X-band photoinjector for a chirped-pulse FEL

Journal Article · Sat May 01 04:00:00 EDT 1999 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.59044· OSTI ID:690668

Landahl, E C; Alvis, R M; Troha, A L; Hartemann, F V; Baldis, H A; Luhmann, Jr, N C ^[1]; Landahl, E C; Alvis, R M; Troha, A L; Hartemann, F V; Baldis, H A ^[2]; Le Sage, G P; White, W E ^[3]; Bennett, C V ^[4]; Li, K; Heritage, J P ^[5]; Ho, C H ^[6]

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1. Applied Science Department, University of California, Davis , California 95616 (United States)
2. Institute for Laser Science and Applications, LLNL, Livermore, California 94550 (United States)
3. Lawrence Livermore National Laboratory, Livermore, California 94550 (United States)
4. Electrical Engineering Department, University of California, Los Angeles, California 90024 (United States)
5. Electrical and Computer Engineering Department, University of California, Davis, California (United States)
6. Synchrotron Radiation Research Center (Taiwan)

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. {copyright} {ital 1999 American Institute of Physics.}

• Research Organization: Lawrence Livermore National Laboratory
• Sponsoring Organization: USDOE
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 690668
• Report Number(s): CONF-981099--
• Journal Information: AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 474; ISSN 0094-243X; ISSN APCPCS
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
ELECTRON BEAMS
ELECTRON GUNS
FREE ELECTRON LASERS
KLYSTRONS
NOISE
PHOTOCATHODES
PHOTOEMISSION
SEMICONDUCTOR LASERS
TRAVELLING WAVE TUBES
ULTRAVIOLET RADIATION
ULTRAVIOLET SPECTRA