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Session notes for project planning & preparations for decadal

Adrian Lee: Overview of CDT straw man configuration

Disposition of telescopes to sites was not in the CDT report.

Q. Any thoughts on a more northern site? A. Not a huge improvement over Chile + Pole, so not part of the CDT straw man.

CDT cost $412M, but some options for lower cost by re-using existing telescopes and infrastructure.

Need to develop the straw man into a reference design, including telescope distribution among sites, technical selections.

Kathy Turner comments

Kathy called in for a few minutes.

We are really happy with the results of the CDT. Excellent report. Happy with the different costing studies. This is notional, so changes expected. Charles presented CDT results to AAAC and Particle Physics Science Advisory Committee. Meeting last week with DOE and NSF. Pleased to hear about progress with ICCC, collaboration, the reference design, and plans for the future. Agencies will come back to collaboration with advice.

Jim Yeck: pPDG

Key goals: 1 project; 2 sites, Chile + Pole; joint DOE/NSF oversight.

Boundary conditions. DOE can begin investments based on P5. NSF will await 2020 Decadal Survey. Historically DOE does not build big telescopes.

Implementation. Scope sequencing. Concurrent development of the 2 sites. Pursue the 3 CDT science goals in parallel.

Discussing scope distribution between the 2 sites, agency coordination, phased transition to operations.

Timeline. CD0 late 2018. CD1/3a 2021 (CD1 is a critical step for DOE), CD3b 2023. NSF CDR review 2021, PDR 2022, FDR 2023, MREFC funding 2024. Agency response to timeline on 2/28/18 was generally positive.

Key message. Important to move on technical decisions ASAP. All previous experience points to this. Develop a technically limited schedule, then adjust to suit funding reality later.

Decadal CDR will need to be supported by development of a reference schedule and costing.

Need to define the role of legacy investments, international collaboration, and private investments (e.g., Simons Observatory).

Mark Devlin: Lessons from Simons Observatory

6yr 73M program. 6m cD telescope. 4x42cm refractors. First light 2021. Adjacent to ACT & Simons Array.

Difficult to do the right thing at the right time.