• Self-field effects on small-signal gain in two-stage free-electron lasers

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    • Keywords


      Relativistic electron beam; self-field effects; electromagnetic wiggler.

    • Abstract


      Self-field effects, induced by charge and current densities of the electron beam, on gain in two-stage free-electron laser with nonuniform guide magnetic field is presented. The gain equation for small-signal has been derived analytically. The results of numerical calculations show a gain decrement for group I orbits and a gain enhancement for group II orbits, due to the self-field effects. The wiggler-induced self-magnetic field has a diamagnetic effect for group I orbits, whereas for group II, it has a paramagnetic effect. It is also found that using a nonuniform guide field, rather than a uniform one, causes the gain to increase.

    • Author Affiliations


      S Jafari1 H Mehdian1 A Hasanbeigi1

      1. Department of Physics and Institute for Plasma Research, Tarbiat Moallem University, Tehran 15614, Iran
    • Dates

  • Pramana – Journal of Physics | News

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      Posted on July 25, 2019

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