PFC / JA - 92 - 17 Theory of Electron Cyclotron Resonance Laser
نویسنده
چکیده
The cyclotron resonance laser (CRL) accelerator is a novel concept of accelerating continuous charged-particle beams to moderately or highly relativistic energies. This paper discusses prospects and limitations of this concept. In particular, the nonlinear coupling of an intense traveling electromagnetic wave with an electron beam in a guide magnetic field is studied, and the effects of wave dispersion on particle acceleration are analyzed. For a tenuous beam, it is shown in a single-particle theory that the maximum energy gain and the maximum acceleration distance for the beam electrons in CRL accelerators with optimal magnetic taper exhibit power-law scaling on the degree of wave dispersion (measured by the parameter w/ckjj 1). The maximum energy gain is found to be independent of the wave amplitude, and the accelerating gradient is proportional to the wave amplitude. A self-consistent multiparticle model, which confirms the validity of the scaling laws, is used to study the characteristics of CRL accelerators in moderately high-current, microwave regimes. The parameter regimes of experimental interest are identified. The possibility of building continuous-wave (CW) CRL accelerators is discussed. Finally, the results of simulation modelling of a multi-megavolt, X-band, electron CRL accelerator are presented. PACS number: 07.77.+p
منابع مشابه
Pfc/ja-85-4 Free Electron Laser or Cyclotron Maser Instability?
An analysis of recent free electron laser experiments in combined wiggler and strong axial magnetic fields shows that near resonance, Q,,=kwv,,, the proximity of the cyclotron maser instability precludes an unambiguous identification of the radiation mechanism ( 2,, is the cyclotron frequency in the axial field, kw is the wiggler wavenumber, and v,, the axial electron velocity).
متن کاملPfc/ja-83-13 Parametric Phenomena in Electron Cyclotron Resonance Heating of Tokamak Plasmas
A theoretical study of parametric processes near the electron cyclotron resonance region in tokamak plasmas is presented. Parametric dispersion relations, including finite wave length of the driver pump, of principal and harmonic parametric excitations, are given. The problem of primary and secondary decays including their temporal and spatial growth rates is studied. In the nonlinear phase of ...
متن کاملPfc/ja-90- 44 Linear and Nonlinear Theory of Cyclotron Autoresonance Masers with Multiple Waveguide Modes
The interaction of multiple waveguide modes with a relativistic electron beam in an overmoded, single-frequency, cyclotron autoresonance maser amplifier is analyzed using a nonlinear self-consistent model and kinetic theory. It is shown analytically, and confirmed by simulation, that all of the coupled waveguide modes grow at the spatial growth rate of the dominant unstable mode, but suffer dif...
متن کاملPrinprint PFC/JA-83-17 VELOCITY DIAGNOSTICS OF MILDLY RELATIVISTIC, HIGH CURRENT ELECTRON BEAMS
We describe two diagnostic methods for measuring the velocity of mildly relativistic, high current electron beams. The first involves a measurement of the radial electrostatic potential and of the beam current and yields the time resolved, spatially averaged axial beam velocity v,,. The second requires a measurement of the beam cyclotron wavelength in the guiding magnetic field and yields the p...
متن کامل