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Eigenmode Analysis Of A High Gain Free Electron Laser Based On A Transverse Gradient Undulator
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Book Synopsis Eigenmode Analysis of a High-gain Free-electron Laser Based on a Transverse Gradient Undulator by :
Download or read book Eigenmode Analysis of a High-gain Free-electron Laser Based on a Transverse Gradient Undulator written by and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Here, the use of a transverse gradient undulator (TGU) is viewed as an attractive option for free-electron lasers (FELs) driven by beams with a large energy spread. By suitably dispersing the electron beam and tilting the undulator poles, the energy spread effect can be substantially mitigated. However, adding the dispersion typically leads to electron beams with large aspect ratios. As a result, the presence of higher-order modes in the FEL radiation can become significant. To investigate this effect, we study the eigenmode properties of a TGU-based, high-gain FEL, using both an analytically-solvable model and a variational technique. Our analysis, which includes the fundamental and the higher-order FEL eigenmodes, can provide an estimate of the mode content for the output radiation. This formalism also enables us to study the trade-off between FEL gain and transverse coherence. Numerical results are presented for a representative soft X-ray, TGU FEL example.
Book Synopsis Theoretical Study of Novel Concepts for Compact, High-gain Free Electron Lasers by : Panagiotis Baxevanis
Download or read book Theoretical Study of Novel Concepts for Compact, High-gain Free Electron Lasers written by Panagiotis Baxevanis and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: In recent years, the free-electron laser (FEL) has demonstrated its value as a tunable source of bright, coherent radiation with photon energies up to the X-ray region. For such short radiation wavelengths, three-dimensional (3D) effects (due to diffraction, emittance and focusing) become significant and must be taken into consideration. In this work, we present a systematic, fully 3D theoretical formalism applicable to a range of concepts for compact, high-gain FELs. These include novel schemes involving the use of transverse gradient (TGU) or laser undulators. Our approach utilizes either a standard eigenmode analysis for constant-parameter systems or a non-eigenmode expansion technique in terms of orthogonal transverse modes for cases where the parameters of the electron beam and/or the undulator vary along the longitudinal direction. The results we obtain fully characterize the system (electron beam and radiation) in the linear regime of the interaction and are shown to be in excellent agreement with simulation. Moreover, the formalism developed here can be used in comprehensive, theory-based optimization studies, with significant applications in FEL design.
Book Synopsis Synchrotron Radiation and Free-Electron Lasers by : Kwang-Je Kim
Download or read book Synchrotron Radiation and Free-Electron Lasers written by Kwang-Je Kim and published by Cambridge University Press. This book was released on 2017-03-23 with total page 299 pages. Available in PDF, EPUB and Kindle. Book excerpt: Learn about the latest advances in high-brightness X-ray physics and technology with this authoritative text. Drawing upon the most recent theoretical developments, pre-eminent leaders in the field guide readers through the fundamental principles and techniques of high-brightness X-ray generation from both synchrotron and free-electron laser sources. A wide range of topics is covered, including high-brightness synchrotron radiation from undulators, self-amplified spontaneous emission, seeded high-gain amplifiers with harmonic generation, ultra-short pulses, tapering for higher power, free-electron laser oscillators, and X-ray oscillator and amplifier configuration. Novel mathematical approaches and numerous figures accompanied by intuitive explanations enable easy understanding of key concepts, whilst practical considerations of performance-improving techniques and discussion of recent experimental results provide the tools and knowledge needed to address current research problems in the field. This is a comprehensive resource for graduate students, researchers and practitioners who design, manage or use X-ray facilities.
Book Synopsis High Gain, High Power Free Electron Laser: Physics and Application to TeV Particle Acceleration by : R. Bonifacio
Download or read book High Gain, High Power Free Electron Laser: Physics and Application to TeV Particle Acceleration written by R. Bonifacio and published by Elsevier. This book was released on 2012-12-02 with total page 326 pages. Available in PDF, EPUB and Kindle. Book excerpt: During the past few years the physics and technology of charged particle beams on which electron-positron linear colliders in the TeV region, storage rings from synchrotron radiation sources and Free Electron Lasers are based, has seen a remarkable development. The purpose of this series of schools is to address the physics and technology issues of this field, train young people and at the same time provide a forum for discussions on recent advances for scientists active in this field. The subjects chosen for this first course reflect the recent interest in TeV electron positron colliders, the possibility offered by Free Electron Lasers to power them and the developments in the production of high brightness electron beams.
Book Synopsis Lectures On The Free Electron Laser Theory And Related Topics by : Giuseppe Dattoli
Download or read book Lectures On The Free Electron Laser Theory And Related Topics written by Giuseppe Dattoli and published by World Scientific. This book was released on 1993-02-03 with total page 666 pages. Available in PDF, EPUB and Kindle. Book excerpt: Contents:Electron Beam OpticsSynchrotron Radiation: A Short DescriptionSynchrotron Radiation: Emission in Undulator MagnetsAccelerators with Radiative DumpingFree Electron Laser: An IntroductionFEL Pendulum EquationUndulator FEL DynamicsFEL Integral EquationMiscellaneous Considerations on the FEL Gain and the High-Gain LimitA Qualitative Description of Storage-Ring FEL Dynamics and Longitudinal Mode Coupling Readership: Laser physicists. keywords:Free Electron Laser;Laser;Linac;Microtron;Storage Ring;Synchrotron Radiation;Undulators;Wigglers;Bending Magnets;Coherent Radiation Sources;Beam Optics;Colson Equation;Electron Beam Transport;FEL Pendulum Equation;Gain Curve;High Gain Regime;Saturation;Small Gain Regime;Transport Channel;Magnetic Undulator
Book Synopsis Theoretical and Experimental Studies on Novel High-Gain Seeded Free-Electron Laser Schemes by : Chao Feng
Download or read book Theoretical and Experimental Studies on Novel High-Gain Seeded Free-Electron Laser Schemes written by Chao Feng and published by Springer. This book was released on 2015-12-18 with total page 118 pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation focuses on the study of novel high-gain free-electron laser (FEL) operation schemes with external seed lasers. The technique of manipulating the phase space of the electron beam, which is widely used in novel seeded FEL schemes, is systematically studied. Several novel FEL schemes are proposed for the generation of intense coherent FEL pulses with short wavelength, sub-femtosecond pulse length or multiple carrier frequency properties, which meet the needs of FEL users. Results of experiments are described for the recently proposed FEL schemes such as echo-enabled harmonic generation and cascaded high-gain harmonic generation. New photon/electron beam diagnostic methods are also developed for these experiments and future high-gain FEL facilities.
Book Synopsis Exact and Variational Solutions of 3D Eigenmodes in High Gain FELs [Exact and Variational Solutions of 3D Eigenmodes in High Gain Free Electron Lasers]. by :
Download or read book Exact and Variational Solutions of 3D Eigenmodes in High Gain FELs [Exact and Variational Solutions of 3D Eigenmodes in High Gain Free Electron Lasers]. written by and published by . This book was released on 2000 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt: Exact solution and variational approximation of eigenmodes in high gain FELs are presented. These eigenmodes specify transverse profiles and exponential growth rates of the laser field before saturation. They are self-consistent solutions of coupled Maxwell-Vlasov equations describing FEL interaction taking into account the effects due to energy spread, emittance and betatron oscillations of the electron beam, as well as diffraction and optical guiding of the laser field. A new formalism of scaling is introduced and based on which solutions in various limiting cases are discussed. Additionally, a fitting formula is obtained from interpolating the variational solution for quick calculation of exponential growth rate of the fundamental mode.
Book Synopsis Principles of Free-electron Lasers by : H.P. Freund
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.
Book Synopsis The Physics of Free Electron Lasers by : E.L. Saldin
Download or read book The Physics of Free Electron Lasers written by E.L. Saldin and published by Springer Science & Business Media. This book was released on 2013-03-09 with total page 470 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Free Electron Laser (FEL) will be a crucial tool for research and industrial applications. This book describes the physical fundamentals of FELs on the basis of classical mechanics, electrodynamics, and the kinetic theory of charged particle beams, and will be suitable for graduate students and scientists alike. After a short introduction, the book discusses the theory of the FEL amplifier and oscillator, diffraction effects in the amplifier, and waveguide FEL.
Book Synopsis Development and Applications of Free Electron Lasers by : Jia Chen
Download or read book Development and Applications of Free Electron Lasers written by Jia Chen and published by CRC Press. This book was released on 1997-05-22 with total page 176 pages. Available in PDF, EPUB and Kindle. Book excerpt: Provides a comprehensive overview of the field of free electron lasers. Each chapter is based on a graduate-level lecture given by an internationally-known expert in the field, and is self-contained, beginning with introductory background material and culminating in an in-depth discussion of the author's current research. Written with both the student physicist and the active researcher in mind, this book is sure to be an invaluable reference for graduate students and professionals alike.
Book Synopsis Free Electron Lasers by : S. Martellucci
Download or read book Free Electron Lasers written by S. Martellucci and published by Springer Science & Business Media. This book was released on 2013-03-09 with total page 698 pages. Available in PDF, EPUB and Kindle. Book excerpt: The volume contains the proceedings of the 7th Course on Physics and Technology of Free Electron Lasers of the International School of Quantum Electronics, which was held in Erice (Italy) from 17 to 29 August 1980, under the auspices of the "Ettore Majorana" Centre for Scientific Culture. The level of this Course was much closer to a workshop than to a school, and "Advances in Free Electron Lasers" might have been an appropriate title. Many of the world's leading scientists in the field (among them, the inventor of FEL, J. M. J. Madey) were brought together to review the accomplishments of FEL experiments, as well various trends in FEL theory. In editing this material we did not modify the original manu scripts except to assist in uniformity of style. The papers. are presented without reference to the chronology of the Course but in the following topical arrangement: A. "Fundamentals of free electron lasers," a group of tutorial papers; B. "Free electron lasers operating in the Compton regime," where theories and experiments of FELs based on Compton scattering are reviewed; C. "Free electron lasers operating in the Raman regime," a dis cussion of FELs based on Raman scattering; D. "Optical klystrons," where the possibility of this class of FEL is discussed from a theoretical viewpoint; E.
Book Synopsis High Efficiency, High Brightness X-ray Free Electron Laser Pulses Via Fresh Bunch Self-seeding and Undulator Tapering by : CLAUDIO EMMA
Download or read book High Efficiency, High Brightness X-ray Free Electron Laser Pulses Via Fresh Bunch Self-seeding and Undulator Tapering written by CLAUDIO EMMA and published by . This book was released on 2017 with total page 193 pages. Available in PDF, EPUB and Kindle. Book excerpt: The advent of the X-ray Free Electron Laser (XFEL) as the world's brightest light source has opened the door to the study of natural phenomena occurring on Angstrom level spatial scales and femtosecond time intervals. After more than five years of successful operation, there is a demand from the scientific community to further increase the brightness and peak power one hundred times more than the state-of-the art to reach TW power X-ray pulses in the next generation of XFELs. The central subject of this dissertation is the study of strategies to achieve high efficiency, high power XFEL pulses via optimized undulator tapering and the novel technique of fresh bunch self-seeding which we demonstrate experimentally in this work. Our work begins with theoretical and numerical investigations of high efficiency XFELs in which we determine the primary factors which prevent the efficiency from reaching values on the order of 10 %, which correspond to TW-power pulses. The initial studies focus on the dependence of the peak power of a TW-level self-seeded tapered XFEL on the transverse electron distribution. We show via numerical simulations that more uniform transverse distributions (parabolic or flat) can increase the efficiency compared to transversely Gaussian beams from 2.8 % to 4.8 %, corresponding to an increase in peak power from 1.6 TW to 2.6 TW in a 200 m undulator. These numerical studies emphasize the contribution of two physical phenomena, diffraction and the synchrotron sideband instability, as the primary obstacles to reaching TW peak power in a compact undulator system. To circumvent these issues we propose two improvements for high extraction efficiency tapered XFELs: a new development in FEL hardware through the proposal of an Advanced Gradient Undulator (AGU), and a new technique for the efficient generation of high power XFEL radiation which we name fresh bunch self-seeding. We analyze in detail the performance of a high efficiency AGU by carrying out the first dedicated comparative numerical optimization study of a tapered FEL including and intentionally disabling time dependent effects. Combining the AGU design with an optimized undulator taper and a fresh bunch self-seeded system yields a peak efficiency in simulation of 12 % with 6.3 TW of peak power in a 100 m undulator. Following the numerical and theoretical studies of tapered XFELs, the remainder of the work describes the first experimental demonstration of fresh bunch self seeding in an XFEL. With this scheme we are able to generate high power (50 GW) narrow bandwidth ($\delta \omega/\omega_0=8\times 10^{-5}$) short X-ray pulses ($\delta t
Book Synopsis EIGENMODE ANALYSIS OF OPTICAL GUIDING IN FREE ELECTRON LASERS. by :
Download or read book EIGENMODE ANALYSIS OF OPTICAL GUIDING IN FREE ELECTRON LASERS. written by and published by . This book was released on 1989 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The spatial properties of the optical field and hence the performance of a free electron laser depend on the fact that the electron beam, which acts as both an amplifying and a refractive medium, is transversely nonuniform. Under certain circumstances, optical guiding may be realized, where the optical field is stably confined near the electron beam and amplified along the beam over many Rayleigh ranges. We show that the three-dimensional evolution of the optical field through the interaction region can be determined by a guided mode expansion before saturation. Optical guiding occurs when the fundamental growing mode becomes dominant. The guided mode expansion is made possible by implementing the biorthogonality of the eigenmodes of the coupled electron-beam-optical-wave system. The eigenmodes are found to be of vectorial form with three components; one specifies the guided optical mode and the other two describe the density and the energy modulations of the electron beam.
Book Synopsis Theoretical Analysis of a Laser Undulator-Based High-Gain FEL. by :
Download or read book Theoretical Analysis of a Laser Undulator-Based High-Gain FEL. written by and published by . This book was released on 2014 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Studies on Experiments and free-electron laser concepts with a transverse gradient undulator by : Farzad Jafarinia
Download or read book Studies on Experiments and free-electron laser concepts with a transverse gradient undulator written by Farzad Jafarinia and published by . This book was released on 2021 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Undulators and Free-Electron Lasers by : P. Luchini
Download or read book Undulators and Free-Electron Lasers written by P. Luchini and published by . This book was released on 1990-07-19 with total page 346 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is a reference text for all those working in free-electron laser research as well as being a learning aid for physicists and graduate students who wish an introduction to this field. Only a basic understanding of relativistic mechanics and electromagnetism is presupposed. After an overview of early developments and general principles of operation, the different models that can be used to describe free-electron lasers are presented, organized according to their range of applicability. The relevent conceptual and mathematical constructs are built up from first principles with attention to obtaining the practically important results in a simple but rigorous way. Interaction of the undulator with the driving electron accelerator and the laser cavity and design of undulator magnets are treated and an overview is given of some typical experiments.
Book Synopsis Towards Compact and Advanced Free Electron Laser by : Amin Ghaith
Download or read book Towards Compact and Advanced Free Electron Laser written by Amin Ghaith and published by . This book was released on 2019 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: X-ray Free Electron Lasers (FEL) are nowadays unique intense coherent fs light sources used for multi-disciplinary investigations of matter. A new acceleration scheme such as Laser Plasma Accelerator (LPA) is now capable of producing an accelerating gradient of few GeV/cm far superior to that of conventional RF linacs. This PhD work has been conducted in the framework of R&D programs of the LUNEX5 (free electron Laser Using a New accelerator for the Exploitation of X-ray radiation of 5th generation) project of advanced and compact Free Electron laser demonstrator with pilot user applications. It comprises a 400 MeV superconducting linac for studies of advanced FEL schemes, high repetition rate operation (10 kHz), multi-FEL lines, a Laser Wake Field Accelerator (LWFA) for its qualification by a FEL application. The FEL lines comports enables advanced seeding in the 40-4 nm spectral range using high gain harmonic generation (HGHG) and echo-enabled harmonic generation (EEHG) with compact short period high field cryogenic undulators. The study of compact devices suitable for compact FEL applications is thus examined. One first aspect concerns the reduction of the Free Electron Laser gain medium (electrons in undulator) where shortening of the period is on the expense of the magnetic field leading to an intensity reduction at high harmonics. Compact cryogenic permanent magnet based undulators (CPMUs), where the magnet performance is increased at cryogenic temperature making them suitable for compact applications, are studied. Three CPMUs of period 18 mm have been built: two are installed at SOLEIL storage ring and one at COXINEL experiment. A second part of the work is developed in the frame of the R&D programs is the COXINEL experiment with an aim at demonstrating FEL amplification using an LPA source. The line enables to manipulate the properties of the produced electron beams (as energy spread, divergence, induced dispersion due) before being used for light source applications. The electron beam generated is highly divergent and requires a good handling at an early stage with strong quadrupoles, to be installed immediately after the electron generation source. Hence, the development of the so-called QUAPEVAs, innovative permanent magnet quadrupoles with high tunable gradient, is presented. The QUAPEVAs are optimized with RADIA code and characterized with three magnetic measurements. High tunable gradient is achieved while maintaining a rather good magnetic center excursion that allowed for beam pointing alignment compensation at COXINEL, where the beam is well-focused with zero dispersion at any location along the line. The QUAPEVAs constitute original systems in the landscape of variable high gradient quadrupoles developed so far. A third part of the work concerns the observation of tunable monochromatic undulator radiation on the COXINEL line. The electron beam of energy of 170 MeV is transported and focused in a 2-m long CPMU with a period of 18 mm emitting radiation light at 200 nm. The spectral flux is characterized using a UV spectrometer and the angular flux is captured by a CCD camera. The wavelength is tuned with the undulator gap variation. The spatio-spectral moon shape type pattern of the undulator radiation provided an insight on the electron beam quality and its transport enabling the estimation of the electron beam parameters such as energy spread and divergence. The final aspect of the work is related to the comparison between the echo and high gain harmonic generation, in the frame of my participation to an experiment carried out at FERMI@ELETTRA. At FERMI, we have demonstrated a high gain lasing using EEHG at a wavelength of 5.9 nm where it showed a narrower spectra and better reproducibility compared to a two-stage HGHG. This PhD work constitutes a step forward towards advanced compact Free Electron Lasers.
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