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Author: Publisher: ISBN: Category : Languages : en Pages :
Book Description
A design of a compact free-electron laser (FEL), generating ultra-fast, high-peak flux, XUV pulses is presented. The FEL is driven by ahigh-current, 0.5 GeV electron beam from the Lawrence Berkeley National Laboratory (LBNL) laser-plasma accelerator, whose active acceleration length is only a few centimeters. The proposed ultra-fast source (~;;10 fs) would be intrinsically temporally synchronized to the drive laser pulse, enabling pump-probe studies in ultra-fast science. Owing to the high current (>10 kA) of the laser-plasma-accelerated electron beams, saturated output fluxes are potentially greater than 10^13 photons/pulse. Devices based both on self-amplified spontaneous emission and high-harmonic generated input seeds, to reduce undulator length and fluctuations, are considered.
Author: Publisher: ISBN: Category : Languages : en Pages :
Book Description
A design of a compact free-electron laser (FEL), generating ultra-fast, high-peak flux, XUV pulses is presented. The FEL is driven by ahigh-current, 0.5 GeV electron beam from the Lawrence Berkeley National Laboratory (LBNL) laser-plasma accelerator, whose active acceleration length is only a few centimeters. The proposed ultra-fast source (~;;10 fs) would be intrinsically temporally synchronized to the drive laser pulse, enabling pump-probe studies in ultra-fast science. Owing to the high current (>10 kA) of the laser-plasma-accelerated electron beams, saturated output fluxes are potentially greater than 10^13 photons/pulse. Devices based both on self-amplified spontaneous emission and high-harmonic generated input seeds, to reduce undulator length and fluctuations, are considered.
Author: Publisher: ISBN: Category : Languages : en Pages :
Book Description
We discuss the design and current status of a compactfree-electron laser (FEL), generating ultra-fast, high-peak flux, VUVpulses driven by a high-current, GeV electron beam from the existingLawrence Berkeley National Laboratory (LBNL) laser-plasma accelerator, whose active acceleration length is only a few cm. The proposedultra-fast source would be intrinsically temporally synchronized to thedrive laser pulse, enabling pump-probe studies in ultra-fast science withpulse lengths of tens of fs. Owing to the high current (& 10 kA) ofthe laser-plasma-accelerated electron beams, saturated output fluxes arepotentially greater than 1013 photons/pulse. Devices based both on SASEand high-harmonic generated input seeds, to reduce undulator length andfluctuations, are considered.
Author: Publisher: ISBN: Category : Languages : en Pages :
Book Description
A free electron laser (FEL) uses an undulator, a set of alternating magnets producing a periodic magnetic fi eld, to stimulate emission of coherent radiation from a relativistic electron beam. The Lasers, Optical Accelerator Systems Integrated Studies (LOASIS) group at Lawrence Berkeley National Laboratory (LBNL) will use an innovative laserplasma wakefi eld accelerator to produce an electron beam to drive a proposed FEL. In order to optimize the FEL performance, the dependence on electron beam and undulator parameters must be understood. Numerical modeling of the FEL using the simulation code GINGER predicts the experimental results for given input parameters. Among the parameters studied were electron beam energy spread, emittance, and mismatch with the undulator focusing. Vacuum-chamber wakefi elds were also simulated to study their effect on FEL performance. Energy spread was found to be the most infl uential factor, with output FEL radiation power sharply decreasing for relative energy spreads greater than 0.33%. Vacuum chamber wakefi elds and beam mismatch had little effect on the simulated LOASIS FEL at the currents considered. This study concludes that continued improvement of the laser-plasma wakefi eld accelerator electron beam will allow the LOASIS FEL to operate in an optimal regime, producing high-quality XUV and x-ray pulses.
Author: Nathan Majernik Publisher: ISBN: Category : Languages : en Pages : 168
Book Description
The free electron laser (FEL) is the brightest available source of x-rays, surpassing other options by more than ten orders of magnitude. The FEL's short ($\sim$femtosecond), high power ($\sim$gigawatt), coherent x-ray pulses are uniquely capable of probing ultrafast and ultrasmall atomic and molecular dynamics and structure, making them an invaluable research tool for biology, chemistry, material science, physics, medicine, and other fields. Unfortunately, all extant x-ray FELs rely on long rf linacs and undulators, with a footprint of kilometers and a cost on the order of a billion dollars. This severely limits the number of x-ray FELs, with the half dozen existing installations funded at the nation state level. These facilities are significantly oversubscribed, to the detriment of scientific and technological progress. Therefore, attempts to reduce the size and cost of FELs are an active area of research in an effort to increase access to these powerful research tools, with the goal of making x-ray FELs affordable to universities and companies. One of the approaches being researched is the laser plasma accelerator (LPA). The LPA uses an ultra-high intensity laser to eject plasma electrons from a bubble region, producing longitudinal accelerating fields more than three orders of magnitude higher than what can be achieved in an rf linac. In principle, this could shrink the FEL accelerating section from the kilometer scale to a tabletop. To date though, despite continual progress and refinement over the last decade, LPA beam quality has not yet reached the level where it can be directly used as an FEL driver due to stringent constraints on the lasing dynamics. The BELLA FEL experiment at Lawrence Berkeley National Lab intends to decompress the beam to skirt some of the beam quality requirements, by stretching the beam longitudinally and reducing local energy spread. This dissertation will discuss the design and implementation of two subsystems essential for the successful operation of this experiment. The first of these is a coherent transition radiation bunch length diagnostic, which is required to measure the length of the LPA bunches and extrapolate other details about the experiment's performance. The second is an electromagnetic chicane which performs the decompression of the electron beam. A final chapter explores the use of advanced undulators to enable the next generation of LPA driven FELs without decompression and discusses methods for realizing such undulators.
Author: National Research Council Publisher: National Academies Press ISBN: 0309126894 Category : Technology & Engineering Languages : en Pages : 66
Book Description
This book presents a scientific assessment of free-electron-laser technology for naval applications. The charge from the Office of Naval Research was to assess whether the desired performance capabilities are achievable or whether fundamental limitations will prevent them from being realized. The present study identifies the highest-priority scientific and technical issues that must be resolved along the development path to achieve a megawatt-class free-electron laser. In accordance with the charge, the committee considered (and briefly describes) trade-offs between free-electron lasers and other types of lasers and weapon systems to show the advantages free-electron lasers offer over other types of systems for naval applications as well as their drawbacks. The primary advantages of free-electron lasers are associated with their energy delivery at the speed of light, selectable wavelength, and all-electric nature, while the trade-offs for free-electron lasers are their size, complexity, and relative robustness. Also, Despite the significant technical progress made in the development of high-average-power free-electron lasers, difficult technical challenges remain to be addressed in order to advance from present capability to megawatt-class power levels.
Author: Publisher: ISBN: Category : Languages : en Pages : 13
Book Description
An infrared free electron laser (IRFEL) is being designed for the Chemical Dynamics Research Laboratory (CDRL) at LBL. The FEL is based on a 50 MeV RF linac operating in synchronization to the Advanced Light Source (ALS), and will produce intense (100 [mu]J per micropulse), narrow bandwidth (narrower than 0.1%) radiation between 3 [mu] and 50 [mu]. In the design, we pay particular attention to the FEL stability issues and require that the fluctuations in electron beam energy and in timing be less then 0.05% and 0.1 ps respectively. The FEL spectrum can then be stabilized to about 10−3, or if grating is used, to 10−4. We discuss various sources of fluctuations in the gun, the bunchers and the accelerator sections, as well as the feedback and feedforward schemes to reduce these fluctuations. The accelerator structure is chosen to be of the side coupled, standing wave type for easier control. The beam transport is made isochronous to avoid the coupling between the energy and the timing fluctuations. 12 refs., 1 fig.
Author: H. P. Freund Publisher: Springer ISBN: 9789401050234 Category : Science Languages : en Pages : 460
Book Description
At the time that we decided to begin work on this book, several other volumes on the free-electron laser had either been published or were in press. The earliest work of which we were aware was published in 1985 by Dr T. C. Marshall of Columbia University [1]. This book dealt with the full range of research on free-electron lasers, including an overview of the extant experiments. However, the field has matured a great deal since that time and, in our judgement, the time was ripe for a more extensive work which includes the most recent advances in the field. The fundamental work in this field has largely been approached from two distinct and, unfortunately, separate viewpoints. On the one hand, free-electron lasers at sub-millimetre and longer wavelengths driven by low-energy and high-current electron beams have been pursued by the plasma physics and microwave tube communities. This work has confined itself largely to the high-gain regimes in which collective effects may play an important role. On the other hand, short-wavelength free-electron lasers in the infrared and optical regimes have been pursued by the accelerator and laser physics community. Due to the high-energy and low-current electron beams appropriate to this spectral range, these experiments have operated largely in the low-gain single-particle regimes. The most recent books published on the free-electron laser by Dr C. A.
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Author: Nathan Majernik
Author: Thorben Seggebrock
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Author: C. W. Roberson
Author: H. P. Freund