# UChicago-2016: Cosmology with CMB-S4

## Welcome to the wiki for the Cosmology with CMB-S4 workshop at the University of Chicago September 19-21, 2016.

Please register here: Official Workshop Website: Program, Participants, Registration, Hotels, Logistics.

## Workshop overview

The first two days of the workshop are dedicated to CMB-S4. The third day will be an overlap day with the "Futures Cosmic Surveys", which is being held at Chicago September 21-23.

The CMB-S4 workshop will start with a review of the science case presented in the recently completed first edition of the CMB-S4 Science Book, followed by sessions dedicated to working on refining the science driven requirements for the CMB-S4 instrumental configuration.

We will review the set of instrumentation white papers, now being drafted, that summarize the current state of relevant technologies for CMB-S4 and identify R&D efforts to advance them for evaluation for possible use in CMB-S4. We will work on the road map to determine the instrumental configuration of CMB-S4.

The goal of the overlap day (Wednesday September 21) with the "Cosmic Surveys" workshop is for the two communities to update each other on their future plans and to explore the synergistic and joint analysis of the combined data sets.

As for the previous two workshops, we will use this wiki to organize the sessions and to capture the input from the sessions, and develop next steps. Initial page stubs will be provided for each break-out session. The wiki will be used during the break-out sessions, and also for the plenary session. Participants are encouraged to edit the wiki directly, including uploading plots or a few slides.

Hints for formatting this wiki can be found here: https://www.mediawiki.org/wiki/Help:Formatting

## Monday, September 19: Facts on the Ground (all plenaries)

• Science Book Chapter presentations
Charge for SB chapter sessions:
- Science highlights - limited to 2 slides / 5 minutes
- Science thresholds / targets
resolution required, what would be gained/lost with \ell_max = 3000, 5000, 10,000 . . .,
what \ell_min is needed, sky area needed
- Concerns about systematics
what are your biggest concerns? what do we need to simulate?
- Foreground worries and mitigation strategies
your biggest concerns (as function of ell), what simulations are needed, frequency bands
- Next steps?


• Instrument White Paper presentations
Charge for Instrument White Papers sessions:
- Very brief primer for non-experts - limited to 2 slides / 5 minutes
- Brief overview of options and requirements of each sub-system
- Comparison of options / Pros and cons.
- Is it sufficiently developed for designing in FY19 and implementing in FY20?
- Pre-CD1 R&D required? If so, how much?
- What are the highest priority R&D or technical demonstrations to be done. When?
- Next steps?


## Tuesday, September 20: Toward Concept Design

Morning Plenaries

• Resolution Discussion (moderator: Jo Dunkley)
• Discussion of Strawman Configuration Concepts (moderator: John Ruhl)

Afternoon Parallels: Large/medium/small Telescope Discussion and Next-generation Forecast Planning

• Large/medium/small Telescope Discussion - feel free to use the wiki to take notes for your session
• Next-generation Forecast Planning

Afternoon Plenaries / Wrap-up

• Reports from parallel sessions (Plenary 2 speakers)
• Final Discussion / Next Steps / Homework / Working groups ...
Real-time HW List from during Workshop
- Instrumentation Group -- Form a Systems Engineering Group;  define goals and a schedule for near-term deliverables
- Instrumentation Group -- Prioritize R & D needs, particularly identifying near-term needs
- Simulations / Telescopes -- need to take GRASP beam simulations and simulate systematic effects -- Start with general sidelobes to set telescope specs
- Need to assemble table of science requirements, i.e, sigma(r), sigma(Neff), sigma(sum m nu),...  Include priorities (or weights)
- Data challenges
- Form serendipity group for other science? Produce another chapter or document?
- Start building map-based analysis tools for simulations and real data analysis common to entire CMB-S4 collaboration?