A LARGE DILUTION REFRIGERATOR FOR POLARIZED TARGET EXPERIMENTS

Authors
BERGLUND P KYYNARAINEN J NIINIKOSKI TO
Citation
P. Berglund et al., A LARGE DILUTION REFRIGERATOR FOR POLARIZED TARGET EXPERIMENTS, Cryogenics, 34, 1994, pp. 235-238
Citations number
2
Categorie Soggetti
Physics, Applied",Thermodynamics
Journal title
Cryogenics → ACNP
ISSN journal
00112275
Volume
34
Year of publication
1994
Supplement
ICEC
Pages
235 - 238
Database
ISI
SICI code
0011-2275(1994)34:<235:ALDRFP>2.0.ZU;2-X
Abstract
The refrigerator for the SMC polarized target at CERN (NA47) is by far the largest dilution refrigerator in operation for this purpose. The target is loaded cold, horizontally into the mixing chamber, which is sealed with a cold indium seal. In ''frozen'' mode a circulation of 30 mmol/s gives a base temperature of 30 mK. A proton target is polarize d to 90% at 300 mK with a circulation of 180 mmol/s.