Conceptual Design Review

1. Conceptual Design Review Design Requirements The Systems Perspective Rob Hubbard Systems Engineering

2. The Flow-Down Process ATST Science Requirements Design Requirements

3. The Flow-Down Process ATST Science Requirements Functional and Performance Requirements Strawman Concepts Design Requirements

4. Getting to a Concept – Input Obvious Constraints Work Shops Experience with Similar Telescopes Funded Studies Strawman Concepts Trade Studies Engineering Analysis Baseline Telescope Concept

5. Getting to a Concept – Ideas

6. Testing the Concept Performance Evaluation No Error Budgets Design and Development of Systems and Subsystems OK? (CoDR) Science Requirements Strawman Concept Sub-System Specs, Design Requirements Cost Evaluation Yes PDR Phase • Conceptual Design Review: • What passes this test? • What work remains?

7. Some Hard Constraints from the SRD • Resolution, photon flux and sensitivity require a four-meter class telescope. • Resolution requirement also leads to a high-order adaptive optics system. • Wavelength coverage from 0.3 to 28 m leads to an all-reflecting telescope.

8. Some Challenging Requirements • Resolution Requirement (Image Quality) • Even with a 4-meter aperture, a world-class site, high-order AO system, this remains challenging. • Stray Light Requirement (Coronal Observations) • Polarization Requirement (Polarimetry)

9. Design Requirements Documents • M1 Mirror Assembly • SPEC-0007 (Ron Price) • M2 Mirror Assembly • SPEC-0008 (Ron Price) • Enclosure • SPEC-0010 (Mark Warner) • Telescope Mount Assembly • SPEC-0011 (Mark Warner)

10. The Systems Approach The diverse and sometimes competing requirements placed on ATST forces a rigorous and aggressive systems approach during all phases of the project.

11. ATST Systems ATST Systems Orientation

12. Responsibilities of Systems Engineering • Design Requirements Flow Down • Document and Drawing Control • Interface Control • Error Budgets • Standards • End-to-End Modeling • Quality Assurance Plan • Acceptance Test Plans • Integration Plan

13. Responsibilities of Systems Engineering – CoDR Emphasis • Design Requirements Flow Down • Document and Drawing Control • Interface Control • Error Budgets • Standards • End-to-End Modeling • Quality Assurance Plan • Acceptance Test Plans • Integration Plan

14. Systems Overview • Telescope Systems and Subsystems Definition • Interface Control and the N2 Diagram • Documentation Control • Error Budgets – Top Down • Error Budgets – Bottom Up

15. Glossary and Acronym List

16. Document and Drawing Control

17. Interface Control and the N2 Diagram

18. N2 Diagram Detail

19. Top Level Systems • 1.0 Telescope Assembly • 2.0 Adaptive Optics • 3.0 Instrument Systems • 4.0 High-Level Controls and Software • 5.0 Enclosure • 6.0 Support Facility and Buildings

20. Probably specific to D&D Phase. Likely to be reabsorbed later. Telescope Assembly Subsystems • 1.1 Telescope Mount Assembly • 1.2 M1 Assembly • 1.3 M2 Assembly • 1.4 Feed Optics • 1.5 Thermal Systems • 1.6 Scattered Light Control