High-Gain Lasing and Polarization Switch with a Distributed Optical-Klystron Free-Electron Laser

Wu, Y.; Винокуров, Н.А.; Mikhailov, S.; Li, J.; Popov, V.

doi:10.1103/physrevlett.96.224801

Cited by 64 publications

(42 citation statements)

References 15 publications

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“…(2) The electron beam is actively switched between two EPUs by a fast kick system and is thus capable of delivering one radiation pulse at a time with different polarization [16]. (3) Adjusting the phase between two successive EPUs changes the intensity of circular polarized radiation and thus allows fast polarization switching from circular to linear in a hybrid undulators system [17]. In all of the above-mentioned methods, the circularly polarized radiation is generated from EPUs, and the fast switching can be accomplished between only two preset polarization handedness.…”

mentioning

confidence: 99%

“…With the advent of x-ray FELs in the last 10 years [2][3][4][5], a new era of x-ray science has arrived. Currently, the light source community is continuing to develop more sophisticated schemes in pursuit of, e.g., fast polarization switching [5][6][7][8][9][10][11][12][13][14][15][16][17], full coherence [18][19][20][21][22][23][24], compact x-ray configurations [25][26][27][28], and multicolor operation [29][30].…”

mentioning

confidence: 99%

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Polarization switching demonstration using crossed-planar undulators in a seeded free-electron laser

Deng

Zhang

Feng

et al. 2014

Phys. Rev. ST Accel. Beams

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Polarization switching of light sources is required over a wide spectral range to investigate the symmetry of matter. In this paper, we report the first experimental demonstration of the crossed-planar undulators technique at a seeded free-electron laser, which holds great promise for the full control and fast switching of the polarization of short-wavelength radiation. In the experiment, the polarization state of the coherent radiation at the second harmonic of the seed laser is switched successfully. The experimental results confirm the theory and pave the way for applying the crossed-planar undulators technique for seeded x-ray free-electron lasers.

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mentioning

confidence: 99%

mentioning

confidence: 99%

Polarization switching demonstration using crossed-planar undulators in a seeded free-electron laser

Deng

Zhang

Feng

et al. 2014

Phys. Rev. ST Accel. Beams

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“…At the Duke FEL Laboratory (DFELL), we operate storage ring FELs with several configurations [14]. One is the OK-4 FEL with two planar undulators, and another is the OK-5 FEL with two helical undulators.…”

Section: Energy Spread Measurement Using Optical Klystron a Expementioning

confidence: 99%

“…This new technique has been used to measure the energy spread of the electron beam in the Duke storage ring. The Duke storage ring is a dedicated circular accelerator for driving several storage ring FELs [14] and a Compton gamma-ray source, the high intensity gamma-ray source [4].…”

Section: Introductionmentioning

confidence: 99%

Electron beam energy spread measurements using optical klystron radiation

Jia

Huang

et al. 2010

Phys. Rev. ST Accel. Beams

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In accelerators, the electron beam longitudinal dynamics critically depend on the energy distribution of the beam. Noninvasive, highly accurate measurement of the energy spread of the electron beam in the storage ring remains a challenge. Conventional techniques are limited to measuring a relatively large energy spread using the energy spread induced broadening effect of radiation source size or radiation spectrum. In this work, we report a versatile method to accurately measure the electron beam relative energy spread from 10 À4 to 10 À2 using the optical klystron radiation. A novel numerical method based on the Gauss-Hermite expansion has been developed to treat both spectral broadening and modulation on an equal footing. A large dynamic range of the measurement is realized by properly configuring the optical klystron. In addition, a model-based scheme has been developed for the first time to compensate the beamemittance-induced inhomogeneous spectral broadening effect to improve the accuracy of the energy spread measurement. Using this technique, we have successfully measured the relative energy spread of the electron beam in the Duke storage ring from 6 Â 10 À4 to 6 Â 10 À3 with an overall uncertainty of less than 5%. The optical klystron is a powerful diagnostic for highly accurate energy spread measurement for storage rings and other advanced electron accelerators.

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“…A distributed optical klystron was proposed by Litvinenko [11] to increase the gain. The first successful experiment was conducted in the DOK-1 FEL, at Duke University, Durham, NC, USA [12], obtaining a gain of about 48% per pass.…”

Section: Introductionmentioning

confidence: 99%

Optical Klystron Enhancement to Self Ampliﬁed Spontaneous Emission at FERMI

et al. 2017

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Abstract:The optical klystron enhancement to a self-amplified spontaneous emission free electron laser has been studied in theory and in simulations and has been experimentally demonstrated on a single-pass high-gain free electron laser, the FERMI FEL-1, in 2014. The main concept consists of two undulators separated by a dispersive section that converts the energy modulation induced in the first undulator in density modulation, enhancing the coherent harmonic generation in the first part of the second undulator. This scheme could be replicated in a multi-stage: the bunching is enhanced after each dispersive section, consistently reducing the saturation length. We have applied the multi-stage optical klystron (OK) scheme on the FEL-2 line at FERMI, whose layout includes three dispersive sections. Optimizing the strength of the dispersions allowed a significant increase of the self-amplified spontaneous emission (SASE) intensity in comparison to a single-stage OK and extending to the soft-X rays the OK enhanced SASE previously demonstrated on FEL-1.

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High-Gain Lasing and Polarization Switch with a Distributed Optical-Klystron Free-Electron Laser

Cited by 64 publications

References 15 publications

Polarization switching demonstration using crossed-planar undulators in a seeded free-electron laser

Polarization switching demonstration using crossed-planar undulators in a seeded free-electron laser

Electron beam energy spread measurements using optical klystron radiation

Optical Klystron Enhancement to Self Ampliﬁed Spontaneous Emission at FERMI

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