systematicswg:telecons:2018-06-18:start [Probe Mission Study Wiki]

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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.
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