Simulations of the Proposed TJNAF 100KW Free Electron Laser and Comparison with TJNAF Low Power Experiments PDF Download
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Author: Konstantinos Polykandriotis
Publisher:
ISBN: 9781423523505
Category :
Languages : en
Pages : 101
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Book Description
One transitional step for the development of a 1 MW power directed energy weapon is the proposed 100 kW upgrade of the Thomas Jefferson National Accelerator Facility's Free Electron Laser (FEL). To improve the performance of the FEL, the use of the step-taper undulator is explored. Steady-state gain, final steady-state power, and the induced electron spread as a function of desynchronism and taper rates are determined. Comparisons are made to the conventional periodic and linearly tapered undulators. The multimode simulations used showed that the TJNAP 100 kW FEL is feasible. Simulations results with Q = 10 show that the inverse step-taper undulator delta = - pi achieved the highest final power of 190 kW at a desynchronism value of d = 0.01, while maintaining the induced energy spread well below the engineering limit. The validity of our results is verified against experiments conducted in the TJNAF FEL facility. The simulations and the experimental data are in good agreement and consistent with analytic theory.
Author: Konstantinos Polykandriotis
Publisher:
ISBN: 9781423523505
Category :
Languages : en
Pages : 101
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Book Description
One transitional step for the development of a 1 MW power directed energy weapon is the proposed 100 kW upgrade of the Thomas Jefferson National Accelerator Facility's Free Electron Laser (FEL). To improve the performance of the FEL, the use of the step-taper undulator is explored. Steady-state gain, final steady-state power, and the induced electron spread as a function of desynchronism and taper rates are determined. Comparisons are made to the conventional periodic and linearly tapered undulators. The multimode simulations used showed that the TJNAP 100 kW FEL is feasible. Simulations results with Q = 10 show that the inverse step-taper undulator delta = - pi achieved the highest final power of 190 kW at a desynchronism value of d = 0.01, while maintaining the induced energy spread well below the engineering limit. The validity of our results is verified against experiments conducted in the TJNAF FEL facility. The simulations and the experimental data are in good agreement and consistent with analytic theory.
Author: Adamantios Christodoulou
Publisher:
ISBN: 9781423532866
Category :
Languages : en
Pages : 111
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Book Description
The Free Electron Laser (FEL) is a candidate for a future close-in weapon system that will provide a longer protective range for missile destruction. The FEL is also tunable to wavelengths that would give good atmospheric transmission and optimal target absorption characteristics at the target. This thesis describes single-mode and multimode simulation results of the Thomas Jefferson National Accelerator Facility (TJNAF) FEL operating at far infrared wavelengths. The TJNAF FEL uses inverse tapering and is driven by 34.5 MeV and 47.5 MeV energy electron pulses. Steady-state power, weak-field steady state gain, electron beam energy spread and optical spectrum widths were explored as a function of the desyncinonism and tapering rate. The simulations described FEL pulse evolution and short pulse effects. The simulation results have been presented at an International Conference held at Duke University, Durham, NC in August 2000. in addition, the results of damage to Slip-cast Fused Silica samples by the TJNAF FEL, with and without the effect of airflow are analyzed. A comparison with older damage experiments was done in order to develop scaling rules in the future.
Author: Richard B. Steele
Publisher:
ISBN: 9781423560029
Category :
Languages : en
Pages : 71
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Book Description
As the Navy's role as peace enforcer in support of ground troops draws Navy combatants into the littoral warfare environment, surface combatants will have to deal with decreased reaction times while engaging ever faster antiship missile threats. The Phalanx Close In Weapon System (CIWS) does not offer sufficient accuracy or engagement ranges to fight these threats, and conventional chemical lasers, which operate at fixed wavelengths, lack the tunability to operate in a dynamic ocean environment. The Free Electron Laser (FEL) offers the wavelength tunability, fast reaction times, and the pinpoint accuracy necessary to ensure protection of Navy surface combatants into the future. In support of this goal, the Navy is funding a proposed 20 kW FEL at Thomas Jefferson National Accelerator Facility (TJNAF) in Newport News, VA. This FEL will feature a klystron undulator, designed to improve gain in weak optical fields, and a loop that will feed electrons back to the accelerator. Simulations in this thesis vary the dispersive section strengths of the klystron undulator and desynchronism between the optical and electron pulses in order to find dispersive strength and desynchronism values that optimize the effects on final power and weak field gain, while maintaining an electron energy spread less than TJNAF's goal of 6% to ensure proper feedback of electrons to the accelerator. Results show TJNAF's 20 kW FEL design will reach a final power of 19.2 kW with an energy spread of 6% at desynchronism of d=0.03 using a conventional undulator.
Author: R. Eric LeGear
Publisher:
ISBN:
Category :
Languages : en
Pages : 55
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Book Description
The Free Electron Laser (FEL) is a potential solution for the U.S. Navy's anti-ship missile point defense by providing an evolutionary increase in weapon accuracy. To become an effective weapon, the FEL will need to provide an average optical power of approximately one MW. Towards this goal, the Thomas Jefferson National Accelerator Facility (TJNAF) in Newport News, Virginia is constructing the first kW FEL, and desires to improve the design to 20 kW while maintaining less than 6% energy spread. Using a klystron undulator is one potential way to accomplish this. Given design parameters of a proposed free electron laser by TJNAF, this study quantifies via simulation the behaviors of gain, power and energy spread as functions of desynchronism and a klystron's dispersive strength. Specifically, it shows that a conventional undulator appears capable of meeting all TJNAF design requirements.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Book Description
The Free Electron Laser (FEL) is a potential solution for the U.S. Navy's anti-ship missile point defense by providing an evolutionary increase in weapon accuracy. To become an effective weapon, the FEL will need to provide an average optical power of approximately one MW. Towards this goal, the Thomas Jefferson National Accelerator Facility (TJNAF) in Newport News, Virginia is constructing the first kW FEL, and desires to improve the design to 20 kW while maintaining less than 6% energy spread. Using a klystron undulator is one potential way to accomplish this. Given design parameters of a proposed free electron laser by TJNAF, this study quantifies via simulation the behaviors of gain, power and energy spread as functions of desynchronism and a klystron's dispersive strength. Specifically, it shows that a conventional undulator appears capable of meeting all TJNAF design requirements.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 4
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Book Description
The TJNAF Free Electron Laser (FEL) will be upgraded to operate at 10kW average power in the near future. Multimode simulations are used to analyze the operation describing the evolution of short optical pulses in the far infrared wavelength regime. In an FEL that recirculates the electron beam, performance can depend on the electron beam distribution exiting the undulator. The effects of varying the undulator field strength and Rayleigh length of the resonator are explored, as well as the possibility of using an optical klystron. The simulations indicate that the FEL output power can reach the design goal of 10kW.
Author: National Research Council
Publisher: National Academies Press
ISBN: 0309126894
Category : Technology & Engineering
Languages : en
Pages : 66
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Book Description
This book presents a scientific assessment of free-electron-laser technology for naval applications. The charge from the Office of Naval Research was to assess whether the desired performance capabilities are achievable or whether fundamental limitations will prevent them from being realized. The present study identifies the highest-priority scientific and technical issues that must be resolved along the development path to achieve a megawatt-class free-electron laser. In accordance with the charge, the committee considered (and briefly describes) trade-offs between free-electron lasers and other types of lasers and weapon systems to show the advantages free-electron lasers offer over other types of systems for naval applications as well as their drawbacks. The primary advantages of free-electron lasers are associated with their energy delivery at the speed of light, selectable wavelength, and all-electric nature, while the trade-offs for free-electron lasers are their size, complexity, and relative robustness. Also, Despite the significant technical progress made in the development of high-average-power free-electron lasers, difficult technical challenges remain to be addressed in order to advance from present capability to megawatt-class power levels.
Author: Daniel S. Massey
Publisher:
ISBN:
Category :
Languages : en
Pages : 75
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Book Description
The Free Electron Laser, with its wavelength tunability unlike any other laser, may be used in numerous future applications. These applications range from high energy laser weapons to surgical lasers for medical use. This thesis covers three separate topics concerning the FEL: the height of the separatrix for a tapered undulator, use of dimensionless parameters in a simple model and description for several high gain free electron lasers, and simulations of the Darmstadt free electron laser. The first topic yielded a formula for the separatrix height. The second topic utilized data from the proposed LCLS and TESLA x-ray lasers, the Electron Laser Facility at Lawrence Livermore Labs and the Free Electron Laser experiments at the Massachusetts Institute of Technology to develop dimensionless parameters for use in a simple model. For the last topic desynchronism curves for seven tapers were computed and gave expected results.
Author: Dimitrios Lampiris
Publisher:
ISBN: 9781423532385
Category :
Languages : en
Pages : 112
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Book Description
The modern maritime battlefield is dominated by the new generation of sea-skimming, high-speed, stealthy and highly agile anti-ship missiles. Anti- ship cruise missile technology continues to evolve, overcoming the performance of the existing ship self-defense weapon systems. The Free Electron Laser (FEL) could be the ultimate speed-of-light, hard-kill weapon system, offering unique features such as tunability, high power, pinpoint accuracy and infinite magazine. Multimode computer simulations were used to explore the operation of the Thomas Jefferson National Acceleration Facility (TJNAF) FEL with untapered and positively tapered undulator. The final steady-state power, the steady-state gain and the electron energy spread as a function of desynchronism were determined for both 34.5 Mev and 47.5 Mev electron beam energies. This thesis also includes an experimental study of damage induced to Polyimide Fiberglass and F2 Epoxy samples, by the TJNAF FEL. Irradiations of the samples were conducted changing various parameters such as the wavelength, average power, pulse repetition frequency, cross wind and spot size in order to explore the damage mechanism. At this stage of evolution, TJNAF FEL is capable of 500W output average power, and in order to achieve the required intensity of 10 kW/ cm2 the beam was focused to a small radius. Scaling guidelines were developed in order to predict the damage caused by a high power laser over a large area.
Author: Daniel S. Massey
Publisher:
ISBN: 9781423531845
Category :
Languages : en
Pages : 84
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Book Description
The Free Electron Laser, with its wavelength tunability unlike any other laser, may be used in numerous future applications. These applications range from high energy laser weapons to surgical lasers for medical use. This thesis covers three separate topics concerning the FEL: the height of the separatrix for a tapered undulator, use of dimensionless parameters in a simple model and description for several high gain free electron lasers, and simulations of the Darmstadt free electron laser. The first topic yielded a formula for the separatrix height. The second topic utilized data from the proposed LCLS and TESLA x-ray lasers, the Electron Laser Facility at Lawrence Livermore Labs and the Free Electron Laser experiments at the Massachusetts Institute of Technology to develop dimensionless parameters for use in a simple model. For the last topic desynchronism curves for seven tapers were computed and gave expected results.
