Laser guiding at relativistic intensities and wakefield particle acceleration in plasma channels
Electron beams with hundreds of picoCoulombs of charge in percent energy spread at above 80 MeV, and with few milliradian divergence, have been produced for the first time in a high gradient laser wakefield accelerator by guiding the drive laser pulse. Channels formed by hydrodynamic shock were used to guide acceleration relevant laser intensities of at least 1E18W/cm2 at the guide output over more than 10 Rayleigh lengths at LBNL's l'OASIS facility (10TW, 2E19W/cm2). The pondermotive force of the laser pulse drove an intense plasma wave, producing acceleration gradients on the order of 100 GV/m. Electrons were trapped from the background plasma and accelerated. By extending the acceleration length using the guiding channel, the energy of the electron beam was greatly increased, and bunches of small energy spread and low emittance were formed. Experiments varying gas jet length as well assimilations indicate that the high quality beams were formed when beam loading turned off injection after an initial load, producing an isolated bunch, and when that bunch was subsequently accelerated to the dephasing length at which point it rotated in phase space to produce low energy spread.
- Research Organization:
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Sponsoring Organization:
- USDOE Director. Office of Science. Office of High Energy and Nuclear Physics. Division of High Energy Physics, Office of Advanced Scientific Computing Research. Scientific Discovery through Advanced Computing Program; Hertz Foundation (US)
- DOE Contract Number:
- AC03-76SF00098
- OSTI ID:
- 836675
- Report Number(s):
- LBNL-56157; R&D Project: 455401; TRN: US0500777
- Resource Relation:
- Conference: The 11th Advanced Accelerator Concepts Workshop 2004, Stony Brook, NY (US), 06/21/2004--06/26/2004; Other Information: PBD: 1 Aug 2004
- Country of Publication:
- United States
- Language:
- English
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