Evaluation of equilibrium trajectory of superconducting magnetic levitation system for the future kg unit of mass

Author

Shiota, Fuyuhiko ; Miki, Yukinobu ; Fujii, Yusaku ; Morokuma, Tadashi ; Nezu, Yoshiaki

Author_Institution

Nat. Res. Lab. of Metrol., Ibaraki, Japan

Volume

49

Issue

5

fYear

2000

fDate

10/1/2000 12:00:00 AM

Firstpage

1117

Lastpage

1121

Abstract

The superconducting magnetic levitation system for absolute determination of magnetic flux quantum Φ₀, which is aimed at the future replacement of the kilogram unit of mass, has been developed at the National Research Laboratory of Metrology (NRLM) with a small floating body of approximately 25 g mass. The consistency of the relation between potential energy of the floating body and the electromagnetic energy of the superconducting magnetic levitation system has been evaluated with 1 ppm order resolution. In this paper, the results of the evaluation as well as the improvements made in the apparatus in recent years at NRLM are described

Keywords

constants; magnetic levitation; mass measurement; superconducting magnets; units (measurement); 1 kg; NRLM; National Research Laboratory of Metrology; absolute measurement; electromagnetic energy; equilibrium trajectory; floating body; fundamental constants; kilogram unit; magnetic flux quantum; mass standard; potential energy; superconducting magnetic levitation; Current measurement; Energy resolution; Josephson junctions; Laboratories; Magnetic flux; Magnetic levitation; Metrology; SQUIDs; Superconducting coils; Superconducting microwave devices;

fLanguage

English

Journal_Title

Instrumentation and Measurement, IEEE Transactions on

Publisher

ieee

ISSN

0018-9456

Type

jour

DOI

10.1109/19.872940

Filename

872940