A MICROWAVE DRIVEN OFF-LINE ION-SOURCE FOR ISAC AT TRIUMF

An off-line microwave ion source (TE111 mode resonator at 2.45 GHz) is being developed to produce stable ion beams for ISAC commissioning as well as to produce intermediate and long half-life radioactive ion be ams for initial experiments. Two different sources have been construct ed and tested. In the standard source configuration the microwave powe r is injected and the beam is extracted on axis. In the second source microwave power is injected radially. In this case, the beam is extrac ted radially. Each of the sources is capable of handling gaseous, meta llic and volatile compounds. A three electrode extraction system and a mass spectrometer with a resolution of 1600 are used to analyze the b eams. The performance of the two sources is compared. In a number of p arameters, efficiency, power requirements, tuning simplicity and lifet ime, the radial source out performs the axial source. The test results with both sources are present. (C) 1998 American Institute of Physics .