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Demonstration of a narrow energy spread, ∼0.5 GeV electron beam from a two-stage laser wakefield accelerator. 2011
B B Pollock, and
C E Clayton, and
J E Ralph, and
F Albert, and
A Davidson, and
L Divol, and
C Filip, and
S H Glenzer, and
K Herpoldt, and
W Lu, and
K A Marsh, and
J Meinecke, and
W B Mori, and
A Pak, and
T C Rensink, and
J S Ross, and
J Shaw, and
G R Tynan, and
C Joshi, and
D H Froula
Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94550, USA. pollock6@llnl.gov
Laser wakefield acceleration of electrons holds great promise for producing ultracompact stages of GeV scale, high-quality electron beams for applications such as x-ray free electron lasers and high-energy colliders. Ultrahigh intensity laser pulses can be self-guided by relativistic plasma waves (the wake) over tens of vacuum diffraction lengths, to give >1 GeV energy in centimeter-scale low density plasmas using ionization-induced injection to inject charge into the wake even at low densities. By restricting electron injection to a distinct short region, the injector stage, energetic electron beams (of the order of 100 MeV) with a relatively large energy spread are generated. Some of these electrons are then further accelerated by a second, longer accelerator stage, which increases their energy to ∼0.5 GeV while reducing the relative energy spread to <5% FWHM.
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