Download or read book Simulations of the TJNAF 10kW Free Electron Laser written by and published by . This book was released on 2001 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Simulations of the TJNAF Free Electron Laser with a Negative Taper and Laser Damage Studies written by Adamantios Christodoulou and published by . This book was released on 2000-12-01 with total page 111 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Simulations of the Proposed TJNAF 100KW Free Electron Laser and Comparison with TJNAF Low Power Experiments written by Konstantinos Polykandriotis and published by . This book was released on 2001-12-01 with total page 101 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Free Electron Lasers 2000 written by V.N. Litvinenko and published by Gulf Professional Publishing. This book was released on 2005-12-27 with total page 790 pages. Available in PDF, EPUB and Kindle. Book excerpt: The 22nd International Free Electron Laser Conference and 7th FEL User Workshop were held August 13-18, 2000 at Washington Duke Inn and Golf Club in Durham, North Carolina, USA. The conference and the workshop were hosted by Duke University's Free Electron laser (FEL) Laboratory. Following tradition, the FEL prize award was announced at the banquet. The year 2000 FEL prize was awarded to three scientists propelling the limits of high power FELs: Steven Benson, Eisuke Minehara and George Neill. The conference program was comprised of traditional oral sessions on First Lasing, FEL theory, storage ring FELs, linac and high power FELs, long wavelength FELs, SASE FELs, accelerator and FEL physics and technology, and new developments and proposals. Two sessions on accelerator and FEL physics and technology reflected the emphasis on the high quality of accelerators and components for modern FELs. The breadth of the applications was presented in the workshop oral sessions on materials processing, biomedical and surgical applications, physics and chemistry as well as on instrumentation and methods for FEL applications. A special oral session was dedicated to FEL center status reports for users to learn more about the opportunities with FELs. As usual, the oral sessions were supplemented by poster sessions with in-depth discussions and communications. The FEL physicists and FEL users had excellent opportunities to interact throughout the duration of the event, culminating a Joint Sessions. The year 2000 was very successful being marked by lasing with two SASE and one storage ring short-wavelength FELs, and by the first human surgery with the use of FEL, to mention but a few. The International Program Committee and chairs of the sessions had the challenging and exciting problem of selecting invived and contributed talks for the conferences and the workshop from the influx of abstracts mentioning new results and ideas. The success of the conference was determined by these contributions. Scientists from 15 countries gave 70 talks, presented 176 posters and submitted 146 papers, which are published in the present volume of proceedings.
Download or read book Simulations of the Proposed TJNAF 20 KW Free Electron Laser written by Richard B. Steele and published by . This book was released on 1998-06-01 with total page 71 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Free Electron Lasers 2001 written by M. Brunken and published by Elsevier Science & Technology. This book was released on 2002 with total page 728 pages. Available in PDF, EPUB and Kindle. Book excerpt: The 23 "rd" International Free Electron Laser Conference and the 8 "th" FEL Users Workshop were held on August 20-24 "th" 2001 at the Technische Universitat Darmstadt (TUD) in Germany. This conference is one of a series of FEL conferences administered by an International Executive Committee. It was organized by the Institute of Nuclear Physics of the TUDD at which in 1996 the first free electron laser in Germany went into operation, the super-conducting Darmstadt electron linear accelerator.
Download or read book Simulations of the TJNAF FEL with a Tapered Undulator and Experimental Results of Laser Damage written by Dimitrios Lampiris and published by . This book was released on 2000-12-01 with total page 112 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book PARMELA Based Simulations on Jefferson Lab Free Electron Laser Injector written by Deepesh Kumar Koppunuru and published by . This book was released on 2007 with total page 190 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Simulation of Proposed 20 KW Klystron Free Electron Laser written by R. Eric LeGear and published by . This book was released on 1998 with total page 55 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Simulations of the TJNAF FEL with Tapered and Inversely Tapered Undulators written by and published by . This book was released on 2001 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: Experiments using the TJNAF FEL have explored the operation with both tapered and inversely tapered undulators. We present here numerical simulations using the TJNAF experimental parameters, including the effects of taper. Single-mode simulations show the effect of taper on gain. Multimode simulations describe the evolution of short optical pulses in the far infrared, and show how taper affects single-pass gain and steady-state power as a function of desynchronism. A short optical pulse presents an ever-changing field strength to each section of the electron pulse so that idealized operation is not possible. Yet, advantages for the recirculation of the electron beam can be explored.
Download or read book Principles of Free electron Lasers written by H.P. Freund and published by Springer Science & Business Media. This book was released on 1996-08-31 with total page 586 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is the definitive tutorial text and reference work on free electron lasers. Since the publication of the first edition in 1992 there has been a significant increase both in the number of free-electron lasers in use worldwide, and in the understanding of the various regimes for these devices. In order to maintain the position of this book as the most comprehensive and thorough reference and tutorial in the field, the authors have completely updated the book. In addition to updates and corrections to chapters in the first edition, new chapters have been added.
Download or read book Multimode Simulations of Free Electron Lasers written by Joseph Blau and published by . This book was released on 2002-03-01 with total page 118 pages. Available in PDF, EPUB and Kindle. Book excerpt: The results of theoretical research on Free Electron Lasers (FELs) are presented. Basic FEL physics is reviewed, using a previously developed classical theory. Numerical simulations based on this theory are described, and numerous examples show how they have been used to increase understanding of existing FELs and to help plan new experiments. Single-mode simulations that follow the evolution of a single-frequency plane wave provide insight into important physical effects in FELs. Results show how these simulations are used to evaluate new FEL designs such as inverse-tapered and step-tapered undulators. Longitudinal multimode simulations model plane waves using finite-length electron and optical pulses. These simulations are used to study coherence evolution in various FEL designs, and to explain effects such as limit-cycle behavior. Transverse multimode simulations that allow for the finite transverse dimensions of the optical wavefronts include the effects of optical mode distortion. These simulations are currently being used to design short Rayleigh length optical cavities that are less sensitive to mirror damage. Four- dimensional simulations are also described, which follow the optical wavefront in x, y, z, and t, including the effects of multiple longitudinal and transverse modes. These simulations are computationally intensive, but may play an important role in the design of future high-power FELs.
Download or read book Simulation of DARMSTADT Free Electron Laser and a Comparison of High Gain Free Electron Laser written by Daniel S. Massey and published by . This book was released on 2000 with total page 75 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Simulation of DARMSTADT Free Electron Laser and a Comparison of High Gain Free Electron Lasers written by Daniel S. Massey and published by . This book was released on 2000-12-01 with total page 84 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Free Electron Laser Simulation Techniques written by T. M. Tran and published by . This book was released on 1990 with total page 21 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Theory and Simulation of Free Electron Lasers written by and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Three dimensional Simulations of Free electron Laser Physics written by and published by . This book was released on 1985 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A computer code has been developed to simulate three-dimensional free-electron laser physics. A mathematical formulation of the FEL equations is presented, and the numerical solution of the problem is described. Sample results from the computer code are discussed. 23 refs., 6 figs., 2 tabs.
