Patent ID: 7378847

Claim:
An NMR cryogenic probe comprising: a) a cryostatic enclosure, said enclosure comprising a bore for accommodating a sample under study; b) an RF coil for coupling to said sample, c) a cold head disposed within said enclosure for thermally supporting an RF coil said cold head comprising a first heat exchanger for establishing a desired temperature T 1 −ΔT for said RF coil; d) a heater for supplying heat sufficient to adjust the temperature of said RF coil to T 1 , and e) a cryo-pumping surface within said enclosure, said surface at least partially disposed proximate said cold head for stabilizing residual gas on said surface and comprising a second heat exchanger for maintaining said surfaces at selected temperatures T o< T 1 , said second heat exchanger being thermally independent of said first heat exchanger.