X-band photoinjector for a chirped-pulse FEL

Journal Article · Fri May 07 04:00:00 EDT 1999 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.59044· OSTI ID:21205515

Landahl, E C; Alvis, R M; Troha, A L; Hartemann, F V; Baldis, H A ^[1]; Le Sage, G P; White, W E ^[2]; Bennett, C V ^[3]; Li, K; Heritage, J P ^[4]; Ho, C H ^[5]; Luhmann, Jr, N C ^[1]

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1. Applied Science Department, University of California, Davis California 95616 (United States)
2. Lawrence Livermore National Laboratory, Livermore, California 94550 (United States)
3. Electrical Engineering Department, University of California, Los Angeles, California 90024 (United States)
4. Electrical and Computer Engineering Department, University of California, Davis, California (United States)
5. 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, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 474; ISSN APCPCS; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
ALUMINIUM ARSENIDES
AMPLIFIERS
COMPARATIVE EVALUATIONS
ELECTRIC CURRENTS
FREE ELECTRON LASERS
GALLIUM ARSENIDES
GHZ RANGE
KLYSTRONS
MODULATION
OSCILLATORS
PHOTOCATHODES
PULSES
QUANTUM WELLS
RF SYSTEMS
SOLID STATE LASERS
TRAVELLING WAVE TUBES
ULTRAVIOLET SPECTRA