Chirped-beam two-stage SASE-FEL for high power femtosecond X-ray pulse generation

Schroeder, C.B.; Pellegrini, C.; Reiche, S.; Arthur, John R.; Emma, P.

doi:10.1109/pac.2001.987897

Cited by 3 publications

(3 citation statements)

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“…Another approach is to put an energy chirp on the electron bunch -producing a frequency chirp of the output radiation. A monochromator can then be used to select a short slice of the pulse [44]. Improvement of the output of an FEL amplifier is currently an active area of research, and many other schemes are currently under investigation.…”

Section: Some Recent Experiments On Fel Amplifiersmentioning

confidence: 99%

The Physics and Properties of Free-Electron Lasers

Krinsky¹

2002

AIP Conference Proceedings

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Section: Some Recent Experiments On Fel Amplifiersmentioning

confidence: 99%

The Physics and Properties of Free-Electron Lasers

Krinsky¹

2002

AIP Conference Proceedings

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“…Investigations to produce such short radiation pulses have been widely carried out. [1][2][3][4] To achieve the short radiation pulse, it is necessary to obtain electron beams that have as short bunch length as possible. Thus, we investigated a two-stage bunch compressor in a linear accelerator to shorten the bunch length in the electron beam.…”

Section: Introductionmentioning

confidence: 99%

Beam Dynamics in a Linear Accelerator for Generations of Short Electron Beams and Femtosecond Hard X-ray Pulses

Kim¹

2007

jjap

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We investigate a linear accelerator system capable of generating short electron beams and femtosecond hard X-ray pulses. We show a detailed design for a two-stage bunch compressor to generate the short electron beams in the linear accelerator. The bunch compressor system consists of two chicanes with a short system length that can compress an electron bunch of 0.6 nC and beam energy of 162 MeV, from 3 to 0.5 ps rms. One important design issue in the bunch compressor is to make as small growths of the emittance and energy spread as possible. The normalized horizontal emittance of 3 mm mrad is increased by approximately 10% due to coherent synchrotron radiation in the designed bunch compressor. Lattice distortions due to machine errors associate with quadrupole magnets, bending magnets and beam position monitors in the linear accelerator were investigated. It is shown that the lattice distortions due to the machine errors can be easily compensated by performing both orbit correction and dispersion correction in the linear accelerator. We have performed tolerance studies due to the various jitter sources in the linear accelerator to examine their sensitivities on the beam quality. From these results, it is shown that the linear accelerator system provides sufficient tolerances to maintain stable electron beams. We also investigated the generation of femtosecond hard X-ray pulses that may be provided by the interactions at 90° of the short electron beams in the linear accelerator with a laser system. It is shown that 3.4×106 photons within 10% bandwidth at 0.04 Å wavelength in about 350 fs rms pulse may be provided using the linear accelerator system. We presented studies on beam dynamics in the linear accelerator system that may provide the short beams and intense X-ray pulses.

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“…The primary motivation is to allow xray image capture before molecular damage occurs in the sample from intense radiation. One of the most promising ways to achieve a significantly shorter pulse is with a chirped-beam, two-stage undulator scheme [31], [32]. The electron beam is shaped with a linear energy-time correlation so that the x-ray pulse generated in the first undulator stage is similarly chirped.…”

Section: Toward Shorter X-ray Pulsesmentioning

confidence: 99%

Issues and R&D critical to the LCLS

Emma

PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268)

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*The Linac Coherent Light Source (LCLS) [1] is a high brightness x-ray free-electron laser project based on the SLAC linac. A new photocathode rf gun serves as injector for the last kilometer of the linac, which is fitted with two-stages of bunch compression. Acceleration to 15-GeV produces intense 1.5-Å coherent radiation by selfamplified spontaneous emission in a long undulator. A multi-laboratory project collaboration is addressing the most challenging issues [2], including: 1) feasibility of a stable injector with normalized emittance of 1 µm at 1 nC; 2) emittance control in the linac including effects of coherent synchrotron radiation in the bunch compressors; 3) stability of the final electron beam in the presence of charge, timing, and energy variations; 4) design, construction and alignment of a long planar undulator with 3-cm period and discrete periodic focusing lattice; 5) understanding and control of wakefields due to wall surface roughness in the undulator vacuum chamber; 6) radiation-matter interactions in the strong field regime with mirror and crystal optics for filtering and deflecting. These issues, and a project update, are presented.

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Chirped-beam two-stage SASE-FEL for high power femtosecond X-ray pulse generation

Cited by 3 publications

References 4 publications

The Physics and Properties of Free-Electron Lasers

The Physics and Properties of Free-Electron Lasers

Beam Dynamics in a Linear Accelerator for Generations of Short Electron Beams and Femtosecond Hard X-ray Pulses

Issues and R&D critical to the LCLS

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