  We report a laser wakefield acceleration of electron beams up to 130 MeV from
laser-driven 4-mm long nitrogen gas jet. By using a moderate laser intensity
(3.5*10^18 W.cm^(-2)) and relatively low plasma densities (0.8*10^18 cm^(-3) to
2.7*10^18 cm^(-3)) we have achieved a stable regime for laser propagation and
consequently a stable generation of electron beams. We experimentally studied
the dependence of the drive laser energy on the laser-plasma channel and
electron beam parameters. The quality of the generated electron beams is
discussed within the framework of the ionization-induced injection mechanism.
