Coherent emission and gain from a bunched electron beam

Doria, A.; Bartolini, R.; Feinstein, J.; Gallerano, Gian Piero; Pantell, R. H.

doi:10.1109/3.236158

Cited by 120 publications

(46 citation statements)

References 12 publications

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“…The velocity modulated electron beam from the input cavity interacts with the microwave E-field in the output cavity, which emits strong coherent radiation. As a result, enlarged microwave power can be obtained [13][14][15]. Most FEL research either operates at very high voltage or current, or both.…”

Section: Introductionmentioning

confidence: 99%

The Experimental Results of a Low Power X-Band Free Electron Maser by Electron Pre-Bunching

Malek¹,

Lucas²,

Huang³

2010

PIER

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Abstract-We have developed a proof-of-concept low power free electron maser that is compact and low cost. The design, set-up and results of a novel (without wiggler) low power X-band rectangular waveguide pre-bunched free electron maser (PFEM) are presented in this paper. Our device operates at 10 GHz, with 10 mWatt seeding input power and employs two rectangular waveguide cavities (one for velocity modulation and the other for energy extraction). The electron beam used in this experiment is produced by Thoria coated Iridium filament which can operate at 3 kV and up to 5 mA beam current. The effect of the aperture on the power leaking out of the waveguide is also analyzed. The TE 10 mode propagation of the EM standing wave is used to pre-bunch the electron beams in the input cavity. The bunched electron beams are in the same phase as the TE 10 mode propagation of the EM wave in the output cavity. This free electron maser could be useful industrially, as it could be used with the commercially available accelerating voltage supplies.

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Section: Introductionmentioning

confidence: 99%

The Experimental Results of a Low Power X-Band Free Electron Maser by Electron Pre-Bunching

Malek¹,

Lucas²,

Huang³

2010

PIER

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“…For compact FEL's driven by low current electron beams, however, the space charge effects are not important, and the interaction mechanism is dominated by waveguide dispersion with a negligible field variation in the transverse dimensions of the waveguide [1], [2], [4]- [6]. Hence, compact waveguide FEL's may be analyzed in the single-particle regime with both the wiggler field and the radiation field approximated by their on-axis values.…”

Section: Small-signal Analysismentioning

confidence: 99%

“…The total energy change of the reference electron over the entire wiggler magnet is the sum of its energy change in each section. Therefore, from (4) and (5), we have (6) where and for compact expression of derivation , and are introduced. From (6), it is clear that to the first order of the radiation field, the net energy change of the electron beam is zero.…”

Section: Small-signal Analysismentioning

confidence: 99%

Mode-selective amplification in a waveguide free electron laser with a two-sectioned wiggler

Kong

1998

IEEE Trans. Plasma Sci.

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“…This intense coherent spontaneous radiation (CSR) is sometimes dubbed as electron superradiance [9]. Previously CSR has been studied and demonstrated for single and repeated electron bunches from radio-frequency linear accelerators [10]. Although an ideal zero-length electron bunch can ensure fully coherent radiation, it is possible to compensate decoherence of the fields in a finitelength electron bunch by introducing a suitable energy ramp to the bunch [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Isolated few-cycle radiation from chirped-pulse compression of a superradiant free-electron laser

Huang

Zhang

Chen

et al. 2015

Phys. Rev. ST Accel. Beams

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When a short electron bunch traverses an undulator to radiate a wavelength longer than the bunch length, intense superradiance from the electron bunch can quickly deplete the electron's kinetic energy and lead to generation of an isolated chirped radiation pulse. Here, we develop a theory to describe this novel chirped pulse radiation in a superradiant free-electron laser and show the opportunity to generate isolated few-cycle high-power radiation through chirped-pulse compression after the undulator. The theory is completely characterized by how fast the electron energy is depleted for a given length of an undulator. We further present two design examples at the THz and extreme-ultraviolet wavelengths and numerically generate isolated three-and nine-cycle radiation pulses, respectively.

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Coherent emission and gain from a bunched electron beam

Cited by 120 publications

References 12 publications

The Experimental Results of a Low Power X-Band Free Electron Maser by Electron Pre-Bunching

The Experimental Results of a Low Power X-Band Free Electron Maser by Electron Pre-Bunching

Mode-selective amplification in a waveguide free electron laser with a two-sectioned wiggler

Isolated few-cycle radiation from chirped-pulse compression of a superradiant free-electron laser

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