Enhancement of the Stability for an Electron Beam by Using a Two-frequency Wiggler in a Free-electron Laser

초록

The stability of an electron beam is important to improve the radiation power, gain, and efficiency, and it becomes low grade due to the high wiggler magnetic field and self-generated fields in a high power free-electron laser. To enhance the stability of the electron beam, a two-frequency wiggler is used. We investigate the effects of self-generated fields for enhancing the stability of the electron beam for a two-frequency wiggler with an axial-guide magnetic field. To analyze the phase space of the electron motion in a field configuration consisting of a two-frequency wiggler magnetic field, a uniform axial-guide fields, and a self-generated fields, we apply the guiding-center variables, and we optimize the two-frequency wiggler parameters by using the numerical simulations from an extended Hamiltonian.

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