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Design and Construction
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80 mil aperture alkali ion source angular divergence aperture electrode baseplate beam energy beam line beam tests BLITT calculated charge exchange collisions current density current reading David Adler decrease deionized water einzel lens emitter surface endcap energy spread equipotentials experimental extracted current extraction geometry extraction system Faraday cup feedthrough flange filament current fluorescent screen focussing gas source grid HEIS holes inch incident ion Induced X-ray Spectroscopy inner diameter ion beam Ion Scattering LEIS lens element machining Macor noble gas noble gas ions parameters piece Pierce electrode Pierce geometry quartz quartz tube ray tracing receptacles scattered ions secondary electrons secondary ions Shop drawing shown in Figure solid state source source holder source-aperture distance space charge curve space charge limited space charge spreading spectra Spectra-Mat sputtering stainless steel support rod surface atoms surface structure tantalum tantalum wire techniques temperature trajectories transmitted current ultra-high vacuum Universal Space Charge welded Wien filter