25–30 Aug 2024
Hilton Chicago
America/Chicago timezone

Development of Bi-Alkali antimonide photocathodes for a 1.3 GHz superconducting rf photo-injector

TUPB015
27 Aug 2024, 16:00
2h
Boulevard (Hilton Chicago)

Boulevard

Hilton Chicago

720 South Michigan Ave Chicago, IL 60605 USA
Poster Presentation MC1.2 Electron and ion sources, guns, photo injectors, charge breeders Tuesday Poster Session

Speaker

Ziye Yin (Facility for Rare Isotope Beams, Michigan State University)

Description

Superconducting Radio Frequency (SRF) photo-injectors offer the possibility of producing low-emittance electron beams in continuous wave operation. Among the various photo-emissive materials, bi-alkali antimonide is favored for its high quantum efficiency (QE) at visible light wavelengths. A development effort at FRIB is oriented toward the integration of advanced photocathodes into an SRF photo-injector. This paper describes improvements to the cathode preparation chamber, first cathode depositions, and characterization trials. A K2CsSb film was produced with a notably extended dark lifetime, albeit with a modest QE of approximately 5% at 530nm. Extensive spectral response analyses of the layer were conducted, along with thorough assessments of measurement procedures and hardware. This presentation offers insights into the factors contributing to the measured QE and describes plans for improving the cathode preparation chamber and the experimental procedures.

Funding Agency

Work funded by Michigan State University
yin@frib.msu.edu

Primary author

Ziye Yin (Facility for Rare Isotope Beams, Michigan State University)

Co-authors

Dr John Lewellen (Los Alamos National Laboratory) John Smedley (SLAC National Accelerator Laboratory) Sang-Hoon Kim (Facility for Rare Isotope Beams, Michigan State University) Taro Konomi (Facility for Rare Isotope Beams) Ting Xu (Facility for Rare Isotope Beams) Walter Hartung (Facility for Rare Isotope Beams, Michigan State University)

Presentation materials

There are no materials yet.