Theory of radiation by electrons in a spiral undulator with a longitudinal magnetic field
Journal Article
·
· Journal of Experimental and Theoretical Physics
OSTI ID:183631
- Kurchatov Institute, Moscow (Russian Federation)
We develop in this paper a theory for the spontaneous and stimulated emission by relativistic electrons in a magnetic field which is a superposition of the spiral field of an undulator and a uniform longitudinal field. We show that the electron trajectories precess in the transverse plane, while along the axis of the undulator longitudinal oscillations are excited with an amplitude which depends on the magnitude of the longitudinal field. We find in analytical form the frequency and angle distribution of the emitted energy when the electrons move along such trajectories. Using the results for the spectra of the spontaneous emission and the energy and longitudinal quasimomentum conservation laws for the emission and the absorption of a photon by an electron we obtain relatively simple analytical expressions for the amplification coefficient. We give an analysis of the effect of the longitudinal field on the efficiency with which the electron energy is transformed into radiative energy. 13 refs., 4 figs.
- OSTI ID:
- 183631
- Journal Information:
- Journal of Experimental and Theoretical Physics, Journal Name: Journal of Experimental and Theoretical Physics Journal Issue: 2 Vol. 81; ISSN JXTPAS; ISSN 1063-7761
- Country of Publication:
- United States
- Language:
- English
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