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While a high electron current electron beam ion source (EBIS) with high perveance has been proposed for its application at forthcoming TeV hadron colliders, an economical operation has been studied using oscillating electrons to reduce the collector current for low power consumptions. Results with oscillating electrons in our cryogenic EBIS with a 5 T magnetic focusing field are being discussed in relation to normal EBIS operation data considering the oscillation factor, current density, and ion yield. Our simplified EBIS/EBIT studies without magnetic focusing now span from a versatile source for the production of high current singly charged metallic ions up to the use of relativistic electron beams for the production of bare uranium. The XEBIST now works successfully with beam energies up to 10 keV. Barium ions having a charge state up to 46 have been extracted using evaporative cooling by Ar and residual gas. The extension to relativistic beam energies taking advantage of the self-focusing effect at partial space charge compensation will be presented elsewhere at this conference.

The accelerator for the REX-ISOLDE experiment at CERN 1 is a compact Linac, which will accelerate neutron rich nuclei with A q=4.5 to energies between 0.8 MeV and 2.2 MeV duty cycle: 10. Substantial components of the REX-ISOLDE Linac, such as the mass separator, the 4-Rod RFQ, the IH-matching section and the IH-drifttube-structure, are developed, built up and tested at Munich. The design and status of these components and the results of beam-and rf-power tests -especially with the RFQ and the IH-structure -are presented in this paper.

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