Alkali Collimated Beam Source
Ultra-high vacuum compatible alkali atom beam source on a CF-133 compatible vacuum flange for attachment to customer vacuum system.
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Ultra-high vacuum compatible alkali atom beam source on a CF-133 compatible vacuum flange for attachment to customer vacuum system. The alkali source (rubidium or cesium standard) is supplied as an intact blown-glass ampoule sealed into the reservoir of the beam source. The ampoule is easily cracked by the customer after pumpdown and bakeout on the final vacuum system, to provide more than 100 mg of ultra-clean source material. Careful thermal design allows the beam source to provide high flux with very low background pressure. The output beam is collimated by an integrated ∅2.4 mm OD glass capillary array with 160:1 aspect ratio, resulting in an alkali atom beam with FWHM divergence typically below 60 mrad (~4°) spread, and a transverse velocity HWHM typically below 10 m/s. This beam can be used directly for alkali atomic beam experiments, or it can be used as the primary stage of a cold-atom system comprising downstream customer-supplied 2DMOT, 3DMOT, Zeeman cooling, and/or transverse laser-cooling stages. For such uses, careful material choices and counterwound in-vacuum heater design allow the combination of low residual DC magnetic fields, highly suppressed fields from the heater currents, and low outgassing even at elevated temperatures. An integrated in-vacuum collimator heater and a thermal break allows the glass capillary array to be differentially heated during beam operation, which keeps the alkali source localized in the back of the reservoir for long lifetime and UHV baseline pressures downstream. All electrical connections are terminated at a standard 10-pin connector, which can withstand a vacuum bake on the final chamber system without needing to be disconnected (see manual for temperature limits).
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