High-Gain Harmonic-Generation Free-Electron Laser

Yu, Lihua; Babzien, M.; Ben‐Zvi, I.; DiMauro, Louis F.; Doyuran, A.; Graves, W.; Johnson, E.; Krinsky, S.; Malone, R.; Pogorelsky, Igor; Skaritka, J.; Rakowsky, G.; Solomon, L.; Wang, X. J.; Woodle, M.; Yakimenko, V.; Biedron, Sandra; Galayda, J.; Gluskin, E.; Jagger, John; Sajaev, V.; Vasserman, I.

doi:10.1126/science.289.5481.932

Cited by 442 publications

(275 citation statements)

References 25 publications

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“…The process is similar to that of high-gain harmonic generation (HGHG) demonstrated at the DUV FEL [21,40,41]. One, two, and three-stage harmonic cascade FELs are shown in the return straights in Figure 1.…”

Section: Photon Production and X-ray Beamlinesmentioning

confidence: 65%

“…The recirculating linac accelerates picosecond duration electron bunches to GeV-level energies. Intense, ultrafast (10's to 100's femtoseconds duration) soft x-rays are produced by cascaded harmonic generation (CHG) scheme [19,20], similar to high-gain harmonic-generation (HGHG) [21] -a laser-seeded process in a cascaded series of undulators, resulting in enhanced radiation at selected harmonics of the seed. The coherent soft x-rays can be tuned over a range of tens of eV to 1 keV, and ultrashort optical seed laser pulses produce x-ray pulse durations of 10-200 fs.…”

Section: Accelerator Systemsmentioning

confidence: 99%

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LUX: a design study for a linac-/laser-based ultrafast x-ray source

et al. 2004

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We describe the design concepts for a potential future source of femtosecond x-ray pulses based on synchrotron radiation production in a recirculating electron linac. Using harmonic cascade free-electron lasers (FEL's) and spontaneous emission in short-period, narrow-gap insertion devices, a broad range of photon energies are available with tunability from EUV to hard x-ray regimes. Photon pulse durations are controllable and range from 10 fs to 200 fs, with fluxes 10 7 -10 12 photons per pulse. Full spatial and temporal coherence is obtained for EUV and soft X-rays. A fiber laser master oscillator and stabilized timing distribution scheme are proposed to synchronize accelerator rf systems and multiple lasers throughout the facility, allowing timing synchronization between sample excitation and X-ray probe of approximately 20-50 fs.

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Section: Photon Production and X-ray Beamlinesmentioning

confidence: 65%

Section: Accelerator Systemsmentioning

confidence: 99%

LUX: a design study for a linac-/laser-based ultrafast x-ray source

et al. 2004

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“…In 2000, a seeded FEL at 1.06 m combined to the generation of coherent harmonics has been demonstrated experimentally [3], establishing that the seeded beam gave its full coherence property to the emitted radiation and allowed to decrease the saturation length in a more compact source. Also, injection of a single-pass FEL by the 3 rd laser harmonic of a Ti:Sapphire laser from crystals (266 nm, 4 J, 5 ps FWHM) led to large amplification [4].…”

Section: Introductionmentioning

confidence: 99%

The SCSS test accelerator Free-Electron Laser seeded by harmonics produced in gas

Lambert

Tanikawa²,

Garzella

et al. 2009

UVX 2008 - 9e Colloque Sur Les Sources Cohérentes Et Incohérentes UV, VUV Et X : Applications Et Développements Récents

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Abstract. Today, single-pass Free-Electron Lasers (FEL) produce a highly bright radiation, the Self Amplified Spontaneous Emission (SASE), which spectral and temporal profiles are composed of a series of spikes. We demonstrate here the strong and coherent amplification of the 5 th harmonic of a Ti: Sa laser (800 nm, 10 Hz, 100 fs) generated in a gas cell, i.e. 160 nm, by the SCSS (SPring-8 Compact SASE Source, Japan) Test Accelerator FEL. This is obtained by overlapping transversally, spectrally and temporally the external harmonic source in the in-vacuum undulator with the electron beam (150 MeV, 10 Hz, 1 ps). With only one undulator section, the 160 nm seeded emission achieves three orders of magnitude higher intensity than the unseeded one, and presents a quasi perfect Gaussian shape in the spectral distribution. With two undulator sections, the seeded FEL spectrum reveals first effects of saturation. Those spectacular phenomena are associated to the generation of intense and coherent Non Linear Harmonics (NLH) at 54 nm and 32 nm. Finally, in view of the low seed level required, such amplification associated to NLH schemes would allow the generation of fully coherent soft X-ray radiations down to the water window.

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“…In this process the circular cross-section high-brightness electron beam is extracted from the recirculating linac, and passed through an undulator where a co-propagating seed laser modulates the charge distribution over a short length of the bunch. The scheme has been developed and demonstrated at the Brookhaven DUV FEL facility [3]. The imposed modulation results in enhanced radiation at specific wavelengths and a selected wavelength is amplified in a following undulator, tuned to a higher harmonic of the seed laser.…”

Section: Accelerator Designmentioning

confidence: 99%

“…Intense soft x-rays are produced by cascaded harmonic generation scheme, similar to high-gain harmonic-generation (HGHG) -a laser-seeded process in a cascaded series of undulators, resulting in enhanced radiation at selected harmonics of the seed [3]. The coherent soft x-rays can be tuned over a range of tens of eV to 1 keV, and ultrashort seed laser pulses produce pulse durations of 10-200 fs.…”

Section: Overviewmentioning

confidence: 99%

A recirculating linac-based facility for ultrafast x-ray science

Corlett

Barletta

DeSantis

et al.

Proceedings of the 2003 Bipolar/BiCMOS Circuits and Technology Meeting (IEEE Cat. No.03CH37440)

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We present an updated design for a proposed source of ultra-fast synchrotron radiation pulses based on a recirculating superconducting linac [1,2], in particular the incorporation of EUV and soft x-ray production. The project has been named LUX -Linac-based Ultrafast X-ray facility. The source produces intense x-ray pulses with duration of 10-100 fs at a 10 kHz repetition rate, with synchronization of 10's fs, optimized for the study of ultra-fast dynamics. The photon range covers the EUV to hard x-ray spectrum by use of seeded harmonic generation in undulators, and a specialized technique for ultra-shortpulse photon production in the 1-10 keV range. Highbrightness rf photocathodes produce electron bunches which are optimized either for coherent emission in freeelectron lasers, or to provide a large x/y emittance ration and small vertical emittance which allows for manipulation to produce short-pulse hard x-rays. An injector linac accelerates the beam to 120 MeV, and is followed by four passes through a 600-720 MeV recirculating linac. We outline the major technical components of the proposed facility.

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High-Gain Harmonic-Generation Free-Electron Laser

Cited by 442 publications

References 25 publications

LUX: a design study for a linac-/laser-based ultrafast x-ray source

LUX: a design study for a linac-/laser-based ultrafast x-ray source

The SCSS test accelerator Free-Electron Laser seeded by harmonics produced in gas

A recirculating linac-based facility for ultrafast x-ray science

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