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Title: Stable laser–plasma accelerators at low densities

We report stable laser wakefield acceleration using 17–50 TW laser pulses interacting with 4 mm-long helium gas jet. The initial laser spot size was relatively large (28 μm) and the plasma densities were 0.48–2.0 × 10{sup 19 }cm{sup −3}. High-quality 100–MeV electron beams were generated at the plasma density of 7.5 × 10{sup 18 }cm{sup −3}, at which the beam parameters (pointing angle, energy spectrum, charge, and divergence angle) were measured and stabilized. At higher densities, filamentation instability of the laser-plasma interaction was observed and it has led to multiple wakefield accelerated electron beams. The experimental results are supported by 2D particle-in-cell simulations. The achievement presented here is an important step toward the use of laser-driven accelerators in real applications.
Authors:
; ; ; ; ; ; ;  [1]
  1. Key Laboratory for Laser Plasmas (Ministry of Education) and Department of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240 (China)
Publication Date:
OSTI Identifier:
22308920
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 116; Journal Issue: 4; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ACCELERATION; ACCELERATORS; DENSITY; ELECTRON BEAMS; ENERGY SPECTRA; HELIUM; INSTABILITY; INTERACTIONS; JETS; LASER RADIATION; MEV RANGE 100-1000; PARTICLES; PLASMA DENSITY; PLASMA GUNS; PULSES; SIMULATION