β Scribed by M. Adachi; E. Miura; S. Kato; K. Koyama; S. Masuda; T. Watanabe; A. Ogata; H. Okamoto; M. Tanimoto
No coin nor oath required. For personal study only.
We obtained a 7-MeV monoenergetic electron beam from a
plasma with the electron density n
~e~ of
1.5 Γ 10^20^ cm^-3^ produced by a 2-TW 50-fs laser pulse.
In both higher and lower sides of the density region of
4 Γ 10^19^β4 Γ 10^20^ cm^-3^, energy spectra of
electrons were bi-Maxwellian distribution function whose maximum
electron energy and effective electron temperature were 30 MeV and
approximately MeV, respectively. Observed first Stokes satellites
in the forward scattering light spectra, and the density
dependences of maximum electron energy and the effective
temperature suggest that electrons are first accelerated by SMLWFA
and are further accelerated by direct laser acceleration (DLA) in
the n
~e~ region of more than 2 Γ 10^20^ cm^-3^;
a cascade acceleration by SMLWFA and DLA. A Stokes satellite peak
observed with the monoenergetic beam suggests that the
monoenergetic beam would be accelerated by SMLWFA.
π SIMILAR VOLUMES
A system of nonlinear equations derived in a previous paper which describes the evolution of the beam-plasma instability in strong diesipative plasmas is solved numerically. It is shown that there are three characteristic solutions of the system of equations: the resonant dissipative instability, th