Effective parameter in extraction of ion-beam from a diode system

The effects of the gap distance between the electrodes and the extraction voltage on the spot, shape and the kinetic energy distribution of the argon ions were studied theoretically for a diode extraction system. The results showed that under specific conditions, a good focusing to ion- beam was found, where the dimensions of the ion spot were reduced by about 28.6% at gap distance 8 mm and extraction voltage -35 kV with best controlled for hitting ion to the extraction electrode. Also, a homogenous kinetic energy distribution of the beam can be found at distance between 10 mm and 25 mm.