X-band photoinjector for a chirped-pulse FEL
- Applied Science Department, University of California, Davis California 95616 (United States)
- Lawrence Livermore National Laboratory, Livermore, California 94550 (United States)
- Electrical Engineering Department, University of California, Los Angeles, California 90024 (United States)
- Electrical and Computer Engineering Department, University of California, Davis, California (United States)
- Synchrotron Radiation Research Center, Taiwan (China)
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.
- OSTI ID:
- 21205515
- Journal Information:
- AIP Conference Proceedings, Vol. 474, Issue 1; Conference: RF98 workshop on high energy density microwaves, Pajaro Dunes, CA (United States), 5-8 Oct 1998; Other Information: DOI: 10.1063/1.59044; (c) 1999 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
- Country of Publication:
- United States
- Language:
- English
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