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FTT-NAS CoDR Report.doc

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MRO FTT-NAS

Conceptual Design Report

The Cambridge Delay Line Team

rev 0.1 5 July 2010

Cavendish Laboratory JJ Thomson Avenue Cambridge CB3 0HE UK


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Change Record
Revision Date Author(s) Changes

Objective
A single sentence saying what purpose this document serves....

Scope
Here we outline the scope of the document: what is/isn't covered. Perhaps refer to other documents containing related material.

Reference Documents
RD1 Top-level requirements INT-406-TSP-XXXX RD2

Applicable Documents
These are other review documents for review which are directly applicable, e.g. AD01 Derived Requirements INT-406-VEN-XXXX

Acronyms and Abbreviations
BCA BCF BRS DL DLA FTT FLC ICD Beam Combining Area Beam Combining Facility Beam Relay System Delay Line Delay Line Area Fast Tip-tilt First Light Camera Interface Control Document Interferometer MRAO Mullard Radio Astronomy Observatory NAS OPD SCS TBC TBD WFS Narrow-field Acquisition System Optical Path Delay Supervisory Control System To be confirmed To be determined Wide ... NMT New Mexico Tech

MROI Magdalena Ridge Observatory


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Table of Contents
1 2 Introduction .................................................................................................................................. 1.1 Top level requirements......................................................................................................... 1.1.1 Subsubsection .............................................................................................................. Derived Requirements.................................................................................................................. 2.1 Assumptions ......................................................................................................................... 2.2 Derived requirements overview ........................................................................................... 2.2.1 Pixel scale .................................................................................................................... 2.2.2 FTT mode sub-frame size ............................................................................................ 2.2.3 Image quality................................................................................................................ 2.2.4 Stability of tip-tilt zero point........................................................................................ 2.2.5 Thermal management................................................................................................... 2.2.6 Closed loop bandwidth................................................................................................. 2.2.7 Limiting Sensitivity ..................................................................................................... 2.2.8 Dynamic range ............................................................................................................. Optical Layouts ............................................................................................................................ 3.1 Candidate layouts ................................................................................................................. 3.1.1 One ............................................................................................................................... Two .............................................................................................................................. 3.1.2 3.1.3 Three ............................................................................................................................ Four .............................................................................................................................. 3.1.4 3.1.5 Comparison of candidate layouts ................................................................................. Preferred layouts .................................................................................................................. 3.2 3.2.1 Error budgets and sensitivities ..................................................................................... Feasibility ..................................................................................................................... 3.2.2 3.2.3 Comparison of costs ..................................................................................................... Camera Selection ......................................................................................................................... 4.1 Candidate cameras ............................................................................................................... Camera evaluation................................................................................................................ 4.2 Conceptual Opto-Mechanical Design .......................................................................................... 5.1 Layout .................................................................................................................................. 5.2 Mechanical analyses ............................................................................................................ 5.3 Base-plate design ................................................................................................................. Optical mount design ........................................................................................................... 5.4 5.5 Camera mount ...................................................................................................................... Conceptual Thermal Design......................................................................................................... 6.1 Thermal control .................................................................................................................... 6.1.1 Camera enclosure analysis ........................................................................................... Control enclosure analysis ........................................................................................... 6.1.2 6.1.3 Conceptual design of thermal control .......................................................................... 6.2 Camera enclosure design ..................................................................................................... Control enclosure design.............................................................................................. 6.2.1 Conceptual Electronics Design .................................................................................................... Conceptual Software Design........................................................................................................ 8.1 Software requirements ......................................................................................................... 8.2 Software design .................................................................................................................... Interfaces ...................................................................................................................................... 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 6 6 6 6 6 6 6 6 6 6 6

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1

Introduction

This is the introduction. This is a new paragraph.

1.1

Top level requirements

Refer to top level requirements and include table here?

1.1.1 Subsubsection
This is a subsubsection of the introduction.

2

Derived Requirements

Explain assumptions Address in subsections. Refer to document. Brief explanation of how these were obtained.

2.1 2.2

Assumptions Derived requirements overview

2.2.1 Pixel scale 2.2.2 FTT mode sub-frame size 2.2.3 Image quality 2.2.4 Stability of tip-tilt zero point 2.2.5 Thermal management 2.2.6 Closed loop bandwidth 2.2.7 Limiting Sensitivity 2.2.8 Dynamic range

3

Optical Layouts

Present layouts considered with a comparison table and reasons for choosing preferred candidate(s) for further analysis.

3.1

Candidate layouts

Discussion of issues affecting the choice of layouts followed by subsections containing a layout, description and comparative qualities.


FTT-NAS CoDR Report.doc 3.1.1 One 3.1.2 Two 3.1.3 Three 3.1.4 Four 3.1.5 Comparison of candidate layouts
Comparison of layouts. Reasons for choosing preferred layout(s)

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3.2

Preferred layouts

3.2.1 Error budgets and sensitivities 3.2.2 Feasibility 3.2.3 Comparison of costs

4
4.1 4.2

Camera Selection
Candidate cameras Camera evaluation

5
5.1 5.2 5.3 5.4 5.5

Conceptual Opto-Mechanical Design
Layout Mechanical analyses Base-plate design Optical mount design Camera mount

6

Conceptual Thermal Design


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6.1

Thermal control

6.1.1 Camera enclosure analysis 6.1.2 Control enclosure analysis 6.1.3 Conceptual design of thermal control

6.2

Camera enclosure design

6.2.1 Control enclosure design

7 8
8.1 8.2

Conceptual Electronics Design Conceptual Software Design
Software requirements Software design

9

Interfaces

10 CoDR Summary