Status of CsBr Photocathodes Juan R. Maldonado, David Dowell, Jeff Corbett, Sam Park, John Schmerge, Alan Fisher, Piero Pianetta, Ann Trautwein SLAC, National.

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Presentation transcript:

Status of CsBr Photocathodes Juan R. Maldonado, David Dowell, Jeff Corbett, Sam Park, John Schmerge, Alan Fisher, Piero Pianetta, Ann Trautwein SLAC, National Accelerator Laboratory Menlo Park, CA and William Clay Stanford University 94305

Outline CW Performance of CsBr photocathodes Energy Spread/Emittance Measurements Pulsed Behavior

Behavior of CsBr coated Cu

ENERGY SPREAD/EMITTANCE MEASUREMENTS

ENERGY SPREAD ANALYZER

Energy Spread Measurements

Emittance calculation from 3 step model agrees with experimental value

Pulsed Behavior of CsBr Photocathodes

Apparent QE of CsBr on Cu

Jedi Laser 7 nsec

Summary The 3 step model predicts the observed emittance and QE in CsBr/Cu. The small increase in emittance observed in CsBr/Cu over Cu is a small price to pay relative to the large QE gain observed. The observed QE behavior of CsBr/Cu is limited by space charge due to the relatively low extraction voltage utilized in the experiments. CsBr/Cu survived short pulse operation without ablation. Future experiment: Operation in a microwave cavity