Current measurement system utilizing cryogenic techniques for the absolute measurement of the magnetic flux quantum

Author

Endo, Tadashi ; Murayama, Yasushi ; Sakamoto, Yasuhiko ; Sakuraba, Toshiaki ; Shiota, Fuyuhiko

Author_Institution

Electrotech. Lab., Ibaraki, Japan

Volume

38

Issue

2

fYear

1989

fDate

4/1/1989 12:00:00 AM

Firstpage

229

Lastpage

232

Abstract

A series of systems composed of cryogenic devices such as a Josephson potentiometer and a cryogenic current comparator, developed to precisely measure a current with any value up to 1 A, is proposed. These systems will be used to measure the injected electrical energy with an uncertainty of the order of 0.01 p.p.m. or less in the absolute measurement of the magnetic flux quantum by superconducting magnetic levitation. Some preliminary experiments are described

Keywords

Josephson effect; constants; cryogenics; electric current measurement; magnetic flux; magnetic levitation; superconducting junction devices; 1 A; Josephson potentiometer; absolute measurement; cryogenic current comparator; electric current measurement; magnetic flux quantum; superconducting magnetic levitation; Cryogenics; Current measurement; Electric variables measurement; Energy measurement; Frequency; Josephson junctions; Laboratories; Magnetic flux; Magnetic levitation; SQUIDs;

fLanguage

English

Journal_Title

Instrumentation and Measurement, IEEE Transactions on

Publisher

ieee

ISSN

0018-9456

Type

jour

DOI

10.1109/19.192277

Filename

192277