Measurement of thermal emittance for a copper photocathode

Measurements of the thermal emittance of an electron beam produced by photoemission from the copper cathode of a high power RF cavity are presented. The RMS normalized emittance has been measured as a function of laser spot size, applied surface field, and polarization of the laser beam at normal in...

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Bibliographic Details
Published inPACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268) Vol. 3; pp. 2227 - 2229 vol.3
Main Authors Graves, W.S., DiMauro, L.F., Heese, R., Johnson, E.D., Rose, J., Rudati, J., Shaftan, T., Sheehy, B.
Format Conference Proceeding
LanguageEnglish
Japanese
Published IEEE 2001
Subjects
Cathodes
Copper
Electron beams
Laser beams
Photoelectricity
Polarization
Power measurement
Radio frequency
Size measurement
Surface emitting lasers
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Summary:Measurements of the thermal emittance of an electron beam produced by photoemission from the copper cathode of a high power RF cavity are presented. The RMS normalized emittance has been measured as a function of laser spot size, applied surface field, and polarization of the laser beam at normal incidence. Local field enhancement due to surface effects is found to increase the emittance substantially beyond that expected for a perfect planar surface.
ISBN:9780780371910
0780371917
DOI:10.1109/PAC.2001.987332