Phase noise reduction and photoelectron acceleration in a high-Q RF gun

Journal Article · Mon Jun 01 04:00:00 EDT 1998 · IEEE Transactions on Plasma Science

DOI:https://doi.org/10.1109/27.700840· OSTI ID:638443

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

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1. Lawrence Livermore National Lab., CA (United States). Inst. for Laser Science and Applications
2. Lawrence Livermore National Lab., CA (United States)
3. Univ. of California, Los Angeles, CA (United States). Electrical Engineering Dept.
4. Univ. of California, Davis, CA (United States)
5. Synchrotron Radiation Research Center, Hsinchu (Taiwan, Province of 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-mode-locked 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 an 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 mode-locked AlGaAs quantum well laser has been achieved using the X-band gun RF fields. This novel, gigahertz 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.

• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 638443
• Journal Information: IEEE Transactions on Plasma Science, Journal Name: IEEE Transactions on Plasma Science Journal Issue: 3 Vol. 26; ISSN ITPSBD; ISSN 0093-3813
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
BEAM INJECTION
ELECTRON GUNS
FREE ELECTRON LASERS
MICROWAVE AMPLIFIERS
RF SYSTEMS
SOLID STATE LASERS
TRAVELLING WAVE TUBES