Time and frequency domain analysis of superradiant coherent synchrotron radiation in a waveguide free-electron laser

Gover, A.; Hartemann, F. V.; Sage, G. P. Le; Luhmann, Neville C.; Zhang, R. S.; Pellegrini, C.

doi:10.1103/physrevlett.72.1192

Cited by 75 publications

(35 citation statements)

References 8 publications

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“…To explore this possibility it is necessary to transform (6) to the time domain. Following [19] one obtains Er ? ; L; t / NjẼ q r ?…”

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Superradiant Spin-Flip Radiative Emission of a Spin-Polarized Free-Electron Beam

Gover

2006

Phys. Rev. Lett.

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Radiative emission from the magnetic moments of the spins of an electron beam has never been observed directly, because it is fundamentally much weaker than the electric charge emission. We show that the detectivity of spin-flip and combined spin-flip-cyclotron-resonance-emission radiation can be substantially enhanced by operating with ultrashort spin-polarized electron beam bunches under conditions of superradiant (coherent) emission. The proposed superradiant spin-flip radiative emission scheme can be used for noninvasive diagnostics of polarized electron or positron beams. Such beams are of relevance in important scattering experiments off nucleons in nuclear physics and off magnetic targets in condensed matter physics.

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“…To explore this possibility it is necessary to transform (6) to the time domain. Following [19] one obtains Er ? ; L; t / NjẼ q r ?…”

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confidence: 98%

Superradiant Spin-Flip Radiative Emission of a Spin-Polarized Free-Electron Beam

Gover

2006

Phys. Rev. Lett.

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“…[1][2][3][4][5][6][7] In particular, considerable theoretical [8][9][10][11] and experimental 12,13 research effort has been recently devoted to investigating the coherent synchrotron radiation process in a waveguide free-electron laser ͑FEL͒. 14 In this type of structure, an ultrashort electron bunch ͑shorter than the radiation wavelength͒, such as that produced by a rf photoinjector, is transversally accelerated within a waveguide by a wiggler field to generate high-power, short pulses of coherent electromagnetic radiation, with numerous applications ranging from surface 15 and solid state physics, 16 millimeter-wave and far infrared photochemistry and photophysics, 17 to ultrawideband radars and communications.…”

Section: Introductionmentioning

confidence: 99%

“…3 In this regime, the electrons are not phase correlated and the incoherent superposition of each electron's contribution to the radiation field yields very low-power emission, with the usual incoherent noise phase statistics. In the other limit, which we call coherent synchrotron radiation, 8,9,[11][12][13] or the coherent spontaneous radiation regime, the electron bunch length is shorter than the radiation wavelength. The bunch then essentially behaves as a single point charge, which coherently radiates high-power millimeter wave radiation.…”

Section: Introductionmentioning

confidence: 99%

“…Since, by definition, slippage is equal to zero at grazing, the question arises as to what physical mechanism determines the final output pulse duration in this regime. Recent theoretical work [8][9][10][11] has answered this question and demonstrated the possibility of producing ultrashort, frequency chirped pulses when the FEL grazing condition is satisfied. Under these circumstances, the pulse length is no longer determined by slippage, as is the usual case.…”

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confidence: 99%

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Transform-limited coherent synchrotron radiation wavepackets in a chirped pulse free-electron laser

et al. 1996

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A novel source of transform-limited pulses of coherent electromagnetic radiation relying on the synchrotron radiation process in a fast wave guiding structure is investigated theoretically. An ultrashort electron bunch transversally accelerated by a periodic external field is considered. At grazing, where the bunch and group velocities are matched, the duration of the resulting ultrawideband chirped pulse is governed by group velocity dispersion instead of slippage. Because of the intimate connection between the rate of chirping and the bandwidth, the corresponding pulse duration is shown to be very close to the Fourier transform limit. In addition, the propagation of such chirped pulses through a guiding structure with negative group velocity dispersion is investigated both theoretically and computationally. The spectral and temporal characteristics of the chirped and compressed pulses are derived analytically. Detailed computer calculations complement this theoretical analysis.

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“…15 Constructive accumulation of the cavity modes over successive bunches is an independent matter from mode excitation of individual bunches. However, an expansion of the accumulation condition (Eq.…”

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Cooperative accumulation of coherent undulator radiation emitted from periodic electron bunches

Seo¹

2013

Physics of Plasmas

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Cavity build-up of coherent undulator synchrotron radiation emitted by periodic electron bunches is investigated. At the optimal off-grazing resonance, the bunch slippage relative to the radiation pulse introduces an initial transient period during which radiation accumulates cooperatively as if it is emitted by a single bunch. The power growth during the period is quadratic to the number of bunches. The number of cooperative bunches is ∼2 ℓs 2, where ℓs denotes the slippage length in units of the resonant wavelength.

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Time and frequency domain analysis of superradiant coherent synchrotron radiation in a waveguide free-electron laser

Cited by 75 publications

References 8 publications

Superradiant Spin-Flip Radiative Emission of a Spin-Polarized Free-Electron Beam

Superradiant Spin-Flip Radiative Emission of a Spin-Polarized Free-Electron Beam

Transform-limited coherent synchrotron radiation wavepackets in a chirped pulse free-electron laser

Cooperative accumulation of coherent undulator radiation emitted from periodic electron bunches

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