A Kelvinox 400 dilution refrigerator with the ability to load samples ontothe mixing chamber from the bottom of the cryostat has been combined with anultrahigh-vacuum (UHV) deposition chamber equipped with molecular beam sources.The liquid helium cooled sample transfer mechanism is used in a manner thatallows films to be grown on substrates which are kept at temperatures of order8K with chamber pressures in the 10^-9 to 10^-10 Torr range. This systemfacilitates the growth of quench-condensed ultrathin films which must always bekept below ~ 12K in a UHV environment during and after growth. Measurements canbe made on the films down to millikelvin temperatures and in magnetic fields upto 15 T.
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