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This is the start page for the CMB-S4 wiki

CMB-S4 Collaboration

Phone numbers / web service for conference calls (please check the CMB-S4 Telecons calendar for availability):

  • 1-866-578-4799
  • 1-480-999-2448

  • 1-866-554-6782
  • 1-301-264-6489

Collaboration Voting

2018 Election Pages

List of S4 Registered Voters: File:CMB-S4 Collaboration March2018.pdf

CMB-S4 Interim Collaboration Coordination Committee (ICCC)

From now until approximately March, 2018, the Interim Collaboration Coordination Committee (ICCC) for CMB-S4 will coordinate the activities of the Working Groups formed to work on collaboration bylaws and technical and science efforts. The ICCC will work to facilitate cross-group communications, help coordinate schedules and milestones for the Working Groups, and prepare preliminary documents for ratification by the full S4 collaboration. The goal date for ratification is March, 2018. The ICCC will meet periodically with representatives from the DOE and NSF to keep them updated on progress and to receive their input and advice. The ICCC has 15 members (see link to list below); the co-chairs are John Carlstrom and Suzanne Staggs. If you have input or questions about the ICCC work, you may email the entire ICCC using, or individual members (included in the list linked below). The ICCC will disband once the governance bylaws are ratified and its successor has been established.

ICCC Team Members List (with email addresses)

ICCC wiki page (members only)

Working Groups Aimed at Producing Draft Collaboration Governance Bylaws for Consideration by the CMB-S4 Collaboration

Here are the charges to the working groups: File:ICCC-charges-to-WG-20171105.txt

Bylaws Interface Issues Document, posted Feb 2018.

Here is the repository for collaboratively editing governance documents:

Governance Structure and Bylaws Working Group

Governance Structure and Bylaws Working Group

Membership Policy Working Group

Membership Policy Working Group

Publications Policy and Interim Speakers' Bureau Working Group

Publication and Speakers Working Group

Useful files/documents for input to drafting CMB-S4 collaboration policies:

File:CMB-S4 Bylaws Example-v2.pdf -- Example of CMB-S4 Bylaws drafted by Karen Byrum prior to the Harvard workshop to give us an idea of what CMB-S4 Collaboration Bylaws may look like. The working groups should feel to use as much or as little of this draft as they wish. None of the statements or procedures in it should be considered as decided or even recommended. However, the text will hopefully provide a useful template.

The following files are from the collaboration sessions at the Harvard workshop -- linked again here for convenience.

File:CMB-S4-Collaboration-Elements v4.pdf -- Brenna Flaugher's slides from Harvard with org charts from several different big projects

File:Byrum-Governance Collaboration ByLaws-v2.pdf -- Karen Byrum’s slides from Harvard with examples of governance bylaws issues.

File:Membership Policies.pdf -- Steve Kuhlmann's Harvard workshop presentation on collaboration Membership policy.

File:Pubs-intro.pdf -- Nathan Whitehorn's slides on introduction to Publication Policy.

File:Governance-parallel-report-after-plenary.pdf -- collaboration plenary wrap up talk, including org chart and feedback from plenary.

Older (ICCC Voting)

As agreed upon at the Aug 2017 Workshop, the Interim Collaboration Coordination Committee (ICCC) for the S4 will coordinate the activities of the Working Groups formed to work on collaboration bylaws and technical and science efforts. The ICCC will have 15 members. S4 registered voters will choose 7 members, and the remaining members will be appointed by the S4 Workshops Science Organizing Committee to ensure diversity on the ICCC, including career experience, institutional sizes, projects, locations of institutions, etc. The ICCC will elect its own chair, and other positions as needed (like deputy chair and secretary). The ICCC will disband once the governance bylaws are ratified.

Table of S4 ICCC Self Nominations: File:S4-ICCC-Self-Nominations-final-20170901-for-display.pdf

CMB-S4 Concept Definition Task Force

In December 2016 the NSF-NASA-DOE Astronomy and Astrophysics Advisory Committee (AAAC) established an Cosmic Microwave Background Stage 4 Concept Definition Task Force (CMB-S4 CDT) as a subcommittee to develop a concept for implementing a ground-based CMB-S4 experiment. (Link to NSF CDT site.)

CDT Team Members List

Charge Letter to the CDT from the AAAC

CDT Report (final, as accepted by the AAAC, 24Oct17)

CDT wiki page (members only)

Mailing Lists

To sign up for the main CMB-S4 email list, go to this page: CMB-S4 main mailing list sign-up page.

We also have subject specific sub-lists for: Dark Energy, Forecasting, Inflation, Instrument, CMB Lensing, Large-scale Structure Observables, Neutrinos, Sky Modeling, and Telescopes.

GitHub Repositories

The CMB-S4 GitHub Repository

CMB-S4 Science Book

The purpose of Science Book is to set the scientific goals for CMB-S4 and specify the measurements needed to achieve them, which will then be translated into the instrument requirements. This will set the stage for defining the instrument.

The history of posted Science Book drafts can be found here: CMB-S4 Science Book Comments.

The Concept Definition Task Force has been tasked with writing down science requirements, with three suggested levels (sky's the limit, minimum worth doing, something in between). John C. has, in turn, asked the Science Book chapter leads to create a summary table of requirements from the book. A workbook / dialog for putting that table together is here: Putting Together the CMB-S4 Science Book Requirements Table.

CMB-S4 Instrument Technical Papers

CMB-S4 Instrument Technical Paper

Goal of CMB-S4 instrument technical papers are to summarize the current state of the technology and identify R\&D efforts necessary to advance it for possible use in CMB-S4. CMB-S4 will require a scale-up in number of elements, frequency coverage, and bandwidth relative to current instruments. Because it is searching for lower magnitude signals, it will also require stronger control of systematic uncertainties.


CMB-S4 Presentations

Post your CMB-S4 talks on the page linked here.

Simulation Products and Forecasting:

Logbooks and Notes