Simulated polarisation performance (SKA1-Mid)

Needed to support system-CDR closeout. This ticket should therefore be viewed as a short very high priority time-boxed activity to provide required inputs for system CDR closeout, followed by a longer term lower priority activity to begin work toward developing the tools and simulation capability to perform an assessment of the expected polarisation performance of SKA1-MID.

Following the recommendation in the system-CDR report that the SKA devise and document a plan for achieving high polarisation dynamic range (40 dB for MID), we need to begin work to progress the analysis of the SKA1 polarisation performance though simulation.

To this aim, would like to address the following questions:

1. Assuming a simulation of SKA1-Mid with a perfect model of the dish behaviour (as a function of elevation), can we correct the off-axis polarisation response using A-projection or equivalent over a reasonable fraction of the Primary Beam?
2. If we no longer have a perfect model of the beam available for correction, what is the additional error introduced?

Stretch: Obtaining and report on experience from MeerKAT on how well holography compared to the finite element modelling.