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Simulations Of The Tjnaf Fel With A Tapered Undulator And Experimental Results Of Laser Damage
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Book Synopsis Simulations of the TJNAF FEL with a Tapered Undulator and Experimental Results of Laser Damage by : Dimitrios Lampiris
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.
Book Synopsis Simulations of the TJNAF Free Electron Laser with a Negative Taper and Laser Damage Studies by : Adamantios Christodoulou
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.
Book Synopsis Simulations of the Proposed TJNAF 100KW Free Electron Laser and Comparison with TJNAF Low Power Experiments by : Konstantinos Polykandriotis
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.
Book Synopsis Simulations of the TJNAF FEL with Tapered and Inversely Tapered Undulators by :
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.
Book Synopsis Experimental Study of the FEL with a Tapered Undulator and Numerical Simulations of Short Pulse Free Electron Lasers by : Sergiy Khodyachykh
Download or read book Experimental Study of the FEL with a Tapered Undulator and Numerical Simulations of Short Pulse Free Electron Lasers written by Sergiy Khodyachykh and published by . This book was released on 2002 with total page 84 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis TJNAF Free Electron Laser Damage Studies by :
Download or read book TJNAF Free Electron Laser Damage Studies written by and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Laser material damage experiments were conducted at the Thomas Jefferson National Accelerator Facility (TJNAF) free electron laser (FEL) user laboratorywith an average power of 100W and a power density of 104W/cm2. The FEL beam bombards the target with a steady stream of tens of millions of pulses persecond each containing 50MW of power in a short burst of ~1ps. No conventional laser combines these characteristics, and no experiments have previouslybeen done to explore the effects of the FEL pulse. The goal is to develop scaling laws to accurately describe large-scale damage from a MW FEL usingsmall-scale experiments.
Book Synopsis Damage Produced by the Free Electron Laser by : Lee R. Short
Download or read book Damage Produced by the Free Electron Laser written by Lee R. Short and published by . This book was released on 1999-06-01 with total page 70 pages. Available in PDF, EPUB and Kindle. Book excerpt: The first damage experiments produced by a Free Electron Laser were conducted at the Department of Energy's Thomas Jefferson National Accelerator Facility (TJNAF). In the past, only large scale laser experiments were thought to properly model lasers for weapons applications. Scaled down procedures developed in this thesis allowed the FEL, with a few hundred watts of power, to characterize the damage produced by a megawatt weapon's scale laser. With a power density of 10 kW/cm2, the TJNAF FEL bombards targets with a steady stream of tens of millions of pulses per second. Each pulse contains 50 MW of power in short bursts lasting 4 x 10.14 seconds each. No previous laser experiments have been conducted to explore the effects of the FEL short pulses. Target materials were obtained from the Naval Surface Warfare Center (NSWC), Port Hueneme. Data were collected and analyzed using video cameras and optical microscopes, and irradiated at TJNAF. This thesis was a productive cooperation between NPS, TJNAF, and NSWC Port Hueneme, to the benefit of DOD.
Book Synopsis Simulations of the Proposed TJNAF 20 KW Free Electron Laser by : Richard B. Steele
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.
Book Synopsis Simulations of the TJNAF 10kW Free Electron Laser by :
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.
Book Synopsis Simulation of a High-gain Tapered-wiggler Free-electron Laser by :
Download or read book Simulation of a High-gain Tapered-wiggler Free-electron Laser written by and published by . This book was released on 1983 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We present results from a numerical model of a high-gain (electron-beam power> input laser beam power) FEL amplifier.
Book Synopsis Theory and Design of Charged Particle Beams by : Martin Reiser
Download or read book Theory and Design of Charged Particle Beams written by Martin Reiser and published by John Wiley & Sons. This book was released on 2008-09-26 with total page 634 pages. Available in PDF, EPUB and Kindle. Book excerpt: Although particle accelerators are the book's main thrust, it offers a broad synoptic description of beams which applies to a wide range of other devices such as low-energy focusing and transport systems and high-power microwave sources. Develops material from first principles, basic equations and theorems in a systematic way. Assumptions and approximations are clearly indicated. Discusses underlying physics and validity of theoretical relationships, design formulas and scaling laws. Features a significant amount of recent work including image effects and the Boltzmann line charge density profiles in bunched beams.
Book Synopsis Atlas of Pathological Computer Tomography by : A. L. Baert
Download or read book Atlas of Pathological Computer Tomography written by A. L. Baert and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 417 pages. Available in PDF, EPUB and Kindle. Book excerpt: It was our aim to place at the disposal of radiologists within a short time an atlas of high-quality, valuable pictures of abdominal CT without We felt that, the image degradation inherent to slower scanning apparatus. notwithstanding rapid evolution in CT scanning apparatus and the resulting rapid advances in our clinical knowledge about the value, limitations and applications of this new diagnostic imaging modality, an effort should be made to realize an atlas of reference. From more than 7,000 patients studied with abdominal CT, we tried to assemble images with maximal anatomical detail, which implies the use of large window settings, being well aware that in daily routine practice basic CT methodology includes the use of different window settings for optimal information. It was, however, a conscious decision not to use comparative images with large and small window settings in order to stay within a reasonable total number of figures. Much emphasis has been placed upon the use of contrast enhancement by intravenous contrast media. This is based on the conviction that essen tially new and better morphological information about normal and pathological processes within the abdomen can be obtained because short exposure times now allow one to capture the rapidly changing aspect and degree of contrast enhancement of the lesions as a function of their vascu larity.
Author :Stuart K. Tewksbury Publisher :Institute of Electrical & Electronics Engineers(IEEE) ISBN 13 : Total Pages :536 pages Book Rating :4.E/5 ( download)
Book Synopsis Microelectronic System Interconnections by : Stuart K. Tewksbury
Download or read book Microelectronic System Interconnections written by Stuart K. Tewksbury and published by Institute of Electrical & Electronics Engineers(IEEE). This book was released on 1994 with total page 536 pages. Available in PDF, EPUB and Kindle. Book excerpt: Microelectronic system interconnections provides a uniques approach to the subject.
Download or read book Lasers written by A. E. Siegman and published by University Science Books. This book was released on 1986 with total page 1322 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is both a textbook and general reference on the subject of laser theory and basic laser principles. The book gives a detailed accurate treatment of laser physics which does not require a background in quantum mechanics.
Book Synopsis Fundamentals of Beam Physics by : Jamie Rosenzweig
Download or read book Fundamentals of Beam Physics written by Jamie Rosenzweig and published by . This book was released on 2003 with total page 294 pages. Available in PDF, EPUB and Kindle. Book excerpt: This text presents beam physics using a unified approach emphasizing basic concepts and analysis methods. Beyond single particle dynamics, the proliferation of commonly used beam descriptions are surveyed and compared. Aspects of experimental techniques are introduced.
Book Synopsis Magnetism in Condensed Matter by : Stephen Blundell
Download or read book Magnetism in Condensed Matter written by Stephen Blundell and published by OUP Oxford. This book was released on 2001-10-05 with total page 272 pages. Available in PDF, EPUB and Kindle. Book excerpt: An understanding of the quantum mechanical nature of magnetism has led to the development of new magnetic materials which are used as permanent magnets, sensors, and information storage. Behind these practical applications lie a range of fundamental ideas, including symmetry breaking, order parameters, excitations, frustration, and reduced dimensionality. This superb new textbook presents a logical account of these ideas, staring from basic concepts in electromagnetsim and quantum mechanics. It outlines the origin of magnetic moments in atoms and how these moments can be affected by their local environment inside a crystal. The different types of interactions which can be present between magnetic moments are described. The final chapters of the book are devoted to the magnetic properties of metals, and to the complex behaviour which can occur when competing magnetic interactions are present and/or the system has a reduced dimensionality. Throughout the text, the theorectical principles are applied to real systems. There is substantial discussion of experimental techniques and current reserach topics. The book is copiously illustrated and contains detailed appendices which cover the fundamental principles.
Book Synopsis HIE-ISOLDE: the Technical Options by : European Organization for Nuclear Research
Download or read book HIE-ISOLDE: the Technical Options written by European Organization for Nuclear Research and published by . This book was released on 2006 with total page 116 pages. Available in PDF, EPUB and Kindle. Book excerpt:
