Christensen, Justin

Dennison, JR

Robertson, Matthew

Wilson, Greg

English

Wilson, Gregory

DigitalCommons@USU

Utah State University DigitalCommons@USU Presentations Materials Physics 10-12-2018 Electron Yield of a Carbon-Composite Nanodielectric JR Dennison Utah State Univesity Matthew Robertson Utah State University Gregory Wilson Utah State University Justin Christensen Utah State University Follow this and additional works at: https://digitalcommons.usu.edu/mp_presentations  Part of the Condensed Matter Physics Commons Recommended Citation Dennison, JR; Robertson, Matthew; Wilson, Gregory; and Christensen, Justin, "Electron Yield of a Carbon-Composite Nanodielectric" (2018). Fall 2018 Four Corner Section Meeting of the American Physical Society. Presentations. Paper 155. https://digitalcommons.usu.edu/mp_presentations/155 This Presentation is brought to you for free and open access by the Materials Physics at DigitalCommons@USU. It has been accepted for inclusion in Presentations by an authorized administrator of DigitalCommons@USU. For more information, please contact digitalcommons@usu.edu. Electron Yield of a Carbon-composite NanodielectricElectron YieldIncident Beam0.080.810 100 1000 10000Electron YieldIncident Beam Energy (eV)Comparison of Electron YieldsEpoxyGraphiteGraphite FItEpoxy Fit0.080.810 100 1000 10000Electron YieldIncident Beam Energy (eV)Comparison of Electron YieldsEpoxyGraphiteCarbon FiberGraphite FItEpoxy FitConclusion• Nano Scale structures and Geometry influence the Electron Yield• The insulating Component (the Epoxy matrix) causes charging• Our understanding of the individual components help us understand composite material Yield graphsSEMSEM ContinuedM55J EpoxyTEYσMax 2.5 ± 0.2 2.2 ± 0.3Emax 230 ± 80 256± 50E1 47 ± 1 45± 3E2 960 ± 400 1158± 200Yield Features

Electron Yield of a Carbon-Composite Nanodielectric

Utah State University Student Research Symposium 2018 Logan, UT April 12, 2018   Electron Yield of Carbon-Composite Nanodielectric Material  Matthew Robertson, Justin Christensen, and JR Dennison  Materials Physics Group, Physics Department, Utah State University   Abstract  Electron irradiation experiments were conducted to investigate the electron yield and emission properties of an epoxy/carbon-fiber composite material. The composite material structure consists of alternating layers of a conducting carbon fiber weave and an insulating epoxy matrix. We discuss how this structure made of both conducting and insulating components influences the electron yield and emission properties of the material. Electron yield measurements were made of both the composite material and bulk samples of the two constituent materials in an ultrahigh vacuum electron emission test chamber, with electron beam energies ranging from 15 eV to 30 keV. Related structural and charging properties were also measured with scanning electron microscopy, energy dispersive x-ray analysis, and cathodoluminescence. Models of the total, secondary and backscatter yields as a function of incident energy are presented.  Two limiting cases—a layered model of sheets of conducting and insulating materials and a patch model of adjacent regions of bulk conducting and insulating materials—are used to predict the yield curve of the composite material, along with models combining aspects of both of these limits. 

Electron Yield of a Carbon-composite Nanodielectric

https://digitalcommons.usu.edu/cgi/viewcontent.cgi?article=1169&amp;context=mp_presentations

Electron Yield of a Carbon-composite Nanodielectric

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