Speaker
Description
High performance electron accelerators require high
brightness electron beams. To achieve this a photocathode
with a high quantum efficiency (QE) and low intrinsic emit-
tance is required while also being robust with a long lifetime
and low dark current. Photocathodes based on alkali metals
can fulfil these requirements and, as such, are an important
area of research for the accelerator physics community.
The Compact Linear Accelerator for Research and Ap-
plications (CLARA) at STFC Daresbury Laboratory has
recently been upgraded from a copper photocathode to a cae-
sium telluride photocathode. This has enabled a significant
increase in bunch charge for a fraction of the laser power. We
discuss the process of manufacturing and polishing molyb-
denum photocathode plugs and the subsequent deposition of
caesium telluride thin films. Three photocathodes have been
provided to the CLARA facility with consistent and high
quantum efficiency. One of these photocathodes has been
successfully operating in CLARA since September 2025
with a stable QE of approximately 11 %.
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