CONTINUOUSLY OPERATING DILUTION REFRIGERA TOR WITH ADSORPTION PUMPS

The main parts and the performance of two versions of the continuously operating dilution refrigerator with an adsorption pumping system ded icated to physical investigations at ultralow temperatures are describ ed. Compared to conventional dilution refrigerators these versions are more compact, economic and more vibration-proof. This type of dilutio n refrigerator allows a single shot operation to be realized. The mini mum temperature reached in a single continuous heat exchanger refriger ator is 18 mK for a continuous operation and 5-8 mK for a single shot are. On addition of four discrete heat exchangers, the minimum tempera ture for continuous operation reduces down to 8 mK.