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UCSD 2019: CMB-S4 Collaboration Workshop at U.C. San Diego October 17-19, 2019
July 28, 2019
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CMB-S4 Achieves DOE Critical Design 0 on July 26, 2019
July 28, 2019
We are delighted to report that DOE approved CD-0 for CMB-S4. This is a very significant milestone for us, made possible by the enormous effort of the CMB community ever since CMB-S4 was first conceived back in 2013.
We look forward to advancing the science case and moving CMB-S4 forward on the path to DOE CD-1 and NSF PDR, anticipated in 2021.
Congratulations to CMB-S4 collaboration!
John, Julian and Jim
CMB-S4 APC White Paper Submitted to Decadal Survey on July 10, 2019
July 28, 2019
The 10 page CMB-S4 project white paper was submitted to the Decadal Survey on July 10, 2019 and posted on the archive. See https://arxiv.org/abs/1908.01062Learn more >>
CMB-S4 Science Case, Reference Design and Project Plan posted
July 28, 2019
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Results of Inaugural CMB-S4 Collaboration Elections
April 24, 2018
Over the course of three weeks, starting on April 3, 2018, the inaugural round of elections for CMB-S4 executive positions and governing board was held. Thanks to everyone who participated, including all candidates and voters, and congratulations to the inaugural Co-Spokespeople, Science Council chairs, Membership and Publications/Speakers Committee chairs, and Governing Board members.
The inaugural Co-Spokespeople for the CMB-S4 collaboration are Julian Borrill and John Carlstrom.
The inaugural co-chairs of the Science Council are Gil Holder and Lloyd Knox.
The inaugural chair of the Membership Committee is John Ruhl, and the inaugural chair of the Publications and Speakers Committee is Kevin Huffenberger.
The members of the inaugural Governing Board are (in alphabetical order): Zeesh Ahmed, Nicholas Battaglia, Amy Bender, Bradford Benson, Lindsey Bleem, François Bouchet, Abby Crites (postdoctoral representative), Tom Crawford, Mark Devlin, Brenna Flaugher, Nils Halverson, William Jones, John Kovac, Akito Kusaka, Charles Lawrence, Adrian Lee, Michael Niemack, Suzanne Staggs, and Aritoki Suzuki.
Congratulations again to all!
CMB-S4 Bylaws Ratified
March 19, 2018
On March 19, 2018, it was officially announced that the CMB-S4 collaboration bylaws have been ratified. CMB-S4 is now an official collaboration with 157 Collaboration Members.
Argonne-2018: Cosmology with CMB-S4
March 7, 2018
The series of open workshops to define the CMB-S4 project and collaboration continued this March with the successful Cosmology with CMB-S4 workshop at Argonne National Laboratory. Among the important achievements of this workshop was a finalized set of bylaws for the collaboration, to be ratified immediately after the workshop. This milestone will mark the beginning of the official CMB-S4 collaboration.
The other major goal of the workshop was to begin planning for a report to be submitted in preparation for the National Academies' Astronomy Decadal Survey in Astronomy & Astrophysics.Learn more >>
CMB-S4 Concept Definition Task Force issues final report
October 23, 2017
This report presents a concept for implementing a ground-based Cosmic Microwave Background Stage-4 experiment (CMB-S4) designed to tackle questions about fundamental physics from the earliest moments in the Universe through to the epoch of dark energy domination. CMB-S4 will search for in ation at one end of the energy scale, and for sub-eV particles at the other, including neutrinos and as-yet-undiscovered light relics. CMB-S4 data will trace out the behavior of gravity across cosmological distances and anchor our understanding of how structures form under the gravitational collapse of dark matter moderated by the in uence of baryons. These aims require CMB measurements with sensitivity, precision, and accuracy far beyond those obtained to date, roughly two orders of magnitude more sensitive than the summation of all measurements acquired so far, and an order of magnitude more sensitive than Stage-3 experiments. To address this challenge, the CMB community has come together to advocate a single comprehensive CMB-S4 experiment, which has been endorsed by the 2014 report of the Particle Physics Project Prioritization Panel (P5) Building for Discovery and the 2015 NAS/NRC report A Strategic Vision for NSF Investments in Antarctic and Southern Ocean Research.Learn more >>
September 1, 2017
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.Learn more >>
Harvard-2017: Collaboration Workshop
August 28, 2017
The CMB-S4 Collaboration Workshop at Harvard (August 2017) will continue the series of open workshops for the CMB observational and theoretical community to define the 'Stage-4' ground-based cosmic microwave background (CMB) experiment.
From the CMB-S4 homepage: ''[this experiment], consisting of dedicated telescopes equipped with highly sensitive superconducting cameras operating at the South Pole, the high Chilean Atacama plateau, and possibly northern hemisphere sites, will provide a dramatic leap forward in our understanding of the fundamental nature of space and time and the evolution of the Universe. CMB-S4 will be designed to cross critical thresholds in testing inflation, determining the number and masses of the neutrinos, constraining possible new light relic particles, providing precise constraints on the nature of dark energy, and testing general relativity on large scales.''
Topics of the workshop
CMB-S4 Technology Book, First Edition (arXiv:1706.02464)
June 19, 2017
CMB-S4 is a proposed experiment to map the polarization of the Cosmic Microwave Background (CMB) to nearly the cosmic variance limit for the angular scales that are accessible from the ground. The science goals and capabilities of CMB-S4 in illuminating cosmic inflation, measuring the sum of neutrino masses, searching for relativistic relics in the early universe, characterizing dark energy and dark matter, and mapping the matter distribution in the universe have been described in the CMB-S4 Science Book. This Technology Book is a companion volume to the Science Book. The ambitious science goals of the proposed ''Stage-IV'' CMB-S4 will require a step forward in experimental capability from the current Stage-III experiments. To guide this process, the community summarized the current state of the technology and identify R&D efforts necessary to advance it for possible use in CMB-S4. The book focused on the technical challenges in four broad areas: Telescope Design; Receiver Optics; Focal-Plane Optical Coupling; and Focal-Plane Sensor and Readout.Learn more >>
SLAC-2017 Collaboration Workshop
March 1, 2017
Themes of this workshop include a particular focus on
Joint DOE and NSF Concept Definition Task Force has been formed
January 6, 2017
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CMB-S4 Science Book, First Edition (arXiv:1610.02743)
October 10, 2016
This book lays out the scientific goals to be addressed by the next-generation ground-based cosmic microwave background experiment, CMB-S4, envisioned to consist of dedicated telescopes at the South Pole, the high Chilean Atacama plateau and possibly a northern hemisphere site, all equipped with new superconducting cameras. CMB-S4 will dramatically advance cosmological studies by crossing critical thresholds in the search for the B-mode polarization signature of primordial gravitational waves, in the determination of the number and masses of the neutrinos, in the search for evidence of new light relics, in constraining the nature of dark energy, and in testing general relativity on large scales.Learn more >>
UChicago 2016 Collaboration Workshop
September 21, 2016
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LBNL-2016 Collaboration Workshop
March 7, 2016
This collaboration workshop will be hosted by Lawrence Berkeley National Laboratory.Learn more >>
UMICH-2015 Collaboration Workshop
September 21, 2015
This workshop aims to further develop the science goals, including the requisite measurements to achieve them, for the next generation ground-based Cosmic Microwave Background program, CMB-S4. The output of the workshop will be a working draft of the CMB-S4 "Science Book." This is the first in a series of potentially biannual workshops focused on developing the CMB-S4 project.
Opening sessions will begin with invited plenary talks. These will be followed by a series of parallel breakout sessions, followed by plenary reports and discussion.Learn more >>