  New spectral line polarisation observations of 7 bright Ap stars have been
obtained with the ESPaDOnS and Narval high resolution spectropolarimeters
(Silvester et al. 2012). The aim of this data set is produce a series of
surface magnetic field and surface chemistry maps for these Ap stars. We
present new magnetic maps for the Ap star $\alpha^2$ CVn using these new data
and the MDI inversion code INVERS10. $\alpha^2$ CVn is the first Ap star to be
observed during two separate epochs using high resolution phase resolved
spectropolarimetric $IQUV$ observations and as such allows us an insight into
how stable the surface magnetic structure is over a decade timescale. We show
that the new maps give a magnetic field structure consistent with the previous
maps obtained by Kochukhov and Wade (2010) from lower quality MuSiCoS spectra
taken a decade ago and that the field topology cannot be described by a dipolar
or quadrupolar field.
