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Thermal emittance measurements for electron beams produced from bulk and superlattice negative electron affinity photocathodes
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10.1063/1.2756376
/content/aip/journal/jap/102/2/10.1063/1.2756376
http://aip.metastore.ingenta.com/content/aip/journal/jap/102/2/10.1063/1.2756376
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Schematic view of the emittance measurement method.

Image of FIG. 2.
FIG. 2.

Beam profile on the CCD camera after 30 accumulation cycles and a numerical fit to the data (solid line).

Image of FIG. 3.
FIG. 3.

Each point represents the position of a beamlet in phase-space and the error bars indicate the spread of the divergence angle.

Image of FIG. 4.
FIG. 4.

Schematic view of the laser and transport system.

Image of FIG. 5.
FIG. 5.

Schematic view of the 200-kV polarized electron gun.

Image of FIG. 6.
FIG. 6.

Crystal structure and doping density of the GaAs-GaAsP SL strained sample.

Image of FIG. 7.
FIG. 7.

Normalized rms emittances as a function of the extracted voltage between the electrodes.

Image of FIG. 8.
FIG. 8.

Photoemission process of a NEA photocathode.

Image of FIG. 9.
FIG. 9.

Normalized rms emittances as a function of the laser wavelengths for bulk GaAs.

Image of FIG. 10.
FIG. 10.

Normalized rms emittances as a function of the laser wavelengths for GaAs-GaAsP.

Image of FIG. 11.
FIG. 11.

Comparison of the experimental normalized emittances of bulk GaAs and GaAs-GaAsP as a function of kinetic energy .

Image of FIG. 12.
FIG. 12.

Energy band structure of a GaAs-GaAsP superlattice.

Image of FIG. 13.
FIG. 13.

Normalized rms emittances as a function of quantum efficiency.

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/content/aip/journal/jap/102/2/10.1063/1.2756376
2007-07-17
2014-04-21
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Thermal emittance measurements for electron beams produced from bulk and superlattice negative electron affinity photocathodes
http://aip.metastore.ingenta.com/content/aip/journal/jap/102/2/10.1063/1.2756376
10.1063/1.2756376
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