Phase and amplitude feedback control system for the Los Alamos free-electron laser

Conference · Tue Jan 01 00:00:00 EST 1985

DOI:https://doi.org/10.1109/TNS.1985.4333848· OSTI ID:5698802

Lynch, M T; Tallerico, P J; Higgins, E F

Phase and amplitude feedback control systems for the Los Alamos free-electron laser (FEL) are described. Beam-driven voltages are very high in the buncher cavity because the electron gun is pulsed at the fifth subharmonic of the buncher resonant frequency. The high beam loading necessitated a novel feedback and drive configuration for the buncher. A compensation cirucit has been added to the gun/driver system to reduce observed drift. Extremely small variations in the accelerator gradients had dramatic effects on the laser output power. These problems and how they were solved are described and plans for improvements in the feedback control system are discussed. 5 refs., 7 figs.

• Research Organization: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
• DOE Contract Number: W-7405-ENG-36
• OSTI ID: 5698802
• Report Number(s): LA-UR-85-1205; CONF-850504-12; ON: DE85010787
• Resource Relation: Journal Volume: 32; Journal Issue: 5; Conference: Particle accelerator conference, Vancouver, Canada, 13 May 1985
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
42 ENGINEERING
CONTROL SYSTEMS
FEEDBACK
FREE ELECTRON LASERS
BEAM BUNCHERS
ELECTRON GUNS
LASL
PERFORMANCE
RF SYSTEMS
LASERS
NATIONAL ORGANIZATIONS
US AEC
US DOE
US ERDA
US ORGANIZATIONS
430303* - Particle Accelerators- Experimental Facilities & Equipment
420300 - Engineering- Lasers- (-1989)