Self-Amplification of Coherent Spontaneous Emission in a Cherenkov Free-Electron Maser

Wiggins, Mark; Jaroszynski, D. A.; McNeil, Brian; Robb, G. R. M.; Aitken, P. P.; Phelps, A. D. R.; Cross, A. W.; Ronald, K.; Shpak, V. G.; Yalandin, M. I.; Shunaĭlov, S. A.; Ul’maskulov, M. R.

doi:10.1103/physrevlett.84.2393

Cited by 29 publications

(27 citation statements)

References 19 publications

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“…Longer wavelength systems have demonstrated that bunch rise times $10k/c, where c is the speed of light in vacuum, are sufficiently rapid to seed self-amplified coherent spontaneous emission (SACSE) in FELs. 28,29 At k ¼ 150 nm, for example, this corresponds to a threshold rise time $5 fs. For our beam line setup as modelled in Fig.…”

Section: Applied Physics Lettersmentioning

confidence: 99%

An ultrashort pulse ultra-violet radiation undulator source driven by a laser plasma wakefield accelerator

Anania

Brunetti

Wiggins

et al. 2014

Applied Physics Letters

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Section: Applied Physics Lettersmentioning

confidence: 99%

An ultrashort pulse ultra-violet radiation undulator source driven by a laser plasma wakefield accelerator

Anania

Brunetti

Wiggins

et al. 2014

Applied Physics Letters

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“…Since the radiation pulse occurs on short time scales less than the single pass transit time of the device, numerical noise has not been an issue for these simulations. SASE and superradiance initiated by CSE have been observed in the Cerenkov maser [7,21,22]. Using PIC simulations, we can extract parameters associated with both the linear and nonlinear regimes of operation.…”

Section: Transient Sase Pic Simulationsmentioning

confidence: 99%

“…Cerenkov masers are attractive sources of radiation at centimeter and millimeter wavelengths [2][3][4] and have demonstrated high power capabilities [5,6]. Cerenkov masers also have applications in short pulse microwave generation by the SASE mechanism as observed by Wiggins et al [7]. An excellent treatment of the general subject of beam-wave interaction can be found in the text by Schächter [8].…”

Section: Introductionmentioning

confidence: 99%

Transient self-amplified Cerenkov radiation with a short pulse electron beam

Poole

Blackfield

Camacho

2009

Phys. Rev. ST Accel. Beams

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An analytic and numerical examination of the slow wave Cerenkov free electron maser is presented. We consider the steady-state amplifier configuration as well as operation in the self-amplified spontaneous emission (SASE) regime. The linear theory is extended to include electron beams that have a parabolic radial density inhomogeneity. Closed form solutions for the dispersion relation and modal structure of the electromagnetic field are determined in this inhomogeneous case. To determine the steady-state response, a macroparticle approach is used to develop a set of coupled nonlinear ordinary differential equations for the amplitude and phase of the electromagnetic wave, which are solved in conjunction with the particle dynamical equations to determine the response when the system is driven as an amplifier with a time harmonic source. We then consider the case in which a fast rise time electron beam is injected into a dielectric loaded waveguide. In this case, radiation is generated by SASE, with the instability seeded by the leading edge of the electron beam. A pulse of radiation is produced, slipping behind the leading edge of the beam due to the disparity between the group velocity of the radiation and the beam velocity. Short pulses of microwave radiation are generated in the SASE regime and are investigated using particle-in-cell (PIC) simulations. The nonlinear dynamics are significantly more complicated in the transient SASE regime when compared with the steady-state amplifier model due to the slippage of the radiation with respect to the beam. As strong self-bunching of the electron beam develops due to SASE, short pulses of superradiant emission develop with peak powers significantly larger than the predicted saturated power based on the steady-state amplifier model. As these superradiant pulses grow, their pulse length decreases and forms a series of solitonlike pulses. Comparisons between the linear theory, macroparticle model, and PIC simulations are made in the appropriate regimes.

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“…If ways are found to produce an electron bunch microstructure with Fourier components at the resonance frequency, a large stable 'spontaneous' coherent signal will act as an (intrinsic) injection source in the FEL amplifier (i.e. SACSE FEL; Wiggins et al 2000). This may be achievable using future laser-plasma accelerators because their predicted electron bunch durations can approach one femtosecond or less.…”

Section: Radiation Source Developmentmentioning

confidence: 99%

Radiation sources based on laser–plasma interactions

Jaroszynski

Bingham

Brunetti

et al. 2006

Phil. Trans. R. Soc. A.

120

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Document VersionPublisher's PDF, also known as Version of Record (includes final page, issue and volume numbers)Please check the document version of this publication:• A submitted manuscript is the author's version of the article upon submission and before peer-review. There can be important differences between the submitted version and the official published version of record. People interested in the research are advised to contact the author for the final version of the publication, or visit the DOI to the publisher's website.• The final author version and the galley proof are versions of the publication after peer review.• The final published version features the final layout of the paper including the volume, issue and page numbers. Link to publication General rightsCopyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright owners and it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights.• Users may download and print one copy of any publication from the public portal for the purpose of private study or research.• You may not further distribute the material or use it for any profit-making activity or commercial gain • You may freely distribute the URL identifying the publication in the public portal ? Take down policyIf you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim. Plasma waves excited by intense laser beams can be harnessed to produce femtosecond duration bunches of electrons with relativistic energies. The very large electrostatic forces of plasma density wakes trailing behind an intense laser pulse provide field potentials capable of accelerating charged particles to high energies over very short distances, as high as 1 GeV in a few millimetres. The short length scale of plasma waves provides a means of developing very compact high-energy accelerators, which could form the basis of compact next-generation light sources with unique properties. Tuneable X-ray radiation and particle pulses with durations of the order of or less than 5 fs should be possible and would be useful for probing matter on unprecedented time and spatial scales. If developed to fruition this revolutionary technology could reduce the size and cost of light sources by three orders of magnitude and, therefore, provide powerful new tools to a large scientific community. We will discuss how a laser-driven plasma wakefield accelerator can be used to produce radiation with unique characteristics over a very large spectral range.

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Self-Amplification of Coherent Spontaneous Emission in a Cherenkov Free-Electron Maser

Cited by 29 publications

References 19 publications

An ultrashort pulse ultra-violet radiation undulator source driven by a laser plasma wakefield accelerator

An ultrashort pulse ultra-violet radiation undulator source driven by a laser plasma wakefield accelerator

Transient self-amplified Cerenkov radiation with a short pulse electron beam

Radiation sources based on laser–plasma interactions

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