An overview of the new developments in small cryocoolers at L'Air Liquide-DTA is presented. The results of a pulse tube refrigerator developed in collaboration with l'Ecole Normale Superieure, the first French laboratory which worked on this subject, are discussed. An original two flowrate flat Joule-Thomson cooler is extensively described. This last development shows the historic willingness of L'Air Liquide-DTA to be present in demand flow cryostat and fast cool-down systems for defense programs.
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