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- W2004285987 abstract "We present a quantum electrodynamic calculation of the gain associated with the stimulated emission and absorption of photons by high-energy electrons in the presence of a spatially periodic, static magnetic field. The calculation is relevant to the description of a high-energy electron laser in the long-interaction-length low-density (single-particle) regime. The different kinematic constraints imposed on the photon-emission and -absorption processes are shown to produce the effect of population inversion in an energetic electron beam which allows for a net gain in the number of photons produced per unit path length. The spectral dependence of the gain on the wave vector of the emitted photon has a width determined by the incident electron momentum distribution and a maximum in the vicinity of a $k$ value [$2{(frac{{W}_{10}}{m{c}^{2}})}^{2}(frac{2ensuremath{pi}}{{ensuremath{lambda}}_{0}})$] determined by the central electron momentum $frac{{W}_{10}}{c}$ and the spatial period of the magnetic field. Derived formulas for the gain and gain-minus-loss coefficients are compared with formulas obtained on the basis of the stimulated Comptonscattering model. While the separate gain and loss coefficients diverge in the limit $ensuremath{hbar}ensuremath{rightarrow}0$, the gain-minus-loss coefficient is shown to have a finite value in this limit which agrees with the result of a classical derivation." @default.
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- W2004285987 date "1982-07-01" @default.
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- W2004285987 title "Quantum theory of magnetic bremsstrahlung gain" @default.
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- W2004285987 doi "https://doi.org/10.1103/physreva.26.423" @default.
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