Development of Bright Electron Sources

Project: Research project

Project Details

Description

Development of Bright Electron Sources Development of Bright Electron Sources This effort will be used to carry out the Center for Bright Beams (CBB) research and other activities at the Arizona State University. Research conducted under the project will predominantly pertain to the beam production research theme of CBB. It will include performing the study of the physics of photoemission, developing growth techniques for photocathode materials, developing photoemission and bright beam diagnostics and developing high brightness electron sources. Details of the work to be performed will be updated annually in accordance with the evolving goals of the CBB. Center for Bright Beams 1. Development of UED with novel photocathode materials This project focuses on developing an electron gun and test beamline that will allow the test novel photocathode materials and nanostructures developed within CBB under extreme intensity and high electric field conditions and generate low MTE electron beams suitable for single shot UED applications. It will also experimentally and theoretically investigate the beam dynamics and emittance conservation techniques required to transport the electron beam generated from the novel and nanostructured photocathodes to the sample without brightness degradation. 2. Measuring Electron energy distributions from Non-linear photoemission phenomena This project will experimentally the various phenomena that occur during non-linear photoemission. Energy and momentum distributions of electrons emitted by near-threshold wavelengths via non-linear emission phenomena of electron heating and multiphoton emission will be measured and their effects o MTE will be characterized. The goal will be to identify and develop photocathode materials that exhibit minimal MTE increase due to non-linear photoemission. 3. Development and characterization of nano-sized photoemission electron sources This project will be aimed at designing, developing and characterizing nano-sized photoemission-based electron sources. Nano-structured light focusing designs based on immersion lenses and plasmonic focusing will be investigated. These structures will be fabricated using the nano-fabrication facilities at ASU or LBNL. The performance of these structures in terms of achieving a small emission area and a small MTE will be characterized. Center for Bright Beams The supplemental funding will be used to support 3 ASU undergrads over summer 2021. They will work of 3 different projects related to the Center for Bright Beams. The first undergrad will work to develop simulations of nano-scale photoemission sources. These simulations will include modelling the effects of point-to-point coulomb interactions from and performing electromagnetic simulations to design structures that will focus light to sub-100 nm scales. The second undergrad will work to measure electron energy distributions from photocathode samples using the time-of-flight energy analyzer. Several samples including single crystal metal surfaces will be studied. The third undergrad will work on developing the DC-cryogun and the cathode diagnostic beamline. The student will help with the assembly and commissioning of the gun and also be responsible for designing the slit-scan technique to measure emittance. Center for Bright Beams The first undergrad will work on commissioning the DC electron gun, obtaining an electron beam and developing the emittance measurement diagnostics. The second undergrad will work on developing a labview based control system for the DC electron gun. The student will also help with the high voltage commissioning of the gun. The third undergrad will work on measuring the spot size of nanometer sized electron sources using the Photoemission Electron Microscope and characterizing the work function variations using this instrument.
StatusActive
Effective start/end date8/19/189/30/22

Funding

  • National Science Foundation (NSF): $1,745,293.00

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