Robust autoresonant excitation in the plasma beat-wave accelerator: a   theoretical study
  A modified version of the Plasma Beat-Wave Accelerator scheme is introduced and analyzed, which is based on autoresonant phase-locking of the nonlinear Langmuir wave to the slowly chirped beat frequency of the driving lasers via adiabatic passage through resonance. This new scheme is designed to overcome some of the well-known limitations of previous approaches, namely relativistic detuning and nonlinear modulation or other non-uniformity or non-stationarity in the driven Langmuir wave amplitude, and sensitivity to frequency mismatch due to measurement uncertainties and density fluctuations and inhomogeneities. 
R.R. Lindberg, A.E. Charman, J.S. Wurtele (Dept. of Physics, UC   Berkeley and Center for Beam Physics, LBNL), and L. Friedl...