On the call: Brendan, Eric, Julian, Ranajoy, Jacques, Colin

* S4 simulations: generation of map-based sims is ongoing. Validation of fisher forecasts looked fine in simplest cases. Now working on introducing effects that can't be done with a fisher forecast, such as more realistic foreground, more complicated noise. Eventually this effort might go to the time domain. Missing piece: way to scale from time domain to map domain to fisher (spectral) domain. Flauger is doing ILCs of map sims and then looking at spectra. Might want a fancier

• *

* what is probe-specific simulation plan

• * Lloyd and Data challenge group has been set up based on same sky being used for S4, using zeroth order frequencies
• * when using Probe, Planck, WMAP, etc..90 frequencies!!!!!
• * use tophat bands for and nominal tophat bands
• * plan to use fancier circular beams, using
• * will use Hensley/Draine dust modeling, Lazarian sync model using same underlying MHD
• * Kris has looked at one particular scan strategy for a probe (22,77..) and looked .

* look at Litebird whitepaper

• * Ted Kisner did a search through scan strategy parameter space against various metrics: Daily peak-to-peak dipole variation
• * noise properties vs. HWP, Core looked more at individual detectors.
• * look at with and without HWP