Abstract
We report on near-GeV electron beam generation from an all-optical cascaded laser wakefield accelerator (LWFA). Electron injection and acceleration are successfully separated and controlled in different LWFA stages by employing two gas cells filled with a mixture and pure He gas, respectively. Electrons with a Maxwellian spectrum, generated from the first LWFA assisted by ionization-induced injection, were seeded into the second LWFA with a 3-mm-thick gas cell and accelerated to be a 0.8-GeV quasimonoenergetic electron beam, corresponding to an acceleration gradient of . The demonstrated scheme paves the way towards the multi-GeV laser accelerators.
- Received 8 March 2011
DOI:https://doi.org/10.1103/PhysRevLett.107.035001
© 2011 American Physical Society