Download or read book Adapting High Brightness Relativistic Electron Beams for Ultrafast Science written by Cheyne Matthew Scoby and published by . This book was released on 2013 with total page 165 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis explores the use of ultrashort bunches generated by a radiofrequency electron photoinjector driven by a femtosecond laser. Rf photoinjector technology has been developed to generate ultra high brightness beams for advanced accelerators and to drive advanced light source applications. The extremely good quality of the beams generated by this source has played a key role in the development of 4th generation light sources such as the Linac Coherent Light Source, thus opening the way to studies of materials science and biological systems with high temporal and spatial resolution. At the Pegasus Photoinjector Lab, we have developed the application of a BNL/SLAC/UCLA 1.6-cell rf photoinjector as a tool for ultrafast science in its own right. It is the aim of this work to explore the generation of ultrashort electron bunches, give descriptions of the novel ultrafast diagnostics developed to be able to characterize the electron bunch and synchronize it with a pump laser, and share some of the scientific results that were obtained with this technology at the UCLA Pegasus laboratory. This dissertation explains the requirements of the drive laser source and describes the principles of rf photoinjector design and operation necessary to produce electron bunches with an rms longitudinal length

Download or read book Physics And Applications Of High Brightness Electron Beams The Proceedings Of The Icfa Workshop written by James B Rosenzweig and published by World Scientific. This book was released on 2003-12-18 with total page 563 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book contains the contributions to the Workshop on the Physics and Applications of High Brightness Electron Beams, held in July 2002 in Sardinia, Italy. This workshop had a broad international representation from the fields of intense electron sources, free-electron lasers, advanced accelerators, and ultra-fast laser-plasma, beam-plasma and laser-beam physics. The interdisciplinary participants were brought together to discuss advances in the creation and understanding of ultra-fast, ultra-high brightness electron beams, and the unique experimental opportunities in frontier high-energy-density and radiation-source physics which are offered by these scientific tools.The proceedings have been selected for coverage in:• Index to Scientific & Technical Proceedings® (ISTP® / ISI Proceedings)• Index to Scientific & Technical Proceedings (ISTP CDROM version / ISI Proceedings)

Download or read book Research on the Physics of Ultra High Brightness Ultra Relativistic Electron Beams written by and published by . This book was released on 1997 with total page 87 pages. Available in PDF, EPUB and Kindle. Book excerpt: The research supported by this grant has been focused on the physics relevant to the construction and use of state of the art high current, high brightness, ultra-relativistic electron beams in the energy range from 0.25 GeV to 1.1 GeV, namely, the 1 GeV Duke storage ring system. During this period, the Duke storage ring was commissioned and used for: production of coherent Uv radiation (from the OKA XUV EEL); production 0 spontaneous X-ray radiation: and production of a monochromatic gamma ray beam. A number of very successful theoretical results have been developed and tested. Most objectives specified in the proposal have been achieved. A number of initial objectives for the Duke storage ring have been exceeded during the commissioning of the storage ring and its subsystems. This research has led to the creation of a unique facility capable of producing high brightness electron beams with parameters exceeding initial design goals. These beams have been utilized for ground breaking achievements with the OKA FEL system, including the first and only UV FEL in the US and the first and only monochromatic gamma ray beam with tunable energy.

Download or read book High brightness Electron Beams for Production of High Intensity Coherent Radiation for Scientific and Industrial Applications written by and published by . This book was released on 1999 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt: Relativistic electron beams with high six-dimensional phase space densities, i.e., high-brightness beams, are the basis for efficient generation of intense and coherent radiation beams for advanced scientific and industrial applications. The remarkable progress in synchrotrons radiation facilities from the first generation to the current, third-generation capability illustrates this point. With the recent development of the high-brightness electron gun based on laser-driven rf photocathodes, linacs have become another important option for high-brightness electron beams. With linacs of about 100 MeV, megawatt-class infrared free-electron lasers can be designed for industrial applications such as power beaming. With linacs of about 10 GeV, 1-Å x-ray beams with brightness and time resolution exceeding by several orders of magnitude the current synchrotrons radiation sources can be generated based on self-amplified spontaneous emission. Scattering of a high-brightness electron beam by high power laser beams is emerging as a compact method of generating short-pulse, bright x-rays. In the high-energy frontier, photons of TeV quantum energy could be generated by scattering laser beams with TeV electron beams in future linear colliders.

Download or read book The Physics and Applications of High Brightness Electron Beams written by INFN ELOISATRON Project. Workshop and published by World Scientific. This book was released on 2007 with total page 729 pages. Available in PDF, EPUB and Kindle. Book excerpt: These proceedings comprise cutting-edge contributions by researchers at the frontiers of beam physics, free-electron-based light sources, and advanced accelerators. It represents a snap-shot of activity in these fields at a critical historical juncture, where rapid experimental progress is being reported, and new facilities such as X-ray free-electron lasers are under construction. The volume features invited contributions from leading researchers from the international beam physics community that summarize the state-of-the-art research in individual topics, as well as timely contributions from participants that arose during the workshop itself.

Download or read book The Physics and Applications of High Brightness Electron Beams written by Luigi Palumbo and published by World Scientific. This book was released on 2007 with total page 729 pages. Available in PDF, EPUB and Kindle. Book excerpt: These proceedings comprise cutting-edge contributions by researchers at the frontiers of beam physics, free-electron-based light sources, and advanced accelerators. It represents a snap-shot of activity in these fields at a critical historical juncture, where rapid experimental progress is being reported, and new facilities such as X-ray free-electron lasers are under construction. The volume features invited contributions from leading researchers from the international beam physics community that summarize the state-of-the-art research in individual topics, as well as timely contributions from participants that arose during the workshop itself.

Download or read book Accelerator Physics written by Ishaq Ahmad and published by BoD – Books on Demand. This book was released on 2018-02-21 with total page 209 pages. Available in PDF, EPUB and Kindle. Book excerpt: Scientists are continuously improving the accelerator and light source technologies to observe the secret of matter as well as the origin of nature which create new opportunities for accelerator physics research. This book provides a glance view on phase space dynamics of electron beam, motion of relativistic electrons in three-dimensional ideal undulator magnetic field, numerical simulation of electron multi-beam linear accelerator EVT, nuclear safety design of high energy accelerator facilities, and radiation safety aspects of operation of electron linear accelerators. The determination of the structure of biomolecules is presently among the best examples of the application of synchrotron radiation. This book also covers synchrotron-based X-ray diffraction study of mammalian connective tissues and related disease. Furthermore, an overview of the versatile applications of ion beam and synchrotron radiation techniques in hair elemental profiling in biomedical studies is also incorporated in this book.

Download or read book Controlling the Quantum World written by National Research Council and published by National Academies Press. This book was released on 2007-06-21 with total page 245 pages. Available in PDF, EPUB and Kindle. Book excerpt: As part of the Physics 2010 decadal survey project, the Department of Energy and the National Science Foundation requested that the National Research Council assess the opportunities, over roughly the next decade, in atomic, molecular, and optical (AMO) science and technology. In particular, the National Research Council was asked to cover the state of AMO science, emphasizing recent accomplishments and identifying new and compelling scientific questions. Controlling the Quantum World, discusses both the roles and challenges for AMO science in instrumentation; scientific research near absolute zero; development of extremely intense x-ray and laser sources; exploration and control of molecular processes; photonics at the nanoscale level; and development of quantum information technology. This book also offers an assessment of and recommendations about critical issues concerning maintaining U.S. leadership in AMO science and technology.

Download or read book Probing Ultrafast Dynamics With Relativistic Electrons written by David Borden Cesar and published by . This book was released on 2019 with total page 209 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ultrafast science is one of the frontiers of modern physics. It allows us to explore intense, out-of-equilibrium process by manipulating laser pulses shorter than the thermal time-scale of materials. Here we extend that capability to MeV electron beams by using the high extraction field of a radio-frequency photoinjector to generate dense bunches of electrons. This gives us a unique source which we take advantage of to explore two different systems: the first is a photonic structure called a dielectric laser accelerator (DLA), and the second is an accelerator based version of an ultrafast electron microscope (UEM). DLA is an advanced accelerator technology which takes advantage of the high damage threshold of dielectrics (as compared to metals) to sustain GV/m accelerating gradients. It works on the same principle as a conventional RF linac, but it is scaled down 100,000 times from microwave frequencies to optical frequencies. This scaling has important consequences for the beam dynamics of the accelerator, and it leads us to consider a richly nonlinear system in which the stable accelerating region is surrounded by areas of chaos. In order to interrogate the dynamics of this system, we have adapted the beam from an RF photoinjector to fit inside the sub-micron aperture of a DLA. We then perform time-resolved spectroscopic measurements to determine the interaction strength of the accelerator. We record accelerating fields of up to 1.8 GV/m and energy gains as high as 315 keV, but we also find that self-phase modulation can cause dephasing if left uncompensated. Our analysis of the dephasing mechanism, and its compensation, leads us to the design of a DLA with all-optical control of the beam dynamics. MeV UEM is a branch of ultrafast microscopy which is designed to achieve high spatio-temporal resolution in a single-shot. It requires placing billions of electrons inside a small volume of phase space in order to detect contrast from weakly scattering objects. We show that this is possible using relativistic electrons from an RF photoinjector, but because these electrons are stiff we have to replace the conventional microscope optics with strong permanent magnet quadrupole (PMQ) lenses. We have tested these lenses in a two-stage objective-projector setup and measured a total magnification of 900x. When operating this microscope near the design current of 200 mA we observe a strong distortion of the image. Our analysis suggests that the distortion is caused by nonlinear phase-space correlations from the space-charge kick of a Gaussian bunch. We discuss ways to improve the design and obtain 10 nm-10 ps resolution.

Download or read book Electron Microscopy written by Masashi Arita and published by BoD – Books on Demand. This book was released on 2019-10-02 with total page 102 pages. Available in PDF, EPUB and Kindle. Book excerpt: TEM and SEM have contributed greatly to the progress of various research fields, which has been accelerated in the last few decades by highly functional electron microscopes and microscopy. In this tide of microscopy, various microscopic methods have been developed to make clear many unsolved problems, e.g. pulse beam TEM, environmental microscopy, correlative microscopy, etc. In this book, a number of reviews have been collected concerning these subjects. We think that the content in each chapter is impressive, and we hope this book will contribute to future advances in electron microscopy, materials science, and biomedicine.

Download or read book Self consistent Simulation of Radiation and Space charge in High brightness Relativistic Electron Beams written by David R. Gillingham and published by . This book was released on 2007 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Soviet Research on the Transport of Intense Relativistic Electron Beams Through High pressure Air written by Nikita Wells and published by . This book was released on 1987 with total page 100 pages. Available in PDF, EPUB and Kindle. Book excerpt: Soviet research on the propagation of intense relativistic electron beams (IREB) through fairly high-pressure air (pressure range 0.1 to 760 Torr) since the early 1970s has included the study of the plasma channel created by the passage of the electron beam through air, the resistive hose instability and its effect on beam propagation, the effect of self-fields, current enhancement, gas expansion, return currents, inherent beam energy spread, and other factors. This report covers Soviet developments in IREB propagation through air where the beam is not focused by external magnetic fields. The information was obtained from Soviet open-source publications with emphasis given to the last ten years of beam propagation in the Soviet Union. The volume of papers published on this subject in recent years indicates a significant increase in Soviet research in this area.

Download or read book Collective Dynamics of High Brightness Electron Beam Compression and Manipulation written by Jingyi Tang and published by . This book was released on 2022 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: High brightness electron beams have revolutionized accelerator science and enabled a large range of high impact applications such as X-ray free electron lasers(XFEL), inverse Compton-scattering, plasma wakefield accelerators and future linear colliders. In pursue of higher beam brightness, collective effects become key limiting factors. Those collective effects happen during the beam generation, acceleration, compression and transport, including coherent synchrotron radiation, space charge and resistive wall wakefields. As people are entering the new parameter regime -- such as the generation of ultra-short electron bunches or ultra-high peak current -- collective effects can play a dominant role and classical theories of wakefield can break down. In this work we describe our efforts in understanding and controlling the collective dynamics of high-brightness electron beams. In the first half of the thesis, we focus on one of the most challenging beam dynamics problems in accelerator physics -- coherent synchrotron radiation (CSR) and introduce a novel computational model of 2D/3D CSR in relativistic beams. The model achieves both accurate and efficient simulations of CSR in the regime that conventional 1D models become invalid, which can be crucial for the design of next generation accelerators. In the second half, we switch gear to techniques that enable better control of the collective effects. Specifically we examine laser shaping techniques both in spatial and temporal domains as a powerful beam manipulation tool. We first discuss in detail the numerical and experimental studies using Laguerre-Gaussian mode laser in the laser heater to improve the microbunching instability suppression in XFEL drivers. Then we introduce temporal laser shaping to achieve flexible longitudinal phase space manipulation and apply it as an active out-coupling method for cavity-based free-electron lasers.

Download or read book High brightness Electron Beam Evolution in Time Following Laser based Cleaning of the LCLS Cathode written by and published by . This book was released on 2012 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book High brightness Electron Beam Evolution Following Laser based Cleaning of a Photocathode written by and published by . This book was released on 2012 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Creation Transport and Measurement of Bright Relativistic Electron Beams written by Chad Bennett McKee and published by . This book was released on 1994 with total page 472 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Relativistic Electron Beams from Cathodes at 1 GV m Gradient written by and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: In the past decade, there has been extensive research in the development of low emittance, high brightness electron injectors for linear collider and free electron laser applications. RF injectors with a few nC charge in a few ps, with an emittance of[approximately]1--5[pi]mm mrad are operational in a number of facilities. In these devices, a laser beam irradiates a photocathode embedded in an RF cavity. The photoelectrons released by the laser are immediately accelerated to relativistic velocities, thereby reducing the space charge effects. The frequency of the RF and the design of the cavity are chosen to minimize the RF and space charge effects on the electron bunch so that low emittance, high brightness electron beam could be generated. Minimization of RF effects on emittnce growth require a low RF frequency while minimizing the space charge effects require high field and hence high RF frequency. The design is hence a compromise between these two conflicting requirements. Some of these limitations could be overcome by using a large pulsed electric field at the cathode rather than a RF field. The duration of the pulsed field should be chosen so that it is longer than the electron bunch length and the transit time in the accelerating region, but short enough to avoid breakdown problems. Development of a high brightness electron source using this scheme requires a pulse generator, a laser pulse of sufficient energy to trigger and synchronize the electrical pulses, and a short laser pulse to irradiate the photocathode and generate electron pulses to be accelerated. The designs of these components are described.