Phase noise reduction and photoelectron acceleration in a high-Q RF gun
- Lawrence Livermore National Lab., CA (United States). Inst. for Laser Science and Applications
- Lawrence Livermore National Lab., CA (United States)
- Univ. of California, Los Angeles, CA (United States). Electrical Engineering Dept.
- Univ. of California, Davis, CA (United States)
- 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, Vol. 26, Issue 3; Other Information: PBD: Jun 1998
- Country of Publication:
- United States
- Language:
- English
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