Current sensing noise thermometry: some recent improvements
The authors report preliminary measurements on several current sensing noise thermometers presently under study in the laboratory. The emphasis of the work is to produce a fast practical absolute thermometer that can be used over the entire temperature range from 4.2 K to 0.05 mK. A practical thermometer based on commercially available rf SQUIDs useful in the temperature range 4.2 K to 2 mK that allows a 1% determination of the absolute temperature with 200 sec of averaging the Johnson noise currents is demonstrated. A comparison of the Johnson noise temperature with the NBS low temperature fixed points is presented. A discussion of the improvements in noise thermometry that are currently possible and under development using low noise dc SQUIDS is given. 24 references, 7 figures, 2 tables.
- Research Organization:
- IBM T.J. Watson Research Lab., Yorktown Heights, NY
- OSTI ID:
- 6056300
- Report Number(s):
- CONF-830456-
- Journal Information:
- AIP Conf. Proc.; (United States), Journal Name: AIP Conf. Proc.; (United States) Vol. 103; ISSN APCPC
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
CRYSTALS
CURRENTS
DATA
DESIGN
ELECTRONIC EQUIPMENT
EQUIPMENT
EXPERIMENTAL DATA
FLUIDS
FLUXMETERS
IN CORE INSTRUMENTS
INFORMATION
INTERFEROMETERS
JOSEPHSON JUNCTIONS
JUNCTIONS
MEASURING INSTRUMENTS
MECHANICS
MEETINGS
MICROWAVE EQUIPMENT
NOISE THERMOMETERS
NUMERICAL DATA
PERFORMANCE
QUANTUM CRYSTALS
QUANTUM FLUIDS
QUANTUM MECHANICS
REACTOR INSTRUMENTATION
RF SYSTEMS
SOLIDS
SQUID DEVICES
SUPERCONDUCTING DEVICES
SUPERCONDUCTING JUNCTIONS
SUPERCONDUCTORS
THERMOMETERS
ULTRALOW TEMPERATURE