Abstract
We investigate the pointing stability and the divergence of a quasi-monoenergetic electron beam
generated in a self-injected laser-plasma acceleration regime using high-Z gas-jet target. Gas-jet targets
have been irradiated with focused 40 fs laser pulses at the 4-TW peak power. A pointing stability and a
beam divergence of electron beam were improved using argon target. These values were about three
times smaller than at the optimum condition using helium. This stabilization method is available for
another gas material such as nitrogen. At nitrogen gas-jet target, the pointing stability is more improved
to two times smaller than that in argon gas-jet target and the peak energy is increased to > 30 MeV.
These results prove that this method not only stabilizes the e-beam but also allows controlling the
electron energy.
