Parts | Days | Selection | Search | Updates | Downloads | Help
AKBP: Arbeitskreis Beschleunigerphysik
AKBP 1: Particle and Photon Sources
AKBP 1.3: Talk
Monday, March 20, 2023, 16:30–16:45, CHE/0183
Multi-alkali antimonide photocathodes for highly brilliant electron beams — •Chen Wang1,2, Sonal Mistry1, Julius Kühn1, and Chen Wang1,3 — 1HZB, Berlin, Germany — 2University of Siegen, Institute for Materials Engineering, Siegen, Germany — 3Humboldt University of Berlin, Berlin, Germany
One important goal at the SEALab facility is to bring an innovative superconducting radio-frequency photoelectron injector into operation. As the electron source in the injector, a photocathode with high quantum efficiency (QE) and long operation lifetime is required. The family of multi-alkali antimonide photocathodes deposited on Mo substrate is chosen for this application due to its high QE (>1%) at visible wavelengths and good thermal conductivity. Currently, Na-K-Sb photocathodes are produced in a UHV preparation chamber at the photocathode lab of HZB. The influence of deposition parameters is studied to optimize the growth procedure and to achieve high stability at high operational temperatures as expected in the photoinjector. X-ray photoemission spectroscopy (XPS) and QE measurements are performed, and the correlation between chemical composition and QE value are presented in this contribution.