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Monoenergetic electron beam generation from a laser-plasma accelerator

Published online by Cambridge University Press:  06 March 2006

K. KOYAMA ,
M. ADACHI ,
E. MIURA ,
S. KATO ,
S. MASUDA ,
T. WATANABE ,
A. OGATA  and
M. TANIMOTO
K. KOYAMA
Affiliation:
National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Japan Graduate School of Engineering, Utsunomiya University, Utsunomiya, Japan
M. ADACHI
Affiliation:
Graduate School of Advanced Sciences of Matter, Hiroshima University, Higashi-Hiroshima, Japan
E. MIURA
Affiliation:
National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Japan
S. KATO
Affiliation:
National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Japan
S. MASUDA
Affiliation:
National Institute of Radiological Sciences (NIRS), Chiba, Japan
T. WATANABE
Affiliation:
Graduate School of Engineering, Utsunomiya University, Utsunomiya, Japan
A. OGATA
Affiliation:
Graduate School of Advanced Sciences of Matter, Hiroshima University, Higashi-Hiroshima, Japan
M. TANIMOTO
Affiliation:
Faculty of Physical Sciences and Engineering, Meisei University, Hino, Japan
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Abstract

We have demonstrated the acceleration of a monoenergetic electron beam by a laser-produced wakefield. Experiments were performed by focusing 2-TW laser pulses of 50 fs on supersonic gas-jet targets. The focused intensity was 5 × 1018 W/cm2 (a0 = 1.5). At an electron density of 1.5 × 1020 cm−3, the clear monoenergetic electron beam from the plasma was obtained at 7 to 15 MeV. The Stokes satellite peak in the forward scattering explained the energy spectra of electrons at various plasma densities well. Although the wakefield propagated 500 microns, which was far beyond the dephasing length, monoenergetic electron beams were obtained.

Keywords

DephasingForward scatteringLaser plasma acceleratorMonoenergetic accelerationSelf-modulated wakefield
Type
Research Article
Information
Laser and Particle Beams , Volume 24 , Issue 1 , March 2006 , pp. 95 - 100
Copyright
© 2006 Cambridge University Press

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