X-band photoinjector for a chirped-pulse FEL

The phase noise and jitter characteristics of the laser and rf systems of a high gradient X-band photoinjector have been measured experimentally. The laser oscillator is a self-modelocked Titanium:Sapphire system operating at the 108th subharmonic of the rf gun. The X-band signal is produced from th...

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Bibliographic Details
Published in:AIP conference proceedings 1999-05, Vol.474 (1)
Main Authors: Landahl, E. C., Alvis, R. M., Troha, A. L., Hartemann, F. V., Baldis, H. A., Institute for Laser Science and Applications, LLNL, Livermore, California 94550, Le Sage, G. P., White, W. E., Bennett, C. V., Li, K., Heritage, J. P., Ho, C. H., Luhmann, N. C. Jr
Format: Article
Language:English
Subjects:
ALUMINIUM ARSENIDES
AMPLIFIERS
COMPARATIVE EVALUATIONS
ELECTRIC CURRENTS
FREE ELECTRON LASERS
GALLIUM ARSENIDES
GHZ RANGE
KLYSTRONS
MODULATION
OSCILLATORS
PARTICLE ACCELERATORS
PHOTOCATHODES
PULSES
QUANTUM WELLS
RF SYSTEMS
SOLID STATE LASERS
TRAVELLING WAVE TUBES
ULTRAVIOLET SPECTRA
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Summary:The phase noise and jitter characteristics of the laser and rf systems of a high gradient X-band photoinjector have been measured experimentally. The laser oscillator is a self-modelocked Titanium:Sapphire system operating at the 108th subharmonic of the rf gun. The X-band signal is produced from the laser by a phase-locked dielectric resonance oscillator, and amplified by a pulsed TWT and klystron. A comparison between the klystron and TWT amplifier phase noise and the fields excited in the rf gun demonstrates the filtering effect of the high Q structure, thus indicating that the rf gun can be used as a master oscillator, and could be energized by either a rf oscillator such as a magnetron or a compact source such as a cross-field amplifier. In particular, the rf gun can play the role of a pulsed rf clock to synchronize the photocathode laser system: direct drive of a synchronously modelocked AlGaAs quantum well laser has been achieved using the X-band gun rf fields. This novel, GHz repetition rate, laser system is being developed to replace the more conventional femtosecond Ti:Al{sub 2}O{sub 3} system. Some advantages include pumping this laser with a stabilized current source instead of a costly, low efficiency pump laser. Finally, dark current measurements and initial photoelectron measurements are reported.
ISSN:0094-243X
1551-7616
DOI:10.1063/1.59044