Gain and Efficiency Enhancement in Free Electron Laser by Means of Modulated Electron Beam

Vivek Beniwal (1) , Suresh C. Sharma (2) , Satoshi Hamaguchi (3)

1 Department of Physics
2 Department of Physics
3 Science and Technology Center for Atoms, Molecules and Ions Control

Beam premodulation on free electron laser (FEL) offers considerable enhancement in gain and efficiency when the phase of the premodulated beam is -π/2 and the beam is highly modulated implying the maximum beam oscillatory velocity due to wiggler. The growth rate of the FEL instability increases with the modulation index and reaches maximum when the modulation index $\Delta \sim 1.0$.

Mots clés: FEL; Wiggler; Gain; Efficiency

Domaines: Physique des plasmas [physics.plasm-ph]

Vivek Beniwal, Suresh C. Sharma, Satoshi Hamaguchi. Gain and Efficiency Enhancement in Free Electron Laser by Means of Modulated Electron Beam. 2004. ⟨hal-00001693⟩