The AIRIX accelerator is running with a 1.92 kA (single pulse 60ns) electron beam for two years. The optimisation of the beam transport has to minimise the transverse BBU oscillations and preserve the quality of the 20 MeV electron beam at the end of the accelerator. This minimisation needs, first, a very precise alignment. Secondly, the use of a higher axial magnetic field minimise also BBU oscillations. In that way, we have installed new power supplies to generate those fields. We present in this paper the results we obtained.We expose also the results we obtained with the adjunction of one more solenoïde between the injector and the accelerator.Those two actions have to simplify the beam transport at the 3.1kA. The different experiment we made at this higher current are also exposed.
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