Journal
JOURNAL OF APPLIED PHYSICS
Volume 116, Issue 4, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4891987
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Funding
- National 973 Program of China [2013CBA01504]
- National Natural Science Foundation of China [11121504, 11175119, 11334013, 11374209]
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We report stable laser wakefield acceleration using 17-50 TW laser pulses interacting with 4mm-long helium gas jet. The initial laser spot size was relatively large (28 mu m) and the plasma densities were 0.48-2.0 x 10(19) cm(-3). High-quality 100-MeV electron beams were generated at the plasma density of 7.5 x 10(18) cm(-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. (C) 2014 AIP Publishing LLC.
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