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
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