Minipermanent magnet high-current microwave ion source

A 2.45 GHz high-current microwave ion source with permanent magnet was developed at Peking University. The source body is about 10 cm in diameter and 10 cm in height, and its weight is less than 5 kg. It can operate in both pulse and continuous wave (cw) modes. In pulse mode, more than 100 mA hydrogen ion current was extracted from a 5 mm ion extraction aperture, when the microwave power is 500 W and the extraction voltage is 45 kV, which corresponds to a beam density of 500 mA/cm2. In cw mode, up to 60 mA of hydrogen ion current can be extracted, and the beam density is 300 mA/cm2 at the same conditions. The proton ratio is about 80% and the normalized root-mean-square emittance is less than 0.1π mm mrad in both modes