  Gaseous time projection chambers (TPC) are a very attractive detector
technology for particle tracking. Characterization of both drift velocity and
diffusion is of great importance to correctly assess their tracking
capabilities. NEXT-White is a High Pressure Xenon gas TPC with
electroluminescent amplification, a 1:2 scale model of the future NEXT-100
detector, which will be dedicated to neutrinoless double beta decay searches.
NEXT-White has been operating at Canfranc Underground Laboratory (LSC) since
December 2016. The drift parameters have been measured using $^{83m}$Kr for a
range of reduced drift fields at two different pressure regimes, namely 7.2 bar
and 9.1 bar. The results have been compared with Magboltz simulations.
Agreement at the 5% level or better has been found for drift velocity,
longitudinal diffusion and transverse diffusion.
