Spontaneous radiation from relativistic electrons in a taper undulator. Technical report
The spectrum, angular distribution, polarization and coherence properties of the radiation emitted by relativistic electrons undulating through a quasiperiodic tapered magnetic field are studied. Tapering the wavelength and/or field strength along the undulator's axis has the effect of spreading the spectral line to higher frequencies; interference over this broader spectral range results in a more complex line shape. The angular dependence, on the other hand, is not affected by the amount of taper. The polarization of the radiation in the forward direction is determined by the transverse polarization of the undulator, but the polarization changes off axis. The radiation patterns predicted here are distinct from those of untapered undulators, and their detection is now feasible. They will provide useful diagnostics of electron trajectories and threshold behavior in free-electron-laser oscillators using tapered undulators.
- Research Organization:
- California Univ., Santa Barbara (USA)
- OSTI ID:
- 6015284
- Report Number(s):
- AD-A-145430/5
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
420300* -- Engineering-- Lasers-- (-1989)
BEAMS
BREMSSTRAHLUNG
COHERENT RADIATION
ELECTRICAL EQUIPMENT
ELECTROMAGNETIC RADIATION
ELECTROMAGNETS
ELECTRON BEAMS
ELECTRON EMISSION
ELECTRONIC EQUIPMENT
EMISSION
ENERGY RANGE
EQUIPMENT
FREE ELECTRON LASERS
HARMONICS
LASERS
LEPTON BEAMS
MAGNETIC FIELDS
MAGNETS
OSCILLATIONS
OSCILLATORS
PARTICLE BEAMS
POLARIZATION
RADIATIONS
RELATIVISTIC RANGE
TRAJECTORIES
WIGGLER MAGNETS