THE LGSF LASER SYSTEM - Thirty Meter Telescope

TMT.AOS.DRD.09.003.DRF05 Page 2 of 30REQUIREMENTS DOCUMENT FOR THE LGSF LASER SYSTEM August 25, 2009TABLE OF CONTENTS1. INTRODUCTION 51.1 Introduction.............................................................................................................................................51.2 Purpose...................................................................................................................................................51.3 Scope ......................................................................................................................................................51.4 Applicable Documents .........................................................................................................................51.5 Change Record .....................................................................................................................................61.6 Abbreviations .........................................................................................................................................62. OVERALL DESCRIPTION 92.1 Perspective.............................................................................................................................................92.2 System Functions................................................................................................................................102.3 User and Operator Characteristics...................................................................................................102.4 External Interfaces ..............................................................................................................................112.5 Constraints ...........................................................................................................................................112.6 Assumptions and Dependencies......................................................................................................113. SPECIFIC REQUIREMENTS 133.1 General Requirements.......................................................................................................................133.1.1 Standards Requirements...........................................................................................................133.1.2 Sub-system Decomposition Requirements ............................................................................133.2 Environmental Constraints ................................................................................................................133.3 Functional and Performance Requirements...................................................................................143.3.1 Laser Power Requirements.......................................................................................................143.3.2 Laser Beam Performance Requirements ...............................................................................153.3.3 Laser Operation Requirements ................................................................................................163.3.4 Laser System Location and Mass Requirements..................................................................173.3.5 Laser System Power Consumption, Dissipation and Cooling Requirements...................173.3.6 Laser System Emission Requirements ...................................................................................183.3.7 Laser System Vibration Requirements....................................................................................183.3.8 Laser System Software Requirements....................................................................................183.3.8.1 Laser Controller Requirements.........................................................................................193.3.8.2 Laser Sequencer Requirements.......................................................................................203.4 System Attributes Requirements......................................................................................................223.4.1 Reliability Requirements ............................................................................................................223.4.2 Safety and Security Requirements ..........................................................................................233.4.3 Maintainability Requirements....................................................................................................233.5 Access and Handling Requirements ...............................................................................................243.6 Interface Requirements......................................................................................................................253.6.1 Telescope Structure (STR) Interface.......................................................................................253.6.2 AO Executive Software (AOESW) Interface ..........................................................................263.6.3 Data Management System (DMS) Interface ..........................................................................273.6.4 LGSF Interface ............................................................................................................................274. APPENDIX: LASER SYSTEM ENVELOPE DRAWING 29