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

Abstract

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.

Authors:
; ;
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
OSTI Identifier:
5698802
Report Number(s):
LA-UR-85-1205; CONF-850504-12
ON: DE85010787
DOE Contract Number:  
W-7405-ENG-36
Resource Type:
Conference
Resource Relation:
Conference: Particle accelerator conference, Vancouver, Canada, 13 May 1985
Country of Publication:
United States
Language:
English
Subject:
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)

Citation Formats

Lynch, M T, Tallerico, P J, and Higgins, E F. Phase and amplitude feedback control system for the Los Alamos free-electron laser. United States: N. p., 1985. Web.
Lynch, M T, Tallerico, P J, & Higgins, E F. Phase and amplitude feedback control system for the Los Alamos free-electron laser. United States.
Lynch, M T, Tallerico, P J, and Higgins, E F. Tue . "Phase and amplitude feedback control system for the Los Alamos free-electron laser". United States. https://www.osti.gov/servlets/purl/5698802.
@article{osti_5698802,
title = {Phase and amplitude feedback control system for the Los Alamos free-electron laser},
author = {Lynch, M T and Tallerico, P J and Higgins, E F},
abstractNote = {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.},
doi = {},
url = {https://www.osti.gov/biblio/5698802}, journal = {},
number = ,
volume = ,
place = {United States},
year = {1985},
month = {1}
}

Conference:
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