Output characteristics of SASE-driven short-wavelength FELs

Fawley, William M.

doi:10.1117/12.274372

Cited by 9 publications

(4 citation statements)

References 5 publications

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“…The typical design under consideration for these systems is the SASE FEL to avoid the requirements for an external source or good X-ray mirrors. Here, shot noise [93] in the initial electron bunch provides the initial photons, typically having an equivalent power of 10 to 1000 watts due to the large electron charges involved [94]. However, the short wavelength required demand relatively high electron energies, and most designs involve beam energies of 1 GeV or more.…”

Section: A Sase For Short Wavelengthsmentioning

confidence: 99%

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Free-electron lasers: vacuum electronic generators of coherent radiation

Freund

Neil²

1999

Proc. IEEE

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Vacuum electronic sources have shown marked improvement since the invention of the magnetron before World War II, and dramatic increases in both average powers and frequencies have been achieved. Of course, much of these gains have been achieved by the development of different devices. The typical development pattern for a given device exhibits an initial period of rapid improvement followed by a plateau determined by technological or physical limitations on the concept. Slow wave devices such as magnetrons and/or klystrons operate efficiently at frequencies up through X-band or he source of the relation ed cavity traveling wave tubes are used for various applications at frequencies ranging up through W-band. At still higher frequencies fast wave devices such as gyrotrons and free-electron lasers are required are required for high power operation.The free-electron laser concept is unique in that the mechanism is applicable across the entire electromagnetic spectrum, and free-electron lasers have been built at wavelengths from microwaves through the ultraviolet, and plans are under development for X-ray systems. Our purpose of this paper is to describe the principal directions of free-electron laser research at the present time. To this end, we first give a brief tutorial of the physics underlying the concept, and then describe the principal development paths under way.

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Section: A Sase For Short Wavelengthsmentioning

confidence: 99%

“…Theoretical efforts [93] predict the production of short, intense spikes within the micropulse separated by the effective cooperation length. This is similar to effects seen in oscillators at high gain [103,104].…”

Section: A Sase For Short Wavelengthsmentioning

confidence: 99%

Free-electron lasers: vacuum electronic generators of coherent radiation

Freund

Neil²

1999

Proc. IEEE

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“…Our basic perspective will be to view the pulse parameter space of the SASE XRFEL as a limiting case of the pulse parameters typically found on synchrotron storage rings. To initiate our discussion, we first recall the basic phase space properties predicted for the 1.5 Å SLAC LCLS [20,21]. In practical terms, the pulse is about as long as it is wide and has a temporal fine structure consisting of regions longitudinally on the order of 1 fs in length and transversely fully coherent (viz., with diameters equal to the full pulse diameter).…”

Section: Introductionmentioning

confidence: 99%

Short-Pulse Limits in Optical Instrumentation Design for the SLAC Linac Coherent Light Source (LCLS)

Tatchyn¹

2005

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The source properties of linac-driven X-Ray Free-Electron Lasers (XRFELs) operating in the Self-Amplified Spontaneous Emission (SASE) regime differ markedly from those of ordinary insertion devices on synchrotron storage rings. In the case of the 1.5 Å SLAC Linac Coherent Light Source (LCLS), the longitudinal output profile typically consists of a randomly-distributed train of fully-transversely-coherent micropulses of randomly varying intensity and an average length (corresponding to the source coherence length) two to three orders of magnitude smaller than the transverse diameter of the beam. Total pulse lengths are typically of the same order of size as the beam diameter. Both of these properties can be shown to significantly impact the performance of otherwise conventional synchrotron radiation optics; viz., mirrors, lenses, zone plates, crystals, multilayers, etc. In this paper we outline an analysis of short-pulse effects on selected optical components for the SLAC LCLS and discuss the implications for critical applications such as microfocusing and monochromatization.

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“…To initiate our discussion, we first recall the basic phase space properties predicted for the 1.5 Å SLAC LCLS [20,21]. In practical terms, the pulse is about as long as it is wide and has a temporal fine structure consisting of regions longitudinally on the order of 1 fs in length and transversely fully coherent (viz., with diameters equal to the full pulse diameter).…”

Section: Introductionmentioning

confidence: 99%

Short-pulse limits in optical instrumentation design for the SLAC Linac Coherent Light Source (LCLS)

Tatchyn¹

2000

AIP Conference Proceedings

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Abstract. The source properties of linac-driven X-Ray Free-Electron Lasers (XRFELs) operating in the Self-Amplified Spontaneous Emission (SASE) regime differ markedly from those of ordinary insertion devices on synchrotron storage rings. In the case of the 1.5 Å SLAC Linac Coherent Light Source (LCLS), the longitudinal output profile typically consists of a randomly-distributed train of fully-transversely-coherent micropulses of randomly varying intensity and an average length (corresponding to the source coherence length) two to three orders of magnitude smaller than the transverse diameter of the beam. Total pulse lengths are typically of the same order of size as the beam diameter. Both of these properties can be shown to significantly impact the performance of otherwise conventional synchrotron radiation optics; viz., mirrors, lenses, zone plates, crystals, multilayers, etc. In this paper we outline an analysis of short-pulse effects on selected optical components for the SLAC LCLS and discuss the implications for critical applications such as microfocusing and monochromatization.

show abstract

Output characteristics of SASE-driven short-wavelength FELs

Cited by 9 publications

References 5 publications

Free-electron lasers: vacuum electronic generators of coherent radiation

Free-electron lasers: vacuum electronic generators of coherent radiation

Short-Pulse Limits in Optical Instrumentation Design for the SLAC Linac Coherent Light Source (LCLS)

Short-pulse limits in optical instrumentation design for the SLAC Linac Coherent Light Source (LCLS)

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