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beams_and_cl_1 [2018/07/13 04:13] – hivonbeams_and_cl_1 [2018/07/16 09:25] (current) – hivon
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 ====== Beams and C(l) ====== ====== Beams and C(l) ======
  
- --- //[[hivon@iap.fr|Eric Hivon]] 2018/07/13 03:56//+ --- //[[hivon@iap.fr|Eric Hivon]] 2018/07/16 09:09// 
 + 
 +[[systematicswg|Back to Systematics WG]]
    
 +=== 2018/07/16 ===
 +The beam computed at 150GHz, at a location offset by 10cm in the X (=co-scan) direction is now also available, on top of the central beam and Y=10cm beams generated earlier this month.\\
 +{{:systematicswg:maps_x10cm_feed_150ghz.png?direct&500}}
 +
 +Two different effects are now visible on the power spectra:
 +  * an overall rotation of the polarization by 1.74 deg, showing up as a strong EE to BB leakage when the full IQU beam is used instead of assuming a copolar beam (something we did **not** see in the (X,Y)=(0,0) and (0,10cm) cases)
 +  * the ell-dependent leakage from EE to BB seen previously is now larger than before.
 +
 +{{:systematicswg:w_qp_pico150_cxy_v1_picobeams.png?direct&500}}
 +{{:systematicswg:w_qp_pico150_cxy_pol_v1_picobeams.png?direct&500}}
  
 === 2018/07/13 === === 2018/07/13 ===
-Same exercise as on July 02, this time considering a beam at 150GHz located 10cm in the Y (=cross-scan ?) direction from the focal plane center (in a focal plane of 45cm in diameter).\\ +Same exercise as on July 02, this time considering a beam at 150GHz located 10cm in the Y (=cross-scan) direction from the focal plane center (in a focal plane of 45cm in diameter).\\ 
-We see this time a much larger contamination of BB, which looks like an ell-increasing leakage from EE to BB, probably due to the m=4 components of the beam map.+We see this time a much larger contamination of BB, which looks like an ell-increasing leakage from EE to BB, probably due to the m=4 components (=square-like shape) of the beam map. 
 +As for the central beam, the pure copolar and full IQU beam models return the same power spectra.
  
 {{:systematicswg:maps_y10cm_feed_150ghz.png?direct&500}} {{:systematicswg:maps_y10cm_feed_150ghz.png?direct&500}}
  
-{{:systematicswg:w_qp_pico150_cxy_v1_picobeams.png?direct&500}}+{{:systematicswg:w_qp_pico150_cxy_v1_picobeams_old.png?direct&500}}
  
 === 2018/07/02 === === 2018/07/02 ===
beams_and_cl_1.1531473202.txt.gz · Last modified: 2018/07/13 04:13 by hivon

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