Limit-cycle behavior in free electron lasers
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Authors
Mabe, Roger M.
Subjects
Advisors
Armstead, Robert L.
Colson, W.B.
Date of Issue
1995-12
Date
December 1995
Publisher
Monterey, California. Naval Postgraduate School
Language
en_US
Abstract
Many Free Electron Lasers (FEL) are driven by short electron pulses which create equally short optical pulses. At saturation, the strong optical fields present in the undulator result in the trapped particle instability which drives the carrier wave unstable and modulates the optical pulse. The trapped particle instability coupled with the short optical pulses can result in periodic oscillations of the pulse shape. This results in oscillations of the output power even though all input parameters are constant. The effect is known as limit cycle behavior. The character of the oscillation is highly nonlinear and is dependent on the physical input parameters of the current density, resonator losses, electron pulse length, and desynchronism of the resonator cavity. These power oscillations affect the operation of the FEL requiring better insight into their cause and control. Using simulations based on a self consistent Maxwell Lorentz theory of FEL operation, the dependence of the limit cycle oscillations on these physical parameters is examined.
Type
Thesis
Description
Series/Report No
Department
Physics
Organization
Identifiers
NPS Report Number
Sponsors
Funder
Format
74 p.
Citation
Distribution Statement
Rights
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.