<Keck NGAO Team Meeting #5>

9:50a - 4:00p PST

Wednesday, March 7, 2007

Tele/Videoconference

Dial-in Number: 877-280-4645 Passcode: 540030 Videoconference IP: 128.171.99.70 (Hualalai CR)

(Tentative) Goals:

• Review Project Status
• Review recent Trade Studies

(Tentative) Agenda:

• 9:50 am Telecommunications check
• 10:00 am Management Report (Wizinowich) Management Report
  • Review study overall progress, progress against milestones, and summary financial situation
• 10:30 am Science Team Report (Max) * Max_BHs_in_Nearby_Gals.ppt
• 10:45 am Systems Engineering Report (Dekany) Systems Engineering Report (.pdf)
  • Review the status of all systems engineering deliverables.
• 11:15 am Throughput and Emissivity Performance Budgets (Bouchez) emissivity_budget_mtg5.ppt
  • From the WBS Dictionary: Development of optical transmission budgets for each of the science path(s), HOWFS, LOWFS(s), and slow WFS. Development of thermal background budget for the IR science and wavefront sensor instruments
• 11:45 am Trade Study Report: GLAO for non-NGAO instruments (Flicker) GLAO for non-NGAO instruments (.ppt)
  • From the WBS Dictionary: Consider the relative performance, cost, risk, and schedule of GLAO compensation using an ASM as a wide-field optical relay for non-NGAO instruments. Complete when expected performance benefit for each instrument documented.
• 12:15 pm Trade Study Report: MOAO vs MCAO Update (Gavel) Report (.pdf)
  • From the WBS Dictionary: This trade study is intended to build our expertise with MOAO & MCAO. The existing MOAO & MCAO design studies should be reviewed. The product should be a summary of the issues related to these two approaches, including an understanding of the potential risks, technical challenges, limitations, advantages and room for improvement with each of these approaches.
  • This trade study was also presented at Meeting 3.

• 12:45 pm Break

• 1:15 pm Trade Study Report: Optical relay (Bauman) Report (.ppt)
  • From the WBS Dictionary: Consider the relative performance, cost & risk of OAP, general 2-mirror & Offner relays. Consider image quality vs. FoV? , pupil image quality & the flowdown of requirements onto the (variable distance) LGS wavefront sensor(s). Evaluate science path and wavefront sensor paths to 150? radius, while optimizing the design over a 90? radius (after confirming that these are the correct radii to consider). Complete when an NGAO baseline optical design is selected.
• 1:45 pm Trade Study Report: NGAO vs. Keck AO upgrades (Wizinowich) Keck AO Upgrade Report (.ppt) KAON461 KAON462
  • From the WBS Dictionary: Consider the feasibility of upgrading one of the existing Keck AO systems incrementally to meet NGAO science requirements. Consider opto-mechanical constraints & upgradeability of embedded & supervisory control systems. Consider impact on science operations during NGAO commissioning. Complete when option assessment documented
• 2:15 pm Trade Study Report: Interferometry Support Options (Neyman) NGAOIF (.ppt)
  • From the WBS Dictionary: Consider the relative performance, cost, risk & schedule of feeding KI with NGAO or a repackaged version of the current AO system. Decoupling of NGAO from interferometer support may simplify & improve performance of NGAO. The feasibility of maintaining a version of the two current AO systems for KI use should be evaluated. Complete when NGAO baseline architecture selected.
• 2:45 pm Trade Study Report: Rayleigh Rejection (Velur) Rayleigh Rejection TS (.pdf)
  • From the WBS Dictionary: Evaluate the impact of unwanted Rayleigh backscatter to NGAO system performance. Consider the relative performance, cost, risk & schedule of various strategies for mitigation of LGS Rayleigh backscatter. Techniques include background subtraction, modulation & optimizing projection location. This issue is closely coupled to laser pulse format, with pulsed lasers generally providing more options for Rayleigh mitigation than CW lasers. Complete when NGAO baseline architecture selected.
  • This trade study was also presented at Meeting 3.

• 3:15 pm Upcoming tasks and milestones (Wizinowich) .ppt
• 3:30 pm Discussion: Issues pertaining to ongoing and upcoming work (All)

• 4:00 pm Adjourn