1 / 12

The Project Office Perspective

The Project Office Perspective. Antonin Bouchez. Outline. Project Status AO requirements Baseline Design Unresolved technical issues Meeting goals. Project Status. We’re working towards project PDR in “early” 2012. AO PDR must precede this; planning for Dec. 2011.

shanae
Télécharger la présentation

The Project Office Perspective

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. The Project Office Perspective Antonin Bouchez GMT AO Workshop, Canberra 22-24 Nov. 2010

  2. Outline • Project Status • AO requirements • Baseline Design • Unresolved technical issues • Meeting goals GMT AO Workshop, Canberra 22-24 Nov. 2010

  3. Project Status • We’re working towards project PDR in “early” 2012. • AO PDR must precede this; planning for Dec. 2011. • New project manager Keith Raybould starts Dec. 6. • Major replanning effort has begun • Restructured WBS • Bottoms-up cost estimate (to complete by January 2011) • Previous cost estimate for AO: $58.6 M (2004 $) • Schedule through construction (complete ~March 2011?) • Current direction from management: Design to the the science requirements, without cost constraint. GMT AO Workshop, Canberra 22-24 Nov. 2010

  4. Thoughts on AO project management • AO system will likely cost ~$75M. Most of this work will have to be done by industry. • However, AO/instrument groups at partner institutions provide experience, design expertise, and an ideal environment for technology development and testing. • We’re very aware that project organization, systems engineering, and communications must be improved. • Launching online communications tools (Basecamp) • Hiring additional systems engineers • Instituting a change control board GMT AO Workshop, Canberra 22-24 Nov. 2010

  5. Top-level performance requirements • Additional Requirements: • Shall not preclude future implementation of MCAO and MOAO observing modes. • AO system shall have <20% emissivity (<10% goal). GMT AO Workshop, Canberra 22-24 Nov. 2010 5

  6. Instrument-specific Requirements • 4 instruments currently being studied, with a wide range of AO requirements not captured in top-level requirements: GMTIFS NGS/LTAO with strict tip/tilt requirements GMTNIRS NGS/LTAO with loose tip/tilt requirements TIGER High Strehl – potentially NGS only NIRMOS GLAO only • Challenge for AO team is to design a single system which will suit any 1-2 of these which are selected for 1st light construction. • Our strategy: • Design common components (ASM, lasers, RTC) which meet the most stringent requirement. • Design a suite of sensors which can meet requirements of each mode, and assume that the selected instruments will only implement certain sensors. • Do this with minimum duplication of effort: eg. only 1 IR-WFS design. GMT AO Workshop, Canberra 22-24 Nov. 2010

  7. top view AO System Baseline Design On-axis LGS Projector 7x672 actuator adaptive secondary mirror • Wavefront sensors: • Visible WFS modules attach to front of instruments: 1 HO-WFS, 3 LO-WFS, 6 LGS-WFS • 1 IR-WFS internal to instrument which require high sky coverage • 1 Optical Phasing Sensor common to all instruments Free space beam relay Lasers:6x30W CW + spare Separate GLAO dichroic & LGS-WFS assembly GMT AO Workshop, Canberra 22-24 Nov. 2010

  8. Phasing System Baseline Design • GLAO: No phasing necessary • NGSAO: Use a pyramid NGS sensor to sense both telescope & atmospheric piston. • LTAO: Slow (~1 min) Optical Piston Sensor with large patrol area + fast (100 Hz) relative metrology of adjacent segments. Average over atmospheric piston and accept 120 nm RMS WFE. Various alternative LTAO piston sensing approaches have been discussed, but none demonstrated to be sufficiently general. GMT AO Workshop, Canberra 22-24 Nov. 2010

  9. AO System Design Effort • 5 components to the preliminary design effort: UA NGSAO and GLAO subsystems ANU LTAO subsystems SAO Optical phasing sensor ADS/MG Adaptive secondary mirror Proj. Office Systems engineering, edge sensors • Potential additional design contracts to industry: Real-time computer, … GMT AO Workshop, Canberra 22-24 Nov. 2010

  10. Unresolved Technical Questions • Sky coverage & NGS sensor architecture… • Can we develop an IR WFS design which suits all instrument’s needs? • Are any of the alternative LTAO optical piston sensor approaches worth pursuing? • Need to define and simulate interaction between AO and piston control loops. • Are active optics WFS necessary/useful in NGSAO or LTAO control loop? • Could active optics WFS be sufficient for all NGS sensing in GLAO mode? GMT AO Workshop, Canberra 22-24 Nov. 2010

  11. [My] Meeting Goals • We agree on a baseline design, including which aspects are yet to be defined. • We agree on various groups’ responsibilities for the preliminary design phase, and the critical interfaces between these subsystems. • We set up a schedule for communication between groups on design & interfaces. • We compile a list of the technical questions which need to be resolved, and assign these to individuals. • We compile a list of management and systems engineering issues which the project office must address. GMT AO Workshop, Canberra 22-24 Nov. 2010

  12. End GMT AO Workshop, Canberra 22-24 Nov. 2010

More Related