Articlehybrid2019

Magnet System for the Quantum Electromechanical Metrology Suite

Rafael R. Marangoni · Darine Haddad · Leon Chao · Stephan Schlamminger

14 citations0/0 files storedIEEE Transactions on Instrumentation and Measurement

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Scientific Measurement and Uncertainty Evaluation Advanced Measurement and Metrology Techniques Advanced Electrical Measurement Techniques

Abstract

The design of the permanent magnet system for the new quantum electromechanical metrology suite (QEMMS) is described. The QEMMS, developed at the National Institute of Standards and Technology (NIST), consists of a Kibble balance, a programmable Josephson voltage standard, and a quantum Hall resistance standard. It will be used to measure masses up to 100 g with relative uncertainties below 2 × 10-8. The magnet system is based on the design of the NIST-4 magnet system with significant changes to adopt to a smaller Kibble balance and to overcome known practical limitations. Analytical models are provided to describe the coil-current effect and model the forces required to split the magnet into two parts to install the coil. Both models are compared to simulation results obtained with finite-element analysis and measurement results. Other aspects such as the coil design and flatness of Bl profile are considered.

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2016The watt or Kibble balance: a technique for implementing the new SI definition of the unit of mass 2019The revision of the SI—the result of three decades of progress in metrology 2017Measurement of the Planck constant at the National Institute of Standards and Technology from 2015 to 2017 2014Construction, Measurement, Shimming, and Performance of the NIST-4 Magnet System 2018The Planck-Balance—using a fixed value of the Planck constant to calibrate E1/E2-weights 2012Design of the Permanent-Magnet System for NIST-4 2017Coil-current effect in Kibble balances: analysis, measurement, and optimization 2018Preliminary Planck constant measurements via UME oscillating magnet Kibble balance

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