Quantum regime of free electron lasers starting from noise

Bonifacio, R.; Piovella, N.; Robb, G. R. M.; Schiavi, A.

doi:10.1103/physrevstab.9.090701

Cited by 59 publications

(92 citation statements)

References 23 publications

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“…However, despite the high photon energy the selected 2 GeV kinetic energy of the electrons is much higher and the fractional energy loss from recoil with the FEL photons becomes negligible. The quantum FEL parameter, defined by the ratio of the final momentum spread of the electron beam at saturation and the photon momentum recoil [38,39] serves as a guide for possible FEL operation in the quantum regime:…”

Section: B Conditions From the One-dimensional Fel Modelmentioning

confidence: 99%

Proposed dielectric-based microstructure laser-driven undulator

Plettner

Byer

2008

Phys. Rev. ST Accel. Beams

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We describe a proposed all-dielectric laser-driven undulator for the generation of coherent short wavelengths and explore the required electron beam parameters for its operation. The key concept for this laser-driven undulator is its ability to provide phase synchronicity between the deflection force from the laser and the electron beam for a distance that is much greater than the laser wavelength. Because of the possibility of high-peak electric fields from ultrashort pulse lasers on dielectric materials, the proposed undulator is expected to produce phase-synchronous GV=m deflection fields on a relativistic electron bunch and therefore lead to a very compact free electron based radiation device.

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Section: B Conditions From the One-dimensional Fel Modelmentioning

confidence: 99%

Proposed dielectric-based microstructure laser-driven undulator

Plettner

Byer

2008

Phys. Rev. ST Accel. Beams

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“…The result is a single narrow-line spectrum that is Fourierlimited by the electron-beam duration, i.e., ∆ω/ω λ/L b . 6,7 This means that a QFEL operating in theÅngstrom region with an electron-bunch length L b = 1mm could generate radiation with a relative linewidth of 10 −7 , much smaller than the envelope linewidth 2ρ of the classical SASE spectrum (typically of order 10 −3 ).…”

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confidence: 99%

The quantum free-electron laser

Bonifacio

Piovella

Cola

et al. 2008

Nuclear Instruments and Methods in Physics Research Section A:

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An ultracompact brilliant coherent x-ray source, where both the accelerator and the wiggler are provided by intense laser pulses, promises unsurpassed spectral and temporal qualities.Ultrashort pulses of x-ray radiation from synchrotron sources have become ubiquitous tools for investigating the structure of matter. Their immense usefulness has led to the development of large international facilities. These are based on radiofrequency accelerating cavities and magnetic undulators, and provide brief radiation pulses capable of probing and taking 'snapshots' of molecules and solid-state matter. However, synchrotron sources produce pulses of incoherent radiation that are limited to relatively low peak brilliance and durations of order a picosecond and longer. As a next significant step in advancing xray sources, the free-electron laser (FEL) produces femtosecondduration pulses with a peak brilliance seven orders of magnitude higher than synchrotrons.Several large international teams are constructing FELs to produce x-ray radiation through self-amplified spontaneous emission (SASE): the Linac Coherent Light Source 1 in Stanford, CA, the European XFEL 2 in Hamburg, Germany, and the SPring-8 Compact SASE Source 3 in Hyōgo prefecture, Japan. One drawback of such sources is that they produce pulses composed of many random superradiant spikes with a broad noise spectrum. 4 In the classical picture of the FEL, this spiky x-ray pulse results from the random initial phases of electrons entering the amplifier. However, it is clear from quantum theory that the emission process is discrete. Moreover, it must include quantization of the electron motion, which completely changes both the properties of the emitted radiation and the resulting momentum distribution of the electrons. Accordingly, an FEL operating in the quantum regime should offer improved performance over its classical counterpart, in particular, enhanced spectral brightness and degree of coherence.When an electron emits a photon, the momentum recoil ishk. This is naturally quantized and can assume only the discrete values n(hk). In classical FEL theory, the initial spontaneous-radiation field is amplified through the 'ponderomotive' force resulting from the interference of the radiation and undulator fields. This leads to electron bunching on a wavelength scale and exponential amplification with a rate governed by ρ, the FEL parameter. 5 ρ depends on the undulator period, and magnetic-field strength and electron-beam parameters such as, e.g., the Lorentz factor at resonance for a particular wavelength of the amplified light, γ r , peak current, and emittance. The number of photons emitted depends on ρ, and is given by the quantum-FEL (QFEL) parameter 6 ρ = ρ mcγ r hk ,which is the ratio of the maximum classical momentum spread (of order mcγ r ρ) tohk. Whenρ 1, many momentum levels are involved since the momentum spread is much larger than the Continued on next page

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Section: Introductionmentioning

confidence: 99%

“…The classical analysis is valid only for 1 >> ρ , whereas for 1 < ρ the quantum effects dominate [3,4]. In particular, in the quantum Self Amplified Spontaneous Emission (SASE) mode operation, the quantum purification of the radiation spectrum has been predicted [3,4], i.e. the broad and chaotic spectrum predicted in the classical SASE [5] and observed experimentally [6] shrinks to a very narrow spectrum when the photons of a counter-propagating high power laser, with a frequency up-shifted by a factor 4γ 2 .…”

Section: Introductionmentioning

confidence: 99%

Parametric Optimization for an X-Ray Free Electron Laser With a Laser Wiggler

Bonifacio

Piovella

Cola

2007

The Physics and Applications of High Brightness Electron Beams

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In this paper we optimize the experimental parameters to operate a Free Electron Laser with a laser wiggler in the Angstrom region. We show that the quantum regime of the Self Amplified Spontaneous Emission (Quantum SASE) may be reached with realistic parameters. The classical SASE regime is also discussed and compared with the quantum regime. : 41.60.Cr; 42.50.Fx * e-mai address: rodolfob@cbpf.br. PACS

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Quantum regime of free electron lasers starting from noise

Cited by 59 publications

References 23 publications

Proposed dielectric-based microstructure laser-driven undulator

Proposed dielectric-based microstructure laser-driven undulator

The quantum free-electron laser

Parametric Optimization for an X-Ray Free Electron Laser With a Laser Wiggler

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