Coupling of longitudinal and transverse motion of accelerated electrons in laser wakefield acceleration

Reitsma, A.J.W. and Jaroszynski, D.A. (2004) Coupling of longitudinal and transverse motion of accelerated electrons in laser wakefield acceleration. Laser and Particle Beams, 22 (4). pp. 407-413. ISSN 0263-0346

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Abstract

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.