A new radio-frequency (rf) discharge plasma source at frequency of 13.
56 MHz is presented. The rf plasma is produced by a modified magnetron
-typed rf discharge using a cylindrical electrode with permanent magne
t rings. The electron density of 2.5 x 10(10) cm-3 with an electron te
mperature of 3.7 eV, uniform within a few percent over 50 cm in diamet
er, is obtained on both sides at 5-6 cm from the axial center of the r
f electrode when the rf power is 600 W under argon pressure of 3.6 x 1
0(-4) Torr.