Improvement of the dynamic phase measurement noise of the LNE Kibble balance by the implementation of a linear motor

The determination of a mass value in a Kibble balance type experiment requires the determination of the geometric factor of the magnetic circuit - coil set by two different methods. One of these phases requires the simultaneous acquisition of voltage and speed, the associated measurement noise must be reduced to the lowest possible value. This paper presents the improvement in the signal-to-noise ratio of the geometric factor by replacing the existing screw motor with a linear motor. The noise of the geometrical factor is reduced by a factor of five, which ultimately decreases the noise associated with the determination of the value of a mass in the LNE Kibble balance by a factor of five.