A simple, filament type, titanium sublimation pump is tested for its performance at ultrahigh vacuum. The pump consists of three individual Titanium-Molybdenum (80/20) alloy filaments of 2.1mm diameter each. The pump is enclosed in a clean ultrahigh vacuum chamber, with a thin-walled liquid nitrogen shroud around. Data on the pumping speed characteristics at various pressures with chilled water and liquid nitrogen cooling and the ultimate vacuum obtained in the system is presented. Analysis of pumping characteristics for different gases, in particular the pumping speed for Hydrogen, as measured from the reduction of partial pressures with a Quadrupole Mass Spectrometer is also highlighted.
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