High Quality Electron Bunches up to 1 GeV from Laser WakefieldAcceleration at LBNL Page: 1 of 7
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High Quality Electron Bunches up to 1 GeV
from Laser Wakefield Acceleration at LBNL
E. Esarey*t, B. Nagler*, A.J. Gonsalves", Cs. Toth, K. Nakamura*t,
C.G.R. Geddes, C.B. Schroeder*, J. van Tilborg*', S. Hooker**,
W.P. Leemans*t, E. Michelt, J. Caryl, and D. Bruhwilerl
*Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
tDepartnent of Physics, University of Nevada, Reno, NV 89557
"Department of Physics, University of Oxford, UK
t University of Tokyo, Japan
Technische Universiteit Eindhoven, the Netherlands
Tech-X Corp., Boulder, CO
Abstract. Experiments at the LOASIS laboratory of LBNL have demonstrated production of
100 MeV to 1 GeV electron bunches with low energy spread and low divergence from laser
wakefield acceleration. The radiation pressure of a 10 TW laser pulse, guided over 10
diffraction ranges by a few-mm long plasma density channel, was used to drive an intense
plasma wave (wakefield), producing electron bunches with energies on the order of 100 MeV
and acceleration gradients on the order of 100 GV/m. Beam energy was increased from 100
MeV to 1 GeV by using a few-cm long guiding channel at lower density, driven by a 40 TW
laser, demonstrating the anticipated scaling to higher beam energies. Particle simulations
indicate that the low energy spread beams were produced from self-trapped electrons through the
interplay of trapping, loading, and dephasing. Other experiments and simulations are also
underway to control injection of particles into the wake, and hence improve beam quality and
Keywards: laser, plasma, accelerator
Laser wakefield accelerators (LWFA) have demonstrated accelerating gradients
thousands of times those obtained in conventional accelerators using the electric field
of a plasma wave (the wakefield) driven by an intense laser [1-13], indicating the
potential for more compact accelerators. Early experiments demonstrated high
gradients, but electron beam energy and quality were limited until recently by the
difficulty of retaining high laser intensity over a long distance of propagation,
resulting in electron bunches with 100% energy spread and an exponentially small
fraction of electrons at high energy [2-8]. These experiments occurred in the self-
modulated regime  and relied on the self-guiding of the laser pulse which occurs for
powers greater than the critical power for relativistic self-focusing, Pe. The relativistic
quiver motion of the electrons increases their effective mass, changing the refractive
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Esarey, E.; Nagler, B.; Gonsalves, A.J.; Toth, Cs.; Nakamura, K.; Geddes, C.G.R. et al. High Quality Electron Bunches up to 1 GeV from Laser WakefieldAcceleration at LBNL, article, July 1, 2006; (https://digital.library.unt.edu/ark:/67531/metadc898223/m1/1/: accessed April 19, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.