Comparison Between H-Ion and Heat Cleaning of Cu-Metal Cathodes

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Understanding the quantum efficiency (QE) of a metal photocathode in an s-band RF gun is important to limit the drive laser energy requirement and provide the best quality electron beam. Systematic measurements of the qe vs. wavelength for varying surface contamination have been performed on copper samples using x-ray photoelectron spectroscopy (XPS). The sample is first cleaned to the theoretical limit of QE using a 1 keV hydrogen ion beam. The H-ion beam cleans an area approximately 1cm in diameter and has no effect on the surface roughness while removing essentially all contaminants and lowering the work function to 4.3eV[1]. ... continued below

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3 pages

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Dowell, D.H.; King, F.K.; Kirby, R.E.; /SLAC; Schmerge, J.F. & /SLAC, SSRL August 18, 2006.

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Description

Understanding the quantum efficiency (QE) of a metal photocathode in an s-band RF gun is important to limit the drive laser energy requirement and provide the best quality electron beam. Systematic measurements of the qe vs. wavelength for varying surface contamination have been performed on copper samples using x-ray photoelectron spectroscopy (XPS). The sample is first cleaned to the theoretical limit of QE using a 1 keV hydrogen ion beam. The H-ion beam cleans an area approximately 1cm in diameter and has no effect on the surface roughness while removing essentially all contaminants and lowering the work function to 4.3eV[1]. The sample is then exposed to atmospheric contaminants (nitrogen and oxygen) and measured again with XPS to determine the degree of contamination and their effect on the QE. These results and comparison with theory are presented.

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3 pages

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  • Presented at European Particle Accelerator Conference (EPAC 06), Edinburgh, Scotland, 26-30 Jun 2006

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  • Report No.: SLAC-PUB-12070
  • Grant Number: AC02-76SF00515
  • Office of Scientific & Technical Information Report Number: 889663
  • Archival Resource Key: ark:/67531/metadc884604

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  • August 18, 2006

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  • Sept. 21, 2016, 2:29 a.m.

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  • Nov. 22, 2016, 10:59 p.m.

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Dowell, D.H.; King, F.K.; Kirby, R.E.; /SLAC; Schmerge, J.F. & /SLAC, SSRL. Comparison Between H-Ion and Heat Cleaning of Cu-Metal Cathodes, article, August 18, 2006; [Menlo Park, California]. (digital.library.unt.edu/ark:/67531/metadc884604/: accessed September 22, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.