|Title||Influence of Multiple Electron-Scattering on the Gain in a Gas-Loaded Free-Electron Laser|
|Publication Type||Journal Article|
|Year of Publication||1995|
|Authors||V.V Goloviznin, P.W van Amersfoort|
|Journal||Physical Review E|
We present an analysis of the small-signal gain in the gas-loaded free-electron laser. Multiple scattering of electrons by the atoms of the gas inside the optical cavity is shown to lead to two additional effects, as compared to the case of a vacuum free-electron laser: a loss of coherence between different parts of the electron trajectory and an enhancement of the phase ''jitter.'' Both effects become increasingly important at short wavelengths and significantly reduce the small-signal gain per pass. In one-dimensional approximation, analytical expressions are obtained and numerical calculations are made to estimate the beam and undulator parameters necessary for lasing in the vacuum ultraviolet.
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