FREE ELECTRON LASERS Edited by Sándor Varró Free Electron Lasers Edited by Sándor Varró Published by InTech Janeza Trdine 9, 51000 Rijeka, Croatia Copyright © 2012 InTech All chapters are Open Access distributed under the Creative Commons Attribution 3.0 license, which allows users to download, copy and build upon published articles even for commercial purposes, as long as the author and publisher are properly credited, which ensures maximum dissemination and a wider impact of our publications. After this work has been published by InTech, authors have the right to republish it, in whole or part, in any publication of which they are the author, and to make other personal use of the work. Any republication, referencing or personal use of the work must explicitly identify the original source. As for readers, this license allows users to download, copy and build upon published chapters even for commercial purposes, as long as the author and publisher are properly credited, which ensures maximum dissemination and a wider impact of our publications. Notice Statements and opinions expressed in the chapters are these of the individual contributors and not necessarily those of the editors or publisher. No responsibility is accepted for the accuracy of information contained in the published chapters. The publisher assumes no responsibility for any damage or injury to persons or property arising out of the use of any materials, instructions, methods or ideas contained in the book. Publishing Process Manager Oliver Kurelic Technical Editor Teodora Smiljanic Cover Designer InTech Design Team First published March, 2012 Printed in Croatia A free online edition of this book is available at www.intechopen.com Additional hard copies can be obtained from [email protected] Free Electron Lasers, Edited by Sándor Varró p. cm. ISBN 978-953-51-0279-3 Contents Preface IX Chapter 1 Introduction to the Physics of Free Electron Laser and Comparison with Conventional Laser Sources 1 G. Dattoli, M. Del Franco, M. Labat, P. L. Ottaviani and S. Pagnutti Chapter 2 Design and Simulation Challenges of a Linac-Based Free Electron Laser in the Presence of Collective Effects 39 S. Di Mitri Chapter 3 Hole Coupled Infrared Free-Electron Laser 67 Prazeres Rui Chapter 4 Compact XFEL Schemes 91 Emmanuel d’Humières and Philippe Balcou Chapter 5 Laser-Driven Table-Top X-Ray FEL 119 Kazuhisa Nakajima, Aihua Deng, Hitoshi Yoshitama, Nasr A. M. Hafz, Haiyang Lu, Baifei Shen, Jiansheng Liu, Ruxin Li and Zhizhan Xu Chapter 6 Theoretical Analysis on Smith-Purcell Free-Electron Laser 151 D. Li, M. Hangyo, Y. Tsunawaki, Z. Yang, Y. Wei, S. Miyamoto, M. R. Asakawa and K. Imasaki Chapter 7 Interference Phenomena and Whispering–Gallery Modes of Synchrotron Radiation in a Cylindrical Wave–Guide 175 Sándor Varró Chapter 8 Exotic States of High Density Matter Driven by Intense XUV/X-Ray Free Electron Lasers 187 Frank B. Rosmej VI Contents Chapter 9 Digital RF Control System for the Pulsed Superconducting Linear Accelerator 213 Valeri Ayvazyan Chapter 10 Radiation Safety 229 Yoshihiro Asano Preface The idea of using periodic magnetic fields for properly bending the trajectories of relativistic electrons, and making them generate coherent tunable radiation, appeared as early as the middle of the last century. Further study of this subject, concerning both fundamentals and practice, received a new impetus at the beginning of the seventies. Since then, a huge amount of knowledge has been accumulated in this rapidly developing field of research, creating a new class of lasers, the free electron lasers. This volume consists of a collection of current studies on free electron lasers. Free Electron Lasers covers the analysis of fundamentals and questions of design of these devices functioning from the infrared to ultraviolet or xuv wavelength regimes. In addition to the comparison with conventional lasers, analyses of some related topics concerning near-field and cavity electrodynamics, compact and table-top arrangements and strong radiation–induced exotic states of matter are presented. Digital control and diagnostics of such devices and radiation safety issues are also discussed. Free Electron Lasers provides a selection of research results, from basics to some interesting applications and new ideas of current interest. Sándor Varró Wigner Research Centre for Physics, Hungarian Academy of Sciences, WIGNER RCP, SZFI, Budapest, Hungary