Suppression of mode-beating in a saturated hole-coupled FEL oscillator

Conference · Sat Aug 01 00:00:00 EDT 1992

OSTI ID:10191662

Krishnagopal, S; Xie, M; Kim, K J

In a hole-coupled resonator, either empty or loaded with a linear FEL gain medium, the phenomenon of mode-degeneracy and mode-beating have been studied. When the magnitudes of the eigenvalues, derived from a linear analysis, are equal for two or more dominant eigenmodes, the system cannot achieve a stable beam-profile. We investigate this phenomenon when a saturated FEL is present within the cavity, thus introducing non-linearity. We use a three-dimensional FEL oscillator code, based on the amplifier code TDA, and show that mode-beating is completely suppressed in the nonlinear saturated regime. We suggest a simple, qualitative model for the mechanism responsible for this suppression.

• Research Organization: Lawrence Berkeley Lab., CA (United States)
• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: AC03-76SF00098
• OSTI ID: 10191662
• Report Number(s): LBL-32223; CONF-9208142-12; ESG-183; ON: DE93002554
• Resource Relation: Conference: International free electron laser (FEL) conference,Kobe (Japan),23-28 Aug 1992; Other Information: PBD: Aug 1992
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
FREE ELECTRON LASERS
MODE CONTROL
OPERATION
WIGGLER MAGNETS
EIGENVALUES
RESONATORS
GAIN
COMPUTERIZED SIMULATION
430100
DESIGN, DEVELOPMENT, AND OPERATION