The acceleration dynamics of electrons in a laser wakefield accelerator is discussed, in particular the coupling of longitudinal and transverse motion. This coupling effect is important for electrons injected with a velocity below the laser pulse group velocity. It is found that the electron bunch is adiabatically focused during the acceleration and that a finite bunch width contributes to bunch lengthening and growth of energy spread. These results indicate the importance of a small emittance for the injected electron bunch.
|Number of pages||6|
|Journal||Laser and Particle Beams|
|Publication status||Published - Dec 2004|
- beam quality
- electron dynamics
- plasma-based acceleration