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[IEEE 2018 Conference on Precision Electromagnetic Measurements (CPEM 2018) - Paris, France (2018.7.8-2018.7.13)] 2018 Conference on Precision Electromagnetic Measurements (CPEM 2018) - The Simulations of the Effect of the External Field in the Joule Balance
摘要： Due to the movement of the main magnet, the effect of the external field is a critical problem in the joule balance. The FEM simulations of the external field both in the electromagnet system and permanent magnet system are performed in this paper. The results show that although the error caused by the external field is much smaller in the permanent magnet system than that in the electromagnet system, it still needs to be further reduced. More efficient solutions should be considered to eliminate the effect of the external field when the permanent magnet system is used.
关键词： external field,FEM simulation,Kibble balance,joule balance,the Planck constant
更新于2025-09-10 09:29:36
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[IEEE 2018 Conference on Precision Electromagnetic Measurements (CPEM 2018) - Paris, France (2018.7.8-2018.7.13)] 2018 Conference on Precision Electromagnetic Measurements (CPEM 2018) - The Status of the NIM-2 Joule Balance
摘要： The NIM-2 joule balance has been constructed since 2013 and was ready for measurement in vacuum by the end of 2016. In May of 2017, the first result obtained in vacuum with an uncertainty of 2.4×10-7 was submitted for publishing. The main uncertainty contributions are from the external field, alignment, mass calibration and others. To decrease these uncertainty contributions and get an uncertainty of 10-8 level, a series of approaches are presented here and will be performed in the near future.
关键词： magnet shielding,uncertainty,Measurement,joule balance,permanent magnet
更新于2025-09-10 09:29:36