Recent Development of High Temperature Metal Targets for ISOLDE

摘要

Pure metals are among the most successful target materials for on-line mass separators. In particular, solid targets of refractory metals are excellent for this kind of use since they release no impurities which may interfere with the functioning on an ion source. In the present paper, we will describe the latest development of ISOLDE ion sources and their combination with a number of new metallic target materials and outline the current and potential performance of the new systems. The ISOLDE mass separators are situated at the CERN synchro-cyclotron (SC), which provides a 910 MeV sup 3 He beam and a 600 MeV proton beam which may reach an intensity of 4 microampere. Due to the long range of these projectiles, large amounts of target materials 10-300 g/cm sup 2 may be used at ISOLDE. The intensities of the secondary beams of unstable nuclei reaches 10 sup 11 atoms/s per microampere of incident proton beam. 25 refs., 11 figs. (ERA citation 12:008486)