Abstract
Both the transverse and longitudinal beam dynamics in a photoinjector were investigated experimentally for high-brightness electron beam generation. The transverse emittance growth and the energy spread, both due to the rf and the space-charge effects in the rf gun, were investigated with the laser injection phase. A 31.7 MeV electron beam at 1.0 nC with a normalized rms transverse emittance of 3.2±0.2 mm·mrad, an rms bunch length of 1.8±0.2 ps, and an rms relative energy spread of 0.04±0.01% was obtained in the photoinjector with a 5 ps (full width at half maximum; FWHM) laser. The phase compression in the bunch length was observed in the rf gun. A sub-picosecond electron bunch was observed experimentally in the rf gun at the low injection phase, such as 0.7±0.2 ps at 15° and 0.5±0.1 ps at 10°. The dependences of the transverse emittance, the bunch length and the energy spread on the rf phase of a booster linear accelerator (linac) downstream of the rf gun were investigated experimentally.
Published Version
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