GaAs photocathode activation with CsTe thin film

Masao Kuriki, Yuji Seimiya, Kazuhide Uchida, Shigeru Kashiwagi

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

GaAs is an unique and advanced photocathode which can generate highly polarized and extremely low emittance electron beam. The photo-emission is possible up to 900nm wavelength. These advantages are due to NEA (Negative Electron Affinity) surface where the conduction band minimum is higher than the vacuum energy state. The NEA surface is artificially made with Cs-O/F evaporation on the cleaned GaAs surface, but the NEA surface is fragile, so that the emission is easily lost by poor vacuum environment and high emission density. NEA activation with any vital material is desirable. We found that the GaAs can be activated by CsTe thin film which is known as a vital photo-cathode material. The photo-electron emission spectrum extends up to 900 nm wavelength which corresponds to the band-gap energy of GaAs. The result strongly suggests that the surface becomes effectively NEA state by the CsTe thin film.

Original languageEnglish
Title of host publication6th International Particle Accelerator Conference, IPAC 2015
PublisherJoint Accelerator Conferences Website (JACoW)
Pages1567-1569
Number of pages3
ISBN (Electronic)9783954501687
Publication statusPublished - 2015
Event6th International Particle Accelerator Conference, IPAC 2015 - Richmond, United States
Duration: 2015 May 32015 May 8

Publication series

Name6th International Particle Accelerator Conference, IPAC 2015

Other

Other6th International Particle Accelerator Conference, IPAC 2015
CountryUnited States
CityRichmond
Period15/5/315/5/8

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Atomic and Molecular Physics, and Optics

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  • Cite this

    Kuriki, M., Seimiya, Y., Uchida, K., & Kashiwagi, S. (2015). GaAs photocathode activation with CsTe thin film. In 6th International Particle Accelerator Conference, IPAC 2015 (pp. 1567-1569). (6th International Particle Accelerator Conference, IPAC 2015). Joint Accelerator Conferences Website (JACoW).