CONSTRUCTION AND DEVELOPMENT OF THE JAERI 18 GHZ ELECTRON-CYCLOTRON-RESONANCE ION-SOURCE

An 18 GHz electron cyclotron resonance ion source for multiply charged ions was constructed and is now in operation. A new distribution of t he mirror field was adopted, and minimum strength is varied by a solen oid coil installed between the mirror coils. The measured mirror field distribution is close to the designed distribution and its maximum st rength exceeds 1.4 T. The source is now being tuned by use of Ar ion g eneration. The relatively high base pressure in the plasma chamber has been improved by installing an additional vacuum pump. The source per formance has been maturing gradually with the vacuum and Ar ions with charge states of up to 13+ have been observed so far. (C) 1996 America n Institute of Physics.