Go to the U of M home page
School of Physics & Astronomy
Probe Mission Study Wiki

User Tools

Trace:
systematics_wg_july_26_2017

Differences

This shows you the differences between two versions of the page.

Link to this comparison view

Both sides previous revisionPrevious revision
Next revision		Previous revision
systematics_wg_july_26_2017 [2017/07/26 11:00] – bcrillsystematics_wg_july_26_2017 [2017/07/26 15:30] (current) – bcrill
Line 1: Line 1:
 Agenda/Notes from Systematics WG telecon July 26 2017 Agenda/Notes from Systematics WG telecon July 26 2017
  
-on the call: Maurizio, Paolo, Brendan+on the call: Maurizio, Paolo, Brendan, Colin, Ranajoy, Shaul
  
 1. Review CORE systematics paper (Paolo) 1. Review CORE systematics paper (Paolo)
 https://arxiv.org/pdf/1707.04224.pdf https://arxiv.org/pdf/1707.04224.pdf
 +  * Used the LBL TOAST tools (Kisner, Keskitalo, Borrill et al): flexible tool for generating timestreams
 +  * 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. 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_2017.1501084826.txt.gz · Last modified: 2017/07/26 11:00 by bcrill

Page Tools