison, Justin Dekany, Gregory Wilson, Amberly Evans Jensen, Alec Sim
In Situ Surface Voltage Measurements Of Dielectrics Under Electron Beam Irradiation, Joshua L. Hodges, Jr Dennison, Justin Dekany, Gregory Wilson, Amberly Evans Jensen, Alec Sim
Presentations
No abstract provided.
Electron Energy Dependent Charging Effects Of Multilayered Dielectric Materials, Gregory Wilson, Jr Dennison, Amberly Evans Jensen, Justin Dekany
Electron Energy Dependent Charging Effects Of Multilayered Dielectric Materials, Gregory Wilson, Jr Dennison, Amberly Evans Jensen, Justin Dekany
Presentations
No abstract provided.
Micrometeoroid From Misse Examined To Understand The Effects Of The Space Environment On Space Suit, Kelby Peterson, Jr Dennison
Micrometeoroid From Misse Examined To Understand The Effects Of The Space Environment On Space Suit, Kelby Peterson, Jr Dennison
Presentations
No abstract provided.
Simulation Chamber For Space Environment Survivability Testing, Lisa Montierth, Robert H. Johnson, Jr Dennison, James S. Dyer
Simulation Chamber For Space Environment Survivability Testing, Lisa Montierth, Robert H. Johnson, Jr Dennison, James S. Dyer
Presentations
No abstract provided.
Electric Field Dependence Of The Time To Electrostatic Breakdown In Insulating Polymers, Charles Sim, Alec Sim, Jr Dennison
Electric Field Dependence Of The Time To Electrostatic Breakdown In Insulating Polymers, Charles Sim, Alec Sim, Jr Dennison
Presentations
No abstract provided.
The Effect Of Space Environment On Wireless Communication Devices' Performance, Landon Hillyard, Jr Dennison
The Effect Of Space Environment On Wireless Communication Devices' Performance, Landon Hillyard, Jr Dennison
Presentations
No abstract provided.
Electric Field Dependence Of The Time To Electrostatic Breakdown In Insulating Polymers, Charles Sim, Alec Sim, Jr Dennison
Electric Field Dependence Of The Time To Electrostatic Breakdown In Insulating Polymers, Charles Sim, Alec Sim, Jr Dennison
Presentations
No abstract provided.
Simulation Chamber For Space Environment Survivability Testing, Lisa Montierth, Robert H. Johnson, Jr Dennison, James S. Dyer
Simulation Chamber For Space Environment Survivability Testing, Lisa Montierth, Robert H. Johnson, Jr Dennison, James S. Dyer
Presentations
No abstract provided.
Low Temperature Cathodoluminescence In Disordered Sio2, Amberly Evans Jensen, Gregory Wilson, Justin Dekany, Jr Dennison
Low Temperature Cathodoluminescence In Disordered Sio2, Amberly Evans Jensen, Gregory Wilson, Justin Dekany, Jr Dennison
Presentations
No abstract provided.
Micrometeoroid From Misse Examined To Understand The Effects Of The Space Environment On Space Suit, Kelby T. Peterson, Jr Dennison
Micrometeoroid From Misse Examined To Understand The Effects Of The Space Environment On Space Suit, Kelby T. Peterson, Jr Dennison
Presentations
No abstract provided.
The Effect Of Acceleration On Nucleate Boiling And Bubble Departure Dynamics In Microgravity, Jenica Sparrow, Heng Ban, Jr Dennison
The Effect Of Acceleration On Nucleate Boiling And Bubble Departure Dynamics In Microgravity, Jenica Sparrow, Heng Ban, Jr Dennison
Presentations
No abstract provided.
An Electron-Photon Duel: Cathodoluminescence In Disordered Polymeric Materials, Douglas Ball, Alec Sim, Jr Dennison
An Electron-Photon Duel: Cathodoluminescence In Disordered Polymeric Materials, Douglas Ball, Alec Sim, Jr Dennison
Presentations
No abstract provided.
The Effect Of Space Environment On Wireless Communication Devices' Performance, Landon Hillyard, Jr Dennison, Jan J. Sojka
The Effect Of Space Environment On Wireless Communication Devices' Performance, Landon Hillyard, Jr Dennison, Jan J. Sojka
Presentations
No abstract provided.