At Lawrence Berkeley National Laboratory different antenna protection schem
es have been investigated for the radio frequency-driven multicusp ion sour
ce. It was found that the antenna lifetime can be greatly enhanced by an ad
ditional shielding, which consists of porcelain, quartz or boron nitride. D
ifferent antenna configurations and their influence on the plasma generatio
n will be discussed. Antenna life time greater than 500 hours continuous wa
ve operation has been demonstrated in hydrogen plasma using a novel quartz
antenna design. [S0034-6748(00)54202-6].