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Transverse and longitudinal space-charge-induced broadenings of ultrafast electron packets
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10.1063/1.2128494
/content/aip/journal/jap/98/9/10.1063/1.2128494
http://aip.metastore.ingenta.com/content/aip/journal/jap/98/9/10.1063/1.2128494
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Picosecond photocathode electron source (transmission mode). The dashed line represents a typical trajectory for the pulse envelope. Inset: cross section of a cylindrical pulse of length and radius .

Image of FIG. 2.
FIG. 2.

Radius of the transverse profile of electron pulses at a distance of from the pinhole, as a function of the laser beam radius . Measurements (×) and calculations (solid line) with a photocathode current , except for the left points × and ◻ : . Dashed line: effect of the diverging lens and initial kinetic energy without space-charge effects. and .

Image of FIG. 3.
FIG. 3.

Radius of the transverse profile of electron pulses at a distance of from the pinhole, as a function of the acceleration voltage, for two different laser beam radii. The current-voltage conditions are the same for measurements (×) and calculations (◻): , , , and for (a) and , , , and for (b).

Image of FIG. 4.
FIG. 4.

Calculated pulse radius (a) and pulse duration (b) of electron pulses at the end of the extraction region, as a function of the initial pulse width . Acceleration voltage: ; distance: ; current: .

Image of FIG. 5.
FIG. 5.

Simulation of the trajectories of electron pulses in the photocathode-to-mesh region for different initial pulse radii (, , and ).

Image of FIG. 6.
FIG. 6.

Calculation of the kinetic-energy spread (solid line: longitudinal; dashed line: transverse) as a function of the initial pulse width (, , and ).

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/content/aip/journal/jap/98/9/10.1063/1.2128494
2005-11-15
2014-04-23
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Transverse and longitudinal space-charge-induced broadenings of ultrafast electron packets
http://aip.metastore.ingenta.com/content/aip/journal/jap/98/9/10.1063/1.2128494
10.1063/1.2128494
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