Position control for the MSL Kibble balance coil using a syringe pump

The position of the coil in a Kibble balance must be finely controlled. In weighing mode, remains stationary to maintain constant magnetic field. calibration is moved field induce voltage. MSL design based on twin pressure where attached piston one balances. Here we investigate how (and therefore coil) may controlled through careful manipulation gas column under piston. We demonstrate use syringe pump as programmable volume regulator which can provide fall rate compensation well motion show that damped harmonic oscillator response considered when moving coil. From this initial investigation, discuss implications for balance.