A new FEBIAD-type ion source for use at the reactor-based ISOL facility TRISTAN

To use a FEBIAD-type ion source at a reactor-based on-line isotope separator facility, several modifications are desirable. Since more beam time is usually available at a reactor than at an accelerator, most of the changes to the ion source were those that make it possible to extend the source lifetime. The modifications described in this paper make it possible to operate a FEBIAD ion source for 1500 continuous hours without a failure. Beams of Zn, Ga, Ge, Br, Kr, Rb, Ag, Cd, In, Sn, Sb, Te, I, Xe, and Cs were obtained from the source and yields are presented for some of these elements. The effect of target outgassing on the operating conditions of the source are discussed and a Penning-ionization mode of operation is postulated.