The ceramic-cup microwave ion source for sealed-tube neutron generator

A microwave proton source for sealed-tube neutron generator has been built in the radiation Technology Institute of Northeast Normal University. The p lasma resonance chamber is made of 95%Al2O3 ceramic material. The microwave absorption as a function of the magnetic field and the pressure is studied . The microwave absorption efficiencies, (P-i-P-r)/P-i are more than 90% wh en the magnetic field at the microwave windows is 0.095 T and incident micr owave power is 300-500 W, at the same time, the impedance between the micro wave circuit and the plasma source is well matched. Two-grid multi-hole ext raction electrodes are employed to extract ion. The maximum proton current of 30 mA is obtained when the extraction voltage is 5.4 KV and the incident microwave power is 300 W. (C) 2001 American Institute of Physics.