Beam transport of 3.5 MeV foilless injector

The 3.5 MeV foilless injector is the electron source of dragon-Ⅰ linear induction accelerator(LIA). In beam tuning, the variety range of magnetic field is approximately determined by simulation. Based on the beam current waveforms at injector exit, the magnetic field profile of diode is decided by experiments. By measureing some beam parameters, the layout of magnetic field for the whole injector is obtained. The tuning experimental results show that this injector has achieved prospective guide line with an output beam energy of 3.5 MeV, a beam current of 2.8 kA and a normalized emittance of 1 040 mm·mrad.