PTD vs. PO effects in power and polarisation of PLANCK HFI 100 beams

A method of accelerated computation of broadband far off boresight patterns of telescope beams is extended and applied to the 100 GHz channels of Planck HFI (HFI 100). Far off boresight angle power patterns are computed with both GRASP PTD and NUIM PO software, considering cuts with an angular size of 10 degrees. The former reveal secondary oscillations of radial power distribution as compared with the latter. The difference for power patterns of a/b polarisation channels is also investigated.
Comment: 4 pages, accepted for publication in PoS, CMB and Physics of the Early Universe, International Conference, Ischia, Italy, April 2006