Last 3 years of the SC-ISOLDE and move to PS-Booster

<!--HTML-->In 1987 the very successful operation of ISOLDE-2 could be continued with an ever increasing number of users. The ISOLDE-3 facility was finished in 1988 and made available too, even in high-resolution mode. As it was evident that post-acceleration of the radioactive beams would be needed in the future, a first project with a series of linacs was forwarded. It had been clear, however, that CERN could not support the SC operation in the long term. An envisaged transfer to the Rutherford-Appleton Lab did not materialize, primarily for financial reasons. Fortunately the CERN management agreed to support a move to the PS-Booster and preparations started immediately following this decision. Thus in the years 1989 and 1990 a special effort was made to supply beam to as many research projects as possible, resulting in a record number of beam shifts from the ISOLDE separators. The collaboration even had to partially support the last year of SC running before the final shutdown in December 1990.