CMB-S4

CMB-S4 Next Generation CMB Experiment

working groups

Technical Working Groups

Detectors

  • Description: Designing, developing, and fabricating wafers of high-sensitivity detectors to measure the temperature and polarization of mm-wave photons at each of the CMB-S4 observing frequencies.
  • Coordinator: Brenna Flaugher (interim)
  • Mailing List: [email protected]

Readout

  • Description: Developing, building and testing the superconducting circuits, wiring, and room-temperature electronics that will bias the detectors to sit at their transition and will measure, amplify, and digitize their signals to send to data acquisition, and delivering this readout subsystem to module assembly & testing for integration.
  • Coordinator: Zeesh Ahmed
  • Mailing List: [email protected]

Module Assembly & Testing

  • Description: Assembling the detector wafers, cryogenic readout, and microwave coupling into integrated detector modules, verifying and characterizing their performance, and delivering them for deployment in the large and small aperture telescopes.
  • Coordinator: Brad Benson
  • Mailing List: [email protected]

Large Aperture Telescopes

  • Description: Developing three Large Aperture Telescopes and the associated receivers to enable the legacy survey from Chile and the delensing survey from the South Pole, including the telescope specifications and engineering, receiver optics, cryogenics, mechanical systems, and supports for the detector modules.
  • Coordinator: Mike Niemack
  • Mailing List: [email protected]

Small Aperture Telescopes

  • Description: Providing design guidance for the Small Aperture Telescopes, optimized to produce CMB-S4’s extremely deep B-mode measurements at degree-scales, including the cryogenic telescope optics, the receiver cryostats and cooling systems from ambient temperature to the 100 mK focal planes, the magnetic and RF shielding, the 3-axis telescope mounts, and the external optical shielding.
  • Coordinators: John Kovac & Akito Kusaka
  • Mailing List: [email protected]

Data Acquisition & Control

  • Description: Building the software required to control, monitor, and aggregate data from all telescopes at each site, including detector readout, telescope platforms, cryogenics, calibrators, and associated auxiliary hardware.
  • Coordinator: Laura Newburgh
  • Mailing List: [email protected]

Data Management

  • Description: Developing the data management subsystem, from the raw data coming off the telescopes to well-characterized single-frequency sky maps and transient alerts, and deploying it to support the development and validation of the experiment design.
  • Coordinator: Julian Borrill (interim)
  • Mailing List: [email protected]

Chile Site Infrastructure & Integration

  • Description: Developing infrastructure at the Chile site, including new buildings and logistics in support of the telescopes, and planning the on-site integration and commissioning program of the receivers.
  • Coordinator: Kam Arnold
  • Mailing List: [email protected]

South Pole Site Infrastructure & Integration

  • Description: Developing infrastructure at the South Pole site, including new buildings and logistics in support of the telescopes, and planning the on-site integration and commissioning program of the receivers.
  • Coordinator: Amy Bender
  • Mailing List: [email protected]

Analysis Working Groups

Low-ell BB

  • Description: Preparing forecasts and analysis pipelines to search for primordial gravitational waves using deep polarization maps from Small Aperture Telescopes delensed with the maps from the Large Aperture Telescopes.
  • Coordinators: Colin Bischoff & Kimmy Wu
  • Mailing List: [email protected]

Maps to Power Spectra

  • Description: Preparing for the power spectrum analyses of the primary and secondary CMB anisotropy with CMB-S4, and the cosmological interpretation of the power spectrum  measurements.
  • Coordinators: Marilena Loverde & Christian Reichardt
  • Mailing List: [email protected]

Maps to Other Statistics

  • Description: Developing science applications, forecasts, and analysis techniques for map-based statistics beyond the power spectrum, including lensing, Sunyaev-Zel’dovich effects, and cross-correlations with external data sets.
  • Coordinators: Marcelo Alvarez & Blake Sherwin
  • Mailing List: [email protected]

Clusters

  • Description: Developing the science case and data pipeline for all of the cluster science enabled by CMB-S4.
  • Coordinators: Jim Bartlett & Srini Raghunathan
  • Mailing List: [email protected]

Sources

  • Description: Advancing the science case, developing the data pipeline, and preparing for the scientific analyses for discrete astrophysical sources in the maps, including spatial and temporal transient.
  • Coordinators: Anna Ho & Joaquin Vieira
  • Mailing List: [email protected]