Coupling of longitudinal and transverse motion of accelerated electrons in laser wakefield acceleration a
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.(Received January 12 2004)
(Accepted March 26 2004)
Key Words: Beam quality; Electron dynamics; Plasma-based acceleration.
c1 Address correspondence and reprint requests to: A.J.W. Reitsma, Department of Physics, Strathclyde University, John Anderson Building, 107 Rottenrow, G4 0NG Glasgow, United Kingdom. E-mail: email@example.com
a This paper was delivered at the International Workshop on Laser and Plasma Accelerators, held at Portovenere, Italy, September 29 to October 3, 2003.