Abstract
Cavity accumulation of coherent undulator synchrotron radiation emitted by a train of periodic electron bunches is investigated. Phase-matching conditions for accumulation of radiation emitted by successive bunches are analyzed and numerically confirmed. While the coherent emission of a single bunch is optimal at grazing resonance, the accumulated radiation targeted at the upper resonant frequency of the waveguide mode is found to have much broader bandwidth and higher efficiency as the resonance steps away from the grazing condition. Numerical results confirm that stimulated superradiance is responsible for the accumulated radiation.
Highlights
Coherent effect [1,2] or superradiance describes emission of radiation from a group of radiators whose individual fields are emitted in phase so that they may add up constructively
Carr et al [3] demonstrated that the coherent effect in a subpicosecond electron bunch enhanced the power level of synchrotron radiation emission in the terahertz (THz) frequency range [4] by many orders of magnitude
It is the average background radiation power felt by bunch electrons during their flight in the cavity. We argue that this background radiation is stimulating the radiation emission in successive periodic bunches
Summary
Coherent effect [1,2] or superradiance describes emission of radiation from a group of radiators whose individual fields are emitted in phase so that they may add up constructively. Coherent emission of relativistic electrons bunched within a length shorter than the wavelength of emitted radiation is an example. Carr et al [3] demonstrated that the coherent effect in a subpicosecond electron bunch enhanced the power level of synchrotron radiation emission in the terahertz (THz) frequency range [4] by many orders of magnitude. Rather than the coherent emission of a single bunch, the present work considers cumulative effect of repeated bunches in a resonating cavity. The radiation field excited by earlier bunches may stimulate radiation emission of the following bunches, enhancing their individual
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