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Title: Simulations of the high average power selene free electron laser prototype. Master's thesis

Abstract

Free electron laser (FEL) technology continues to advance, providing alternative solutions to existing and potential problems. The capabilities of an FEL with respect to tunability, power and efficiency make it an attractive choice when moving into new laser utilization fields. The initial design parameters, for any new system, offer a good base to begin system simulation tests in an effort to determine the best possible design. This is a study of the Novosibirsk design which is a prototype for the proposed SELENE FEL. The design uses a three-section, low-power optical klystron followed by a single-pass, high-power radiator. This system is inherently sensitive to electron beam quality, but affords flexibility in achieving the final design. The performance of the system is studied using the initial parameters. An FEL, configured as a simple, two section optical klystron is studied to determine the basic operating characteristics of a high current FEL klystron.

Authors:
Publication Date:
Research Org.:
Naval Postgraduate School, Monterey, CA (United States)
OSTI Identifier:
7048186
Report Number(s):
AD-A-280780/8/XAB
Resource Type:
Technical Report
Resource Relation:
Other Information: Master's thesis
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; FREE ELECTRON LASERS; DESIGN; OPTICAL PROPERTIES; DIRECTED-ENERGY WEAPONS; KLYSTRONS; ELECTRON TUBES; ELECTRONIC EQUIPMENT; EQUIPMENT; LASERS; MICROWAVE EQUIPMENT; MICROWAVE TUBES; PHYSICAL PROPERTIES; WEAPONS 426002* -- Engineering-- Lasers & Masers-- (1990-)

Citation Formats

Quick, D.D. Simulations of the high average power selene free electron laser prototype. Master's thesis. United States: N. p., 1994. Web.
Quick, D.D. Simulations of the high average power selene free electron laser prototype. Master's thesis. United States.
Quick, D.D. 1994. "Simulations of the high average power selene free electron laser prototype. Master's thesis". United States. doi:.
@article{osti_7048186,
title = {Simulations of the high average power selene free electron laser prototype. Master's thesis},
author = {Quick, D.D.},
abstractNote = {Free electron laser (FEL) technology continues to advance, providing alternative solutions to existing and potential problems. The capabilities of an FEL with respect to tunability, power and efficiency make it an attractive choice when moving into new laser utilization fields. The initial design parameters, for any new system, offer a good base to begin system simulation tests in an effort to determine the best possible design. This is a study of the Novosibirsk design which is a prototype for the proposed SELENE FEL. The design uses a three-section, low-power optical klystron followed by a single-pass, high-power radiator. This system is inherently sensitive to electron beam quality, but affords flexibility in achieving the final design. The performance of the system is studied using the initial parameters. An FEL, configured as a simple, two section optical klystron is studied to determine the basic operating characteristics of a high current FEL klystron.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 1994,
month = 6
}

Technical Report:
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  • Lasers have been incorporated into many parts of society including heavy industrial work military defense, light displays, scientific research, and everyday household appliances. Free Electron Lasers (FELs) use relativistic electrons traveling in an alternating magnetic field to produce coherent radiation. One particular application for a FEL is to beam power to satellites. The United States and Russia have agreed to pursue this effort together. The installation in the United States is the SpacE Laser ENErgy (SELENE) project scheduled for installation at China Lake, California. The SELENE laser system consists of an oscillator and a radiator. The electrons are bunched inmore » the oscillator in preparation for entering the radiator. The use of a three-section optical klystron has been proposed for the SELENE oscillator. An optical klystron FEL is composed of multiple undulator sections, each separated from the next by a dispersive section. The dispersive section allows for larger gain from a shorter total length of undulator. The effects of the optical klystrons in the SELENE oscillator using the proposed SELENE FEL parameters will be investigated through the use of simulations of two and three-section undulators.« less
  • The Paladin FEL experiment is shown to exhibit clear and dramatic effects governed by the electron beam velocity distribution for the first time. The FEL integral equation is used to show that there is significant broadening of the gain spectrum due to the Gaussian velocity distribution, and also shows a plateau in the gain evolution along the undulator due to a triangular-shaped velocity distribution. The gain spectra and power evolution from simple, single-mode simulations are compared to the ELF experiments. The microwave power evolution along the undulator is compared as well for both the tapered and untapered undulators. In allmore » cases, the agreement is found to be good.« less
  • The ELF FEL experiments at LLNL in 1985 provide the first results of a free electron laser (FEL) operating in the high-current, high-gain, high-efficiency regime. Initial experiments measured 15.6dB/m gain at {lambda} {approx} 8mm radiation wavelength. Much of the understanding of the ELF experiment comes from simulations like LLNL's FRED that are run on large CRAY computers. In this brief study, a simpler model is used to explain weak-field gain and saturation. Several physical quantities are expressed in a useful dimensionless form, and serve to relate the ELF FEL to other FEL configurations and to future amplifier designs. The trapped-particlemore » instability is explored for parameters close to the original experiments, and parameters representative of future improvements. 8 refs., 9 figs.« less
  • The modulated beam of the free-electron laser when passed through a thin target should produce strong transition radiation. The measurement of the transition radiation is a direct measurement of the electron-beam modulation in the free-electron laser. A transition radiation experiment using the Stanford MKIII Infrared Free-Electron Laser (IRFEL) has been proposed. The analysis has centered on TRANSPORT, a computer program used for designing charged-particle beam systems. The MKIII IRFEL wiggler exit-bending-magnet system was modeled using TRANSPORT. Analysis reveals that the transverse-emittance and momentum-spread characteristics will cause the modulated beam to demodulate along the path of the central trajectory. A detectormore » location 10 millimeters downstream of the first bending magnet is found suitable for the measurement of the electron beam modulation. For this case the thin foil must be rotated approximately 11.25/sup 0/ about the y axis to yield a minimum effective picobunch extent as seen by the thin foil. Alternate FEL systems are suggested for investigation.« less
  • 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 phasemore » 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. (Author)« less