Photocathode behavior during high current running in the Cornell energy recovery linac photoinjector

Luca Cultrera, Jared Maxson, Ivan Bazarov, Sergey Belomestnykh, John Dobbins, Bruce Dunham, Siddharth Karkare, Roger Kaplan, Vaclav Kostroun, Yulin Li, Xianghong Liu, Florian Löhl, Karl Smolenski, Zhi Zhao, David Rice, Peter Quigley, Maury Tigner, Vadim Veshcherevich, Kenneth Finkelstein, Darren DaleBenjamin Pichler

Research output: Contribution to journalArticle

29 Scopus citations

Abstract

The Cornell University energy recovery linac (ERL) photoinjector has recently demonstrated operation at 20 mA for approximately 8 hours, utilizing a multialkali photocathode deposited on a Si substrate. We describe the recipe for photocathode deposition, and will detail the parameters of the run. Post-run analysis of the photocathode indicates the presence of significant damage to the substrate, perhaps due to ion back-bombardment from the residual beam line gas. While the exact cause of the substrate damage remains unknown, we describe multiple surface characterization techniques (x-ray fluorescence spectroscopy, x-ray diffraction, atomic force, and scanning electron microscopy) used to study the interesting morphological and crystallographic features of the photocathode surface after its use for high current beam production. Finally, we present a simple model of crystal damage due to ion back-bombardment, which agrees qualitatively with the distribution of damage on the substrate surface.

Original languageEnglish (US)
Article number120101
JournalPhysical Review Special Topics - Accelerators and Beams
Volume14
Issue number12
DOIs
StatePublished - Dec 8 2011
Externally publishedYes

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Physics and Astronomy (miscellaneous)
  • Surfaces and Interfaces

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    Cultrera, L., Maxson, J., Bazarov, I., Belomestnykh, S., Dobbins, J., Dunham, B., Karkare, S., Kaplan, R., Kostroun, V., Li, Y., Liu, X., Löhl, F., Smolenski, K., Zhao, Z., Rice, D., Quigley, P., Tigner, M., Veshcherevich, V., Finkelstein, K., ... Pichler, B. (2011). Photocathode behavior during high current running in the Cornell energy recovery linac photoinjector. Physical Review Special Topics - Accelerators and Beams, 14(12), [120101]. https://doi.org/10.1103/PhysRevSTAB.14.120101