Quasimonoenergetic electron beam generation by using a pinholelike collimator in a self-modulated laser wakefield acceleration
- Center for Advanced Accelerators, Korea Electrotechnology Research Institute, Changwon 641-120 (Korea, Republic of)
A relativistic electron bunch with a large charge (>2 nC) was produced from a self-modulated laser wakefield acceleration configuration. For this experiment, an intense laser beam with a peak power of 2 TW and a duration of 700 fs was focused in a supersonic He gas jet, and relativistic high-energy electrons were observed from the strong laser-plasma interaction. By passing the electron bunch through a small pinholelike collimator, we could generate a quasimonoenergetic high-energy electron beam, in which electrons within a cone angle of 0.25 mrad (f/70) were selected. The beam clearly showed a narrow-energy-spread behavior with a central energy of 4.3 MeV and a charge of 200 pC. The acceleration gradient was estimated to be about 30 GeV/m. Particle-in-cell simulations were performed for comparison study and the result shows that both the experimental and simulation results are in good agreement and the electron trapping is initiated by the slow beat wave of the Raman backward wave and the incident laser pulse.
- OSTI ID:
- 21069761
- Journal Information:
- Physical Review. E, Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics, Vol. 73, Issue 1; Other Information: DOI: 10.1103/PhysRevE.73.016405; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 1063-651X
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
GENERAL PHYSICS
ACCELERATION
BEAM-PLASMA SYSTEMS
COLLIMATORS
COMPARATIVE EVALUATIONS
COMPUTERIZED SIMULATION
ELECTRON BEAMS
ELECTRONS
GEV RANGE
LASERS
LIGHT TRANSMISSION
MEV RANGE
PLASMA
PLASMA GUNS
PLASMA JETS
PULSES
RELATIVISTIC RANGE
TRAPPING
WAKEFIELD ACCELERATORS