Attendance:

Notes by:

• Workshops (Raphael, Shaul)
• Status of Spectrometer decision (Al, Amy)
• Update from the Systematics WG (Brendan)
• Update from data challenge (Lloyd, Julian)

• Foreground workshop dates are set to be Nov 29 to Dec 1. Location is UCSD.
• Science and complementarity workshop: JC proposed to keep S4 separate from an April/May Probe and decadal panel meeting. And have S4 in week of March 5 to 9. SH says that could work if we have a day or day and a half for complementarity. JC and S4 are going ahead looking at a 2-day or 2.5 day workshop, really focused on governance. JC still prefers a two separate workshop solution. Julian points out benefits to having these two workshops right next to each other, with some overlap. Chair selected by end of 2018. Julian and Lloyd to discuss at CMB-S4 ICCC meeting next week and report back.
• Spectrometer decision steps forward: Al needs to transfer to Amy an entire set of engineering specifications and cost estimates. Then Amy can provide downscope impacts for Imager. Then we figure out how Imager science is impacted. Then we can make our decision.
• Al has given engineering specifications to Amy, but is awaiting authority from GSFC to provide cost estimates. He and Amy are in communication. Amy is asking about the orientation of the spectrometer. She has looked at the technical information that they have (mass, power, data rate, thermal env. requirements, radiation tolerance, dimensions, moving parts, deployables, …) and they have not identified any immediate showstoppers or problems. what will take some time to investigate: the thermal needs and how do we accommodate them, and cost.