dorsal/arxiv
View SchemaA new technique to generate 100 GW-level attosecond X-ray pulses from the X-ray SASE FELs
| Authors | E. L. Saldin, E. A. Schneidmiller, M. V. Yurkov |
|---|---|
| Categories | |
| ArXiv ID | physics/0403067 |
| URL | https://arxiv.org/abs/physics/0403067 |
| DOI | 10.1016/j.optcom.2004.05.024 |
Abstract
We propose a scheme for generation of single 100 GW 300-as pulse in the X-ray free electron laser with the use of a few cycles optical pulse from Ti:sapphire laser system. Femtosecond optical pulse interacts with the electron beam in the two-period undulator resonant to 800 nm wavelength and produces energy modulation within a slice of the electron bunch. Following the energy modulator the electron beam enters the first part of the baseline gap-adjustable X-ray undulator and produces SASE radiation with 100 MW-level power. Due to energy modulation the frequency is correlated to the longitudinal position within the few-cycle-driven slice of the SASE radiation pulse. The largest frequency offset corresponds to a single-spike pulse in the time domain which is confined to one half-oscillation period near the central peak electron energy. After the first undulator the electron beam is guided through a magnetic delay which we use to position the X-ray spike with the largest frequency offset at the "fresh" part of the electron bunch. After the chicane the electron beam and the radiation produced in the first undulator enter the second undulator which is resonant with the offset frequency. In the second undulator the seed radiation at reference frequency plays no role, and only a single (300 as duration) spike grows rapidly. The final part of the undulator is a tapered section allowing to achieve maximum output power 100-150 GW in 0.15 nm wavelength range. Attosecond X-ray pulse is naturally synchronized with its fs optical pulse which reveals unique perspective for pump-probe experiments with sub-femtosecond resolution.
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"abstract": "We propose a scheme for generation of single 100 GW 300-as pulse in the X-ray\nfree electron laser with the use of a few cycles optical pulse from Ti:sapphire\nlaser system. Femtosecond optical pulse interacts with the electron beam in the\ntwo-period undulator resonant to 800 nm wavelength and produces energy\nmodulation within a slice of the electron bunch. Following the energy modulator\nthe electron beam enters the first part of the baseline gap-adjustable X-ray\nundulator and produces SASE radiation with 100 MW-level power. Due to energy\nmodulation the frequency is correlated to the longitudinal position within the\nfew-cycle-driven slice of the SASE radiation pulse. The largest frequency\noffset corresponds to a single-spike pulse in the time domain which is confined\nto one half-oscillation period near the central peak electron energy. After the\nfirst undulator the electron beam is guided through a magnetic delay which we\nuse to position the X-ray spike with the largest frequency offset at the\n\"fresh\" part of the electron bunch. After the chicane the electron beam and the\nradiation produced in the first undulator enter the second undulator which is\nresonant with the offset frequency. In the second undulator the seed radiation\nat reference frequency plays no role, and only a single (300 as duration) spike\ngrows rapidly. The final part of the undulator is a tapered section allowing to\nachieve maximum output power 100-150 GW in 0.15 nm wavelength range. Attosecond\nX-ray pulse is naturally synchronized with its fs optical pulse which reveals\nunique perspective for pump-probe experiments with sub-femtosecond resolution.",
"arxiv_id": "physics/0403067",
"authors": [
"E. L. Saldin",
"E. A. Schneidmiller",
"M. V. Yurkov"
],
"categories": [
"physics.acc-ph",
"physics.optics"
],
"doi": "10.1016/j.optcom.2004.05.024",
"title": "A new technique to generate 100 GW-level attosecond X-ray pulses from the X-ray SASE FELs",
"url": "https://arxiv.org/abs/physics/0403067"
},
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