online: Eric, Brendan, Shaul, Maurizio

Agenda

• Updates
  • Do we have simulated main beams? Eric wants to take a look at the cross-polar beam.
  • Eric recently learned that in Litebird, the peak of the U beam for GRASP sims of the main beams is something like 10% of the peak of the I beam map. This is much larger than simulations for Planck HFI and LFI (which was < 1% peak) and was thus determined to not be a problem. Being very far off-axis might be the issue.
  • There are two effects: 1. Calibration will correct any “constant” effect. so how accurately do we need to calibrate? 2. to what effect I/Q/U beams maps are the same.
  • Can we find a main lobe GRASP simulation for PICO that we can look at? Eric can determine whether the cross-polar response can be corrected by a simple calibration factor. If it's a simple rotation, then no problem. But if there are extra terms, then we might need to have a different approach.
  • action to Eric: to describe this in more detail next week (building on his previous post).
  • action to Shaul: talk to Karl to look at main beam GRASP sim for two orthogonal detectors.
  • Maurizio worked with Andrea. Andrea using PICO as a test case for some “large focal plane” development for toast.
  • Maps are available for 2 year simulation requested by Kris: /scratch1/scratchdirs/tomasi/PICO_simulations/pico_4detectors_2yrs.fits input map is /global/cscratch1/sd/zonca/pico/cal_sims/pico_cmb_nodip.fits
  • Andrea was able to patch toast to bring in dacapo input. Allows gain estimation sims: 1. a map of the full sky reconstructed over 2 years and 4 detectors, 2. gain factors vs. time, and 3. a map that has the effects of residual gain errors.
  • Maurizio can use these products to compute angular power spectra and show the science impact of the residual gain errors. He will do this in the next few days.
• Systematics section outline
  • Shaul wants to have a draft PICO report by September 1. The real one will be submitted to NASA in December
  • Write a systematics paper? Is there anything particularly new in the PICO material?
    • ideas for Maurizio's scheme was somewhat explained in the CORE systematics paper. Some new elements regarding the end-to-end.
    • Eric's particular work is mostly a specific application of previous methods.
    • PICO has a different scanning strategy from Litebird and CORE.
    • Sidelobe pickup given the telescope is interesting: this is one that has never been used for a CMB project.
    • Brendan to make an outline for paper.
  • Note: Brendan to be on vacation for 2 weeks. will be back for July 9 telecon.
  • Eric will be gone Late July - early August.