(Left) Unmodulated (dashed) and modulated (solid) input beam profile. (Right) Calculated form factor for unmodulated (dashed) and modulated (solid) electron beams
Cumulative plasma oscillations through acceleration to 38 MeV as a function of -coordinate and total charge.
(Color Online) Block diagram of DUV-FEL facility.
(Left) Photograph and (right) schematic model of Fabry–Pérot interferometer.
Cross-correlation measurement of a typical unmodulated drive laser pulse intensity.
Input laser spectrum (blue) compared with calculation based on model (black).
Cross-correlation measurement of modulated laser intensity (blue) compared with theory (black) for a cavity spacing of (left) and (right).
Power spectral density of drive laser pulse for various Fabry–Pérot cavity spacings.
(Left) rf zero-phase measurement of initially unmodulated compressed electron beam; (right) rf zero-phase measurement of deeply modulated uncompressed electron beam.
FTIR characterization of terahertz filters.
Input laser intensity measured with cross correlation.
(Left) Electron beam longitudinal profile for a 20 pC beam; (right) electron beam longitudinal profile for a 200 pC beam; (inset) initial laser pulse.
Form factor as a function of frequency and total charge.
(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.
Peak form factor as a function of accelerator -coordinate and total charge.
Longitudinal phase space reconstructions at various levels of total charge with a 0.5 THz input laser modulation.
Projection of longitudinal phase space onto the time coordinate from experimental measurements (solid) and PARMELA simulations (dashed).
Phase space reconstructions (top) and respective longitudinal projections (bottom) of a beam prebunched at high frequency (left) and of an unmodulated beam (right).
Electron beam form factor for three different initial laser modulation frequencies.
Comparison of measured terahertz radiation (with error bars) (blue) with calculations (black) as a function of filter type and total bunch charge.
PARMELA results showing peak form factor of a prebunched beam as a function of total bunch charge.
Total terahertz energy incident on bolometer from simulation (diamond), calculation (cross), and actual bolometer measurement (circle).
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