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Terahertz laser modulation of electron beams
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View: Figures


Image of FIG. 1.
FIG. 1.

(Left) Unmodulated (dashed) and modulated (solid) input beam profile. (Right) Calculated form factor for unmodulated (dashed) and modulated (solid) electron beams

Image of FIG. 2.
FIG. 2.

Cumulative plasma oscillations through acceleration to 38 MeV as a function of -coordinate and total charge.

Image of FIG. 3.
FIG. 3.

(Color Online) Block diagram of DUV-FEL facility.

Image of FIG. 4.
FIG. 4.

(Left) Photograph and (right) schematic model of Fabry–Pérot interferometer.

Image of FIG. 5.
FIG. 5.

Cross-correlation measurement of a typical unmodulated drive laser pulse intensity.

Image of FIG. 6.
FIG. 6.

Input laser spectrum (blue) compared with calculation based on model (black).

Image of FIG. 7.
FIG. 7.

Cross-correlation measurement of modulated laser intensity (blue) compared with theory (black) for a cavity spacing of (left) and (right).

Image of FIG. 8.
FIG. 8.

Power spectral density of drive laser pulse for various Fabry–Pérot cavity spacings.

Image of FIG. 9.
FIG. 9.

(Left) rf zero-phase measurement of initially unmodulated compressed electron beam; (right) rf zero-phase measurement of deeply modulated uncompressed electron beam.

Image of FIG. 10.
FIG. 10.

FTIR characterization of terahertz filters.

Image of FIG. 11.
FIG. 11.

Input laser intensity measured with cross correlation.

Image of FIG. 12.
FIG. 12.

(Left) Electron beam longitudinal profile for a 20 pC beam; (right) electron beam longitudinal profile for a 200 pC beam; (inset) initial laser pulse.

Image of FIG. 13.
FIG. 13.

Form factor as a function of frequency and total charge.

Image of FIG. 14.
FIG. 14.

(Left) Form factor peak as a function of charge; (right) frequency at which form factor peaks as a function of charge; (inset) initial laser pulse.

Image of FIG. 15.
FIG. 15.

Peak form factor as a function of accelerator -coordinate and total charge.

Image of FIG. 16.
FIG. 16.

Longitudinal phase space reconstructions at various levels of total charge with a 0.5 THz input laser modulation.

Image of FIG. 17.
FIG. 17.

Projection of longitudinal phase space onto the time coordinate from experimental measurements (solid) and PARMELA simulations (dashed).

Image of FIG. 18.
FIG. 18.

Phase space reconstructions (top) and respective longitudinal projections (bottom) of a beam prebunched at high frequency (left) and of an unmodulated beam (right).

Image of FIG. 19.
FIG. 19.

Electron beam form factor for three different initial laser modulation frequencies.

Image of FIG. 20.
FIG. 20.

Comparison of measured terahertz radiation (with error bars) (blue) with calculations (black) as a function of filter type and total bunch charge.

Image of FIG. 21.
FIG. 21.

PARMELA results showing peak form factor of a prebunched beam as a function of total bunch charge.

Image of FIG. 22.
FIG. 22.

Total terahertz energy incident on bolometer from simulation (diamond), calculation (cross), and actual bolometer measurement (circle).


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Terahertz laser modulation of electron beams