Kelvin probe studies of cesium telluride photocathode for the AWA photoinjector | Zendy

Daniel Velázquez | Zendy; Eric Wisniewski | Zendy; Z. Yusof | Zendy; K. Harkay | Zendy; Linda Spentzouris | Zendy; Jeff Terry | Zendy

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Kelvin probe studies of cesium telluride photocathode for the AWA photoinjector

Author(s) -

Daniel Velázquez,

Eric Wisniewski,

Z. Yusof,

K. Harkay,

Linda Spentzouris,

Jeff Terry

Publication year - 2012

Publication title -

aip conference proceedings

Language(s) - English

Resource type - Conference proceedings

eISSN - 1551-7616

pISSN - 0094-243X

DOI - 10.1063/1.4773797

Subject(s) - photocathode , work function , beamline , optics , quantum efficiency , particle accelerator , physics , optoelectronics , electron , nuclear physics , beam (structure) , quantum mechanics , electrode

Cesium telluride is an important photocathode as an electron source for particle accelerators. It has a relatively high quantum efficiency (> 1%), is robust in a photoinjector, and long lifetime. This photocathode is fabricated in-house for a new Argonne Wakefield Accelerator (AWA) beamline to produce high charge per bunch (∼50 nC) in a long bunch train. We present some results from 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 light exposure on the work function, and the evolution of the work function during and after photocathode rejuvenation via heating.

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