Preliminary Planck constant measurements via UME oscillating - magnet Kibble balance

TL;DR

This paper presents a novel oscillating magnet Kibble balance method for measuring the Planck constant, achieving high precision with simplified setup and minimal environmental dependence.

Contribution

It introduces a new approach using an oscillating magnet in a Kibble balance to measure the Planck constant more efficiently and with reduced complexity.

Findings

Planck constant measured as h/h_90=1.000004

Relative standard uncertainty of 6 ppm achieved

Method reduces environmental and setup sensitivities

Abstract

The UME Kibble balance project was initiated at the second half of 2014. During this period we have studied the theoretical aspects of Kibble balances in which an oscillating magnet generates AC Faraday voltage in a stationary coil and constructed a trial version to implement this idea. The remarkable feature of this approach is that it can establish the link between the Planck constant and a macroscopic mass by one single experiment in the most natural way. Weak dependences on variations of environmental and experimental conditions, small sizes and other useful features offered by this novel approach reduce the complexity of the experimental setup. This paper describes the principles of oscillating magnet Kibble balance and gives details of the preliminary Planck constant measurements. The value of the Planck constant determined with our apparatus is h/h_90=1.000004 with a relative standard uncertainty of 6 ppm.