Title :
Construction and performance of the NIST-4 magnet system
Author :
Seifert, Frank ; Panna, Alireza ; Li, Sinan ; Han, Bo ; Chao, Leon S. ; Cao, Austin ; Haddad, Darine ; Choi, Hyo-Sang ; Haley, Lori ; Schlamminger, Stephan ; Pratt, Jon R.
Author_Institution :
Joint Quantum Inst., Univ. of Maryland, Gaithersburg, MD, USA
Abstract :
A watt balance is a promising instrument to realize the unit of mass at the kilogram level. The magnet system is one of the key elements of such an instrument. For the new watt balance currently under construction at the National Institute of Standards and Technology, a permanent magnet system was chosen. We describe the construction of the magnet system, first measurements of the field profile, and techniques that were used to achieve an ideal field profile.
Keywords :
balances; mass measurement; permanent magnets; NIST-4 magnet system; field profile; mass unit; permanent magnet system; watt balance; Coils; Iron; Magnetic noise; Magnetic separation; Magnetic shielding; NIST; Superconducting magnets; Planck constant; mass; mass metrology; permanent magnet; watt balance;
Conference_Titel :
Precision Electromagnetic Measurements (CPEM 2014), 2014 Conference on
Conference_Location :
Rio de Janeiro
Print_ISBN :
978-1-4799-5205-2
DOI :
10.1109/CPEM.2014.6898413
