Ion-Ripple Laser as an advanced coherent radiation source

K. R. Chen, J. M. Dawson

Research output: Contribution to journalConference article


We describe the Ion-Ripple Laser[1] as an advanced scheme for generating coherent radiation. A relativistic electron beam obligately propagating through an ion ripple excites electromagnetic radiation which is coupled to slow electrostatic waves with peak growth rate at the resonance frequency w '-2-ykc via backward Raman scattering. This new scheme may provide novel tunable sources of coherent high-power radiation. By proper choice of device parameters, sources of microwaves, optical and perhaps even X-rays can be made. By employing fluid theory the dispersion relation for wave coupling is derived and used to calculate the radiation frequency and linear growth rate. The nonlinear saturation mechanism is due to trapping of the beam electrons by the ponderomotive potential. For an energetic electron beam, the peak growth rate is 5/2 . 3/4 3/2 . . 3/2 . Wi = Wpe E sm (2kc) ' and the efficiency is i= Wpe/(2kwC70 ). A 1 2/2 DPIC simulation code was developed to verify the ideas, scaling laws and nonlinear mechanism. From the observed power spectrum, backward Raman scattering is shown to be responsible for the radiation. The growth rates and efficiencies given by the simulation match the ones of theory for different wiggler wave length and beam y. Both of them show a slow decrease with momentum spread. Momentum spread also broadens the radiation spectrum.

Original languageEnglish
Pages (from-to)185-196
Number of pages12
JournalProceedings of SPIE - The International Society for Optical Engineering
Publication statusPublished - 1991 Dec 1
EventShort-Wavelength Radiation Sources 1991 - San Diego, United States
Duration: 1991 Jul 21 → …


All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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