Planck Pre-Launch Status Papers - APC - Université Paris Diderot ...

A&A 520, A12 (2010)Fig. 19. Broad-band (68 frequencies) 545-2 multi-mode power beam.Bottom figure is on a different X-Y scale (both in degrees). Color scale:un-normalised gain. Contours in dB respectively to maximum.Table 9. Single-mode channels spillover calculations (in %).Fig. 20. Main beam intensity maps for the polarised detector 143-1a atthe central frequency of 143 GHz. Same caption than for Fig. 16.Pixel Measurement Ideal Worst case Medianfrequency spillover spillover spillover100-1a 100 GHz 0.36 0.42 0.39100-3a 100 GHz 0.29 0.43 0.36143-1a 143 GHz 0.32 0.45 0.38217-8a 240 GHz 0.24 0.43 0.33217-3u 240 GHz 0.24 1.08 0.66353-5a 308 GHz 0.07 0.08 0.075Notes. Only results for horn types showing some discrepancies betweenmodel and experimental power patterns are shown. The suffix “a”denotesthe beam associated with the a detector of a PSB while “u” isrelated to an unpolarised pixel.Table 10. Spillover calculations (in %) of the high frequency channelsassuming theoretical horn beam patterns.Channel Edge taper Angle Average Spilloverfrequency (deg) %545 GHz 26 0.3857 GHz 27 0.038. ConclusionsWe have described the design optimisation of the cold optics andof the focal plane unit of Planck-HFI. The measured optical performancesof the resulting instrument flight model are presented,together with beam simulations based on the perfect optical system.Fig. 21. Main beam intensity maps for the polarised detector 217-5a atthe central frequency of 217 GHz. Same caption than for Fig. 16.Page 14 of 15