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Title | Physical and Chemical Roughness of Alkali-Animonide Cathodes | |||||
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Abstract | Over the last decade, alkali-antimonides have been investigated as high QE cathodes in green light and more recently as ultra-low intrinsic emittance cathodes in near-threshold red wavelengths at cryogenic temperatures*. Nano-meter scale surface non-uniformities (physical roughness and chemical roughness or work function variations) are thought to limit the smallest possible emittance from these materials at the photoemission threshold under cryogenic conditions**. Despite this, the surfaces of alkali-antimonides have not been well characterized in terms of the surface non-uniformities. Here, we present measurements of both the physical and chemical roughness of alkali-antimonide surfaces using several surface characterization techniques like atomic force microscopy, kelvin probe force microscopy, low energy electron microscopy and near-threshold photoemission electron microscopy and show how such non-uniformities limit the intrinsic emittance. | |||||
Footnotes & References | *L. Cultrera et al Phys. Rev. ST Accel. Beams 18, 113401 (2015) **J. Feng et al, J. of Appl. Phys. 121, 044904 (2017) |
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Paper | download THPMF080.PDF [1.231 MB / 4 pages] | |||||
Export | download ※ BibTeX ※ LaTeX ※ Text/Word ※ RIS ※ EndNote | |||||
Conference | IPAC2018, Vancouver, BC, Canada | |||||
Series | International Particle Accelerator Conference (9th) | |||||
Proceedings | Link to full IPAC2018 Proccedings | |||||
Session | MC2 Poster Session | |||||
Date | 03-May-18 16:00–17:30 | |||||
Main Classification | 02 Photon Sources and Electron Accelerators | |||||
Sub Classification | T02 Electron Sources | |||||
Keywords | cathode, electron, emittance, laser, vacuum | |||||
Publisher | JACoW Publishing, Geneva, Switzerland | |||||
Editors | Shane Koscielniak (TRIUMF, Vancouver, BC, Canada); Todd Satogata (JLab, Newport News, VA, USA); Volker RW Schaa (GSI, Darmstadt, Germany); Jana Thomson (TRIUMF, Vancouver, BC, Canada) | |||||
ISBN | 978-3-95450-184-7 | |||||
Published | June 2018 | |||||
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