THE STOCKHOLM ELECTRON-BEAM ION-SOURCE

The electron beam ion source, CRYSIS, produces highly charged ions for injection into the heavy ion storage ring - CRYRING at the Manne Siegbahn Institute, and for low energy atomic physics experiments. It will also provide highly charged ions for the Stockholm-Mainz Penning trap scheduled for installation at MSI in early 1993. CRYSIS has produced ions up to Ar18+ and Xe-136(49+) using electron beam currents of typically I(e) = 200-300 mA and current density j(e) = 100-200 A/cm2. Continuous electron beams of energy E = 19 keV and current I(e) = 600 mA have been propagated through the source with transmission greater than 99.9%. Test beams of He-2+ and N7+ extracted from the source in 50 100 mus pulses have been injected into CRYRING with the entire CRYSIS platform raised to 20 kV. Ions of charge up to Xe-136(44+) extracted in extended 50-100 ms pulses have been used in coincidence-type atomic physics experiments. The status of CRYSIS as of March 15, 1992 is reported. Improvements, modes of operation, and results are discussed.