A new magnet design for future Kibble balances

Published

April 4, 2018

Author(s)

Stephan Schlamminger, Shisong Li, Michael Stock

Abstract

We propose a new permanent magnet system for Kibble balance experiments, which combines advantages of the magnet designs invented by the National Physical Laboratory (NPL) and by the Bureau International des Poids et Mesures (BIPM). The goal of the proposed magnet system is to realize a Kibble balance magnet with zero coil-current effect and good shielding at the same time. A permanent magnet system with two gaps each housing a coil is employed in the proposed design to minimize the coil current effect. Both air gaps of the magnet are completely surrounded by high-permeability material, and hence the coils are shielded from outside magnetic fields and consequently, no magnetic field leaks outside the magnet system. An example of the new magnet system is given and the analysis shows that the magnetic field in the air gap can be optimized to meet the requirement to be used in Kibble balances.

Citation

Metrologia

Volume

55

Issue

3

Pub Type

Journals

Keywords

Kibble balance, magnet, new SI

Citation

Schlamminger, S. , Li, S. and Stock, M. (2018), A new magnet design for future Kibble balances, Metrologia, [online], https://dx.doi.org/10.1002/DOI: 10.1088/1681-7575/aab2ea, DOI: 10.1088/1681-7575/aab2ea (Accessed October 13, 2025)