A 3He/4He dilution refrigerator is described where the instreaming 3He is precooled and liquefied by a counterflow heat exchanger which makes use of the enthalpy of the cold 3He gas pumped out of the still, and by subsequent Joule-Thomson expansion. This condenser replaces the usual 4He condenser.
A dilution refrigerator without pumped He4 bath
β Scribed by A.Th.A.M. de Waele; A.B. Reekers; H.M. Gijsman
- Publisher
- Elsevier Science
- Year
- 1977
- Tongue
- English
- Weight
- 240 KB
- Volume
- 17
- Category
- Article
- ISSN
- 0011-2275
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β¦ Synopsis
This condensation stage has the great advantage, that the dilution refrigerator can work without a separate 1 K stage (for example, a cold plate or a pumped He 4 bath). This one dispenses with a pumping line and a rotary pump. This stage is ideally suited for runs of long duration.
π SIMILAR VOLUMES
A refrigerator capable of operating both in evaporation and dilution modes is described. The refrigerator provides preliminary cooling of investigated samples down to a starting temperature of about 0.3 K and permits the location of samples directly in the mixing chamber as well as their replacement
torque on the tight contacts improved the contact resistances from values between 5 and I0 /~ to values between 1 and 2/zQ. 6 Tests with variable forces on the contacts were also carried out. The effect of the force was not reversible and the results for a particular force depended on whether the le