Status report on the BIPM Kibble Balance

This paper reports the latest advances on the Kibble balance that the BIPM maintains for realizing the definition of the mass unit. The BIPM successfully participated in the first and second key comparisons of realizations of the kilogram, and carried out new measurements for the third one. Various refinements were made to the apparatus including the validation of the operation of a new PJVS array cooled inside a cryocooler. Characterization of the first prototype of a double-pan new beam mechanism was completed. An improved mechanism based on a single-pan beam balance has been designed and fabricated.