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systematics_wg_july_26_2017 [2017/07/26 11:09] bcrillsystematics_wg_july_26_2017 [2017/07/26 15:30] (current) bcrill
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   * Used the LBL TOAST tools (Kisner, Keskitalo, Borrill et al): flexible tool for generating timestreams   * Used the LBL TOAST tools (Kisner, Keskitalo, Borrill et al): flexible tool for generating timestreams
   * simulated timelines fed into optimal mapmaking code (MADAM)   * simulated timelines fed into optimal mapmaking code (MADAM)
-  * Section 4: Started with checking whether clean reconstruction of polarization can be done with a space mission scan strategy and importantly, no modulator (i.e. rotating half waveplate); Fig 3: white-noise-only simulations showing correlation matricies+  * Section 4: Started with checking whether clean reconstruction of polarization can be done with a space mission scan strategy and importantly, no modulator (i.e. rotating half waveplate); Fig 3: white-noise-only simulations showing correlation matricies. 1e-2 reciprocal condition number (for IQU mixing matrix) set to be a limit: this tells you how hard it will be to reconstruct polarization: systematics make this reconstruction harder. 
 +  * noise knee frequency looked at: 10-20mHz is nearly white noise for ell<10.  Even 50 mHz, when averaged over many detectors, is not that bad (Fig 10). 
 +  * Section 5: Detector Crosstalk.  Generates bias in power spectrum, see Fig 11 
 +  * Section 6: Systematics: bandpass mismatch leakage from dust: projecting out at the mapmaking level (see Fig 13 for simulation of the effect and its correction for a 4-detector).  Edges of a tophat varied.  No consideration of synchrotron or CO or other discrete lines. 
 +  * Section 7: Asymmetric beams: corrected in two ways, real-space deconvolution and power-spectrum-level correction 
 +    * Real space deconvolution works very well, assuming effectively infinite S/N 
 +    * Harmonic space correction: QuickPol (also needs good S/N) 
 +  * Section 8: Calibration pipeline 
 +    * the CORE scan strategy, see Fig 19 for example, gives a much better dipole signal for calibration than the Planck scan strategy 
 +    * Galaxy-related systematics, assuming no correction, sets a "worst case" 
  
 2. Review Systematics List 2. Review Systematics List
 https://zzz.physics.umn.edu/ipsig/preliminary_list_of_systematic_effects_to_consider https://zzz.physics.umn.edu/ipsig/preliminary_list_of_systematic_effects_to_consider
 + * Everyone look at this list offline, we'll go through this in detail next week.
  
systematics_wg_july_26_2017.1501085382.txt.gz · Last modified: 2017/07/26 11:09 by bcrill