Title :
High-temperature superconductor cryogenic current comparator
Author :
Elmquist, R.E. ; Dziuba, R.F.
Author_Institution :
Electr. Div., Nat. Inst. of Stand. & Technol., Gaithersburg, MD, USA
fDate :
4/1/1995 12:00:00 AM
Abstract :
NIST is developing a cryogenic current comparator (CCC) to operate at 77 K, using high-temperature superconductor (HTS) ceramic shielding material and an HTS-based superconducting quantum interference device (SQUID) detector. The shielding properties of at least two polycrystalline oxide HTS materials appear sufficient for use in a high-accuracy CCC. A measurement of current-linkage error, a figure of merit for CCC devices, is made for one type of HTS CCC. The design of a second HTS CCC which uses improved magnetic shielding is described
Keywords :
SQUIDs; barium compounds; calcium compounds; cryogenic electronics; current comparators; high-temperature superconductors; magnetic shielding; measurement standards; strontium compounds; yttrium compounds; 77 K; Ba2Sr2CaCu3O8; NIST; SQUID; ceramic shielding material; cryogenic current comparator; current-linkage error; figure of merit; high-temperature superconductor; magnetic shielding; polycrystalline oxide; shielding properties; superconducting quantum interference device detector; Ceramics; Cryogenics; Detectors; High temperature superconductors; Interference; Magnetic materials; NIST; SQUIDs; Superconducting devices; Superconducting materials;
Journal_Title :
Instrumentation and Measurement, IEEE Transactions on
