NIST is developing a cryogenic current comparator (CCC) to operate at 77 K, using high-temperature superamductor (HTS) ceramic shields and a MS-based superconducting quantum interfaence device (SQUID) detector. HTS shielding at low magnetic field levels is probably sufficient for hlgh accuracy measurements. Unshielded sections of the ratio windings may produce a sigdicant error.
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