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- W2184456422 abstract "For a free-electron laser without inversion (FELWI), estimates of the threshold laser power are found. The largeamplification regime should be used to bring an FELWI above the threshold laser power. THRESHOLD FOR FELWI In a free-electron laser (FEL), coherent stimulated radiation is produced by the accelerated motion of electrons in the ponderomotive potential formed by the combined field of the wiggler and the electromagnetic wave. The socalled free-electron laser without inversion (FELWI) proposed recently [1]-[6] relies on the non-collinear arrangement of the electron and laser beams. An FELWI aims to improve performance of FELs and optical klystrons and to extend operation domain to shorter wavelengths. This is to be achieved by a two-wiggler design employing an advanced laser-induced electron phasing in the first wiggler. It reveals itself in the proportionality of the laser-induced changes of the electron energy and the laser-induced angular deviation of electron velocity, which is specific to the non-collinear interaction geometry of an electron beam a laser beam. Engineering of the angular-dependent electron path length in the drift region between the two wigglers makes it possible to tune most of the electrons exiting the first wiggler closer to the phase, which is favorable for efficient amplification in the second wiggler. As a result, an FELWI gain G becomes positive for almost every detuning Ω ≡ ω(v0 − vres)/c, which characterizes deviation of the electron velocity or the laser frequency from the resonance condition, Ω=0 : G(Ω)dΩ > 0 [1]-[6]. This amplification mechanism can only work if the laser-induced angular spread αof electrons in thefirst wiggler is essentiallylarger than the natural electron beam spread αbeam. The interaction of electron beam with laser field can be described by laws of conservation for momentum pe +" @default.
- W2184456422 created "2016-06-24" @default.
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- W2184456422 date "2011-01-01" @default.
- W2184456422 modified "2023-09-27" @default.
- W2184456422 title "ON THE PROBLEM OF THRESHOLD CHARACTERISTICS FOR FELWI" @default.
- W2184456422 hasPublicationYear "2011" @default.
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