Intrinsic emittance reduction in transmission mode photocathodes

Lee, Hyeri; Cultrera, Luca; Bazarov, Ivan

doi:10.1063/1.4944790

Intrinsic emittance reduction in transmission mode photocathodes

Journal Article · Thu Mar 24 00:00:00 EDT 2016 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4944790· OSTI ID:1469694

Lee, Hyeri ^[1]; ^[2]; Bazarov, Ivan ^[2]

Cornell Univ., Ithaca, NY (United States). Cornell Lab. for Accelerator-Based Sciences and Education (CLASSE); Cornell University
Cornell Univ., Ithaca, NY (United States). Cornell Lab. for Accelerator-Based Sciences and Education (CLASSE)

High quantum efficiency (QE) and low emittance electron beams provided by multi-alkali photocathodes make them of great interest for next generation high brightness photoinjectors. Spicer’s three-step model well describes the photoemission process; however, some photocathode characteristics such as their thickness have not yet been completely exploited to further improve the brightness of the generated electron beams. Here, we report on the emittance and QE of a multi-alkali photocathode grown onto a glass substrate operated in transmission and reflection modes at different photon energies. We observed a 20% reduction in the intrinsic emittance from the reflection to the transmission mode operation. This observation can be explained by inelastic electron-phonon scattering during electrons’ transit towards the cathode surface. Due to this effect, we predict that thicker photocathode layers will further reduce the intrinsic emittance of electron beams generated by photocathodes operated in transmission mode.

View Accepted Manuscript (DOE)

Research Organization:: Cornell Univ., Ithaca, NY (United States)

Sponsoring Organization:: National Science Foundation (NSF); USDOE Office of Science (SC)

Grant/Contract Number:: SC0011643; SC0014338

OSTI ID:: 1469694

Alternate ID(s):: OSTI ID: 1243144
OSTI ID: 22591490

Journal Information:: Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 12 Vol. 108; ISSN APPLAB; ISSN 0003-6951

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Rb based alkali antimonide high quantum efficiency photocathodes for bright electron beam sources and photon detection applications Cultrera, L.; Gulliford, C.; Bartnik, A. Journal of Applied Physics, Vol. 121, Issue 5 https://doi.org/10.1063/1.4975469	journal	February 2017

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Intrinsic emittance reduction in transmission mode photocathodes

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