Abstract
The design modifications to turn a commercial ultrahigh vacuum feedthrough into a sapphire insulated guarded and shielded unit are described. Feedthroughs thus modified performed well in transport and emission measurements and the impedance of the units approached 1016 Ω when the sapphire insulation was properly cleaned. Cleaning procedures and the coupling of these units to low capacitance rigid lines made from standard copper plumbing fittings are also described.
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