Bayreuth nuclear demagnetization refrigerator

Journal Article · Sat Oct 01 04:00:00 EDT 1988 · J. Low Temp. Phys.; (United States)

DOI:https://doi.org/10.1007/BF00681746· OSTI ID:6056577

Gloos, K; Smeibidl, P; Kennedy, C; Singsaas, A; Sekowski, P; Mueller, R M; Pobell, F

The design, construction, and performance of a Cu nuclear refrigerator are reported. The first nuclear stage (total 275 moles Cu with 104 moles Cu in 8 T) has refrigerated a /sup 195/Pt NMR thermometer in the low-field experimental region to 15 ..mu..K; it can keep experiments below 20 ..mu..K for more than 1 week. It can alternatively precool a second nuclear stage (2 moles Cu in 9 T). Demagnetizing this stage has resulted in a temperature of at most 12 ..mu..K as measured by another /sup 195/Pt NMR thermometer attached to the stage. The details of the thermometry are described and possible origins of the observed internal heat leaks as well as unexpected contributions to the specific heat of the nuclear stages are discussed.

• Research Organization: Universitaet Bayreuth (Germany, F.R.)
• OSTI ID: 6056577
• Journal Information: J. Low Temp. Phys.; (United States), Journal Name: J. Low Temp. Phys.; (United States) Vol. 73:1-2; ISSN JLTPA
• Country of Publication: United States
• Language: English

Related Subjects

420201 -- Engineering-- Cryogenic Equipment & Devices
656002* -- Condensed Matter Physics-- General Techniques in Condensed Matter-- (1987-)
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ADIABATIC DEMAGNETIZATION
COOLING
COPPER
DAYS LIVING RADIOISOTOPES
DESIGN
ELEMENTS
ENERGY LOSSES
EVEN-ODD NUCLEI
FABRICATION
HEAT LOSSES
HEAVY NUCLEI
HELIUM DILUTION REFRIGERATION
INTERNAL CONVERSION RADIOISOTOPES
ISOMERIC TRANSITION ISOTOPES
ISOTOPES
LEAK TESTING
LOSSES
MAGNETIC MOMENTS
MAGNETIC RESONANCE
MEASURING INSTRUMENTS
METALS
NUCLEAR MAGNETIC MOMENTS
NUCLEAR MAGNETIC RESONANCE
NUCLEAR PROPERTIES
NUCLEAR SPECIFIC HEAT
NUCLEI
PERFORMANCE
PHYSICAL PROPERTIES
PLATINUM 195
PLATINUM ISOTOPES
RADIOISOTOPES
REFRIGERATION
REFRIGERATORS
RESONANCE
SPECIFIC HEAT
STABLE ISOTOPES
TEMPERATURE MEASUREMENT
TESTING
THERMODYNAMIC PROPERTIES
THERMOMETERS
TRANSITION ELEMENTS
ULTRALOW TEMPERATURE