UCSD-2019: Analysis/Pipeline Working Group: Low-ell BB

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  1. Identify key decisions that must be made (and justified) prior to CD-1,
  2. Make progress on (or actually make) those decisions,
  3. Lay out a timeline and process for making each decision, consistent with the post-decision work and internal reviews that will be needed to complete preparations for CD-1,
  4. Ensure that those timelines and processes are understood and supported by the collaboration, and that we (together) believe we can follow them.

Key Issues

  • How do we optimize detector allocation across frequency in the face of uncertainty about foreground properties, for both the SATs and the delensing LAT?
  • What are the advantages of split bands? How does performance compare to non-split bands?
  • Do we need a 20 GHz channel on delensing LAT (for SAT science)
  • How well will de-lensing work in practice?
  • What are the necessary analysis tools to answer these questions?

What is CD-1?

Blatantly copied from Analysis/Pipeline Working Group: Maps to C_ell:

Background/clarifying questions:

  • What does “by CD-1” mean, and what are the implications for when tools need to be in place and working?
    • According to APC white paper (https://arxiv.org/abs/1908.01062), CD-1 is in Q3 of FY2021 (so June 2021?).
      • But according to project office, "Plan [must be] finalized by start of 2020 for delivering...CD-1"
    • Working backward from there, any tool that could reasonably influence a CD-1 decision needs to be in place and working by ... ?
    • Give an example timeline for an example decision?


  1. Introduction by everyone in the room: who? where? what aspects of low-ell BB interest you? 5 minutes
  2. Recap of the plan for this session/CD-1 goals [Wu], 3 minutes
  3. Review of Fisher based S4 forecasting thus far leading to DSR appendix A [Ben], 15 minutes
  4. Review of Map based S4 forecasting thus far and ideas for next steps Clem, 10 minutes
  5. Review of forecasting and simulations for Simons Observatory inflation science [Alonso / Errard / Sherwin], 30 minutes
  6. Plans for working group [all], ~60 minutes
    1. Forecasting
      • Quantitative comparison of SO and CMB-S4 DSR forecasts
      • Feedback loop between forecasting and data challenges
    2. Data Challenge simulations
      • More / better foreground models
      • Instrumental systematics
      • Other map non-idealities, i.e. filtering / mode loss
      • Coordination with technical groups on instrument configuration, etc
      • What else needs to be demonstrated for CD1?
    3. Analysis of Data Challenges
      • Who plans to participate? How do we get more participation?
      • Delensing

Remote attendance

Zoom link