A GENERATION OF UNCONVENTIONAL ELECTRON-BEAM ION SOURCES

While a high electron current electron beam ion source (EBIS) with hig h perveance has been proposed for its application at forthcoming TeV h adron colliders, an economical operation has been studied using oscill ating electrons to reduce the collector current for low power consumpt ions. 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 densit y, and ion yield. Our simplified EBIS/EBIT studies without magnetic fo cusing now span from a versatile source for the production of high cur rent singly charged metallic ions up to the use of relativistic electr on beams for the production of bare uranium. The XEBIST now works succ essfully 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 adva ntage of the self-focusing effect at partial space charge compensation will be presented elsewhere at this conference. (C) 1996 American Ins titute of Physics.