Free electron laser short pulse simulation and two-mode sideband analysis
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Authors
Cord, Gregory A.
Subjects
FEL
Short pulse simulation
two-mode analysis
sidebands
Short pulse simulation
two-mode analysis
sidebands
Advisors
Colson, W.B.
Date of Issue
1991-06
Date
Publisher
Monterey, California. Naval Postgraduate School
Language
en_US
Abstract
The Stanford Free Electron Laser (FEL), like many FELs is driven by extremely
short electron pulses which drive equally short optical pulses. Simulations of the
Stanford FEL describe the trapped-particle instability leading to sideband frequencies
and limit-cycle behavior. Comparisons are made of recent experimental results that
show close agreement between the desynchronism curves, optical spectra, and the
electron spectra.
The second part of this thesis analyzes sideband behavior when two modes are
present in an FEL oscillator. Using two-mode wave and pendulum equations derived
from Maxwell's and the Lorentz force equations, the gain and phase shift for each
initial phase of the two-mode optical field can be determined numerically. Averaging
over all initial phases determines the FEL optical performance. In steady-state the
presence of the sideband effectively reduces the undulator's length, delaying the onset
of saturation. This allows more power to be generated in the optical field then
possible with only a single mode.
Type
Thesis
Description
Series/Report No
Department
Physics
Organization
Naval Postgraduate School
Identifiers
NPS Report Number
Sponsors
Funder
Format
56 p.;28 cm.
Citation
Distribution Statement
Approved for public release; distribution is unlimited.