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WEC01 |
A Concept for a Plasma Wakefield Accelerator Driven FEL |
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- M.J. Hogan
SLAC, Menlo Park, California, USA
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Funding: Work supported in part by the U.S. Department of Energy under contract number DE-AC02-76SF00515.
Plasma wakefield accelerators have received much attention for their ability to boost the energy of electrons by several GeV in a space of a few centimeters to a meter. In addition, the compact size of the accelerating wakefield in the plasma favors beams with femtosecond duration, small size and ultimately small emittance. The plasma accelerator community is studying multiple methods to inject electrons into the plasma wake and produce high brightness beams. By leveraging the high-rep rate beam drivers made possible by superconducting RF technology and ideas for controlled injection into the plasma wake, a meter scale plasma could serve as both and energy and brightness transformer, producing beams that surpass the state of the art and open new avenues for XFEL development. In this talk I will summarize the status of plasma wakefield accelerator research, present a concept for a plasma wakefield accelerator driven XFEL and discuss the outlook for the next few years.
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Slides WEC01 [34.737 MB]
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WEC02 |
High Gradient IFEL Acceleration and Deceleration in Strongly Tapered Undulators |
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- J.P. Duris, P. Musumeci
UCLA, Los Angeles, California, USA
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Efficient coupling of relativistic electron beams with high power radiation lies at the heart of advanced accelerator and light source research and development. Recent inverse free electron laser experiments using strongly tapered undulators have demonstrated high-gradient acceleration of >50% of injected electrons, producing beams of high-quality. By accommodating the evolving radiation field in the design of the undulator tapering, a large fraction of energy may be transferred between the electrons and laser, enabling compact, high-current GeV accelerators and various wavelength light-sources of unprecedented peak powers.
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Slides WEC02 [5.405 MB]
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WEC03 |
Generating Intense Fully Coherent Soft X-Ray Radiation Based on a Laser-Plasma Accelerator |
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- C. Feng, H.X. Deng, Z.T. Zhao
SINAP, Shanghai, People's Republic of China
- D. Xiang
Shanghai Jiao Tong University, Shanghai, People's Republic of China
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Funding: This work is supported by the National Natural Science Foundation of China (11475250, 11175240, 11275253, and 11322550).
Laser-plasma based accelerator has the potential to dramatically reduce the size and cost of future x-ray light sources to the university-laboratory scale. However, the large energy spread of the laser-plasma accelerated electron beam may hinder the way for short wavelength free-electron laser generation. In this paper, we propose a novel method for directly imprinting strong coherent micro-bunching on the electron beam with large intrinsic energy spread by using a wavefront-tilted conventional optical laser beam and a weak dipole magnet. Theoretical analysis and numerical simulations demonstrate that this technique can be used for the generation of fully coherent femtosecond soft x-ray radiation at gigawatts level with a very short undulator.
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Slides WEC03 [3.405 MB]
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WEC04 |
Subradiant Spontaneous Undulator Emission through Collective Suppression of Shot Noise |
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- D.F. Ratner, E. Hemsing, A. Marinelli
SLAC, Menlo Park, California, USA
- A. Gover
University of Tel-Aviv, Faculty of Engineering, Tel-Aviv, Israel
- A. Nause
UCLA, Los Angeles, USA
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The phenomenon of Dicke's subradiance, in which the collective properties of a system suppress radiation, has received broad interest in atomic physics, but can also be applied to relativistic electron beams. The resulting "quiet" beam generates less spontaneous undulator radiation than emitted even by a random shot noise beam. Quiet beams could have diverse accelerator applications, including lowering power requirements for seeded FELs. Here we present recent experimental observations at the Next Linear Collider Test Accelerator and discuss prospects for pushing the phenomenon to X-ray wavelengths.
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Slides WEC04 [2.935 MB]
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