Growth and Phase Velocity of Self-Modulated Beam-Driven Plasma Waves

C. B. Schroeder, C. Benedetti, E. Esarey, F. J. Grüner, W. P. Leemans
2011 Physical Review Letters  
A long, relativistic charged particle beam propagating in a plasma is subject to the self-modulation instability. This instability is analyzed and the growth rate is calculated, including the phase relation. The phase velocity of the accelerating field is shown to be significantly less than the drive beam velocity. These results indicate that the energy gain of a plasma accelerator driven by a self-modulated beam will be severely limited by dephasing. In the long-beam, strongly-coupled regime,
more » ... ephasing is reached in less than four e-foldings, independent of beam-plasma parameters.
doi:10.1103/physrevlett.107.145002 pmid:22107202 fatcat:36nipceovzdtrpo5ipyki3knhm