1 research outputs found
Kelvin Probe Studies of Cesium Telluride Photocathode for AWA Photoinjector
Cesium telluride is an important photocathode as an electron source for
particle accelerators. It has a relatively high quantum efficiency (>1%), is
sufficiently robust in a photoinjector, and has a long lifetime. This
photocathode is grown in-house for a new Argonne Wakefield Accelerator (AWA)
beamline to produce high charge per bunch (~50 nC) in a long bunch train. Here,
we present a study of the work function of cesium telluride photocathode using
the Kelvin Probe technique. The study includes an investigation of the
correlation between the quantum efficiency and the work function, the effect of
photocathode aging, the effect of UV exposure on the work function, and the
evolution of the work function during and after photocathode rejuvenation via
heating.Comment: 5 pages, 6 figure