A magnetically driven piston pump for xenon gas recirculation is presented.The pump is designed to satisfy extreme purity and containment requirements, asis appropriate for the recirculation of isotopically enriched xenon through thepurification system and large liquid xenon TPC of EXO-200. The pump, usingsprung polymer gaskets, is capable of pumping more than 16 standard liters perminute (SLPM) of xenon gas with 750 torr differential pressure.
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