THE LGSF LASER SYSTEM - Thirty Meter Telescope

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TMT.AOS.DRD.09.003.DRF05 Page 10 of 30REQUIREMENTS DOCUMENT FOR THE LGSF LASER SYSTEM August 25, 2009Figure 1: LGSF Optical Block Diagram2.2 SYSTEM FUNCTIONSThe Laser System will provide the following system functions:- Generate the laser light sources required for the NFIRAOS asterism with the properpower level, spectral and temporal characteristics, and image quality.- Be upgradeable to generate the laser light sources needed by the MOAO system.2.3 USER AND OPERATOR CHARACTERISTICSThe Laser System is under the software control of the AO Sequencer (which is a subsystemof the AO Executive Software) during daytime and nighttime operations. Theseoperations include startup, observation, and shutdown operation modes.The users of the Laser System are:- The laser technicians and laser engineers. During commissioning operations, thelaser technicians/engineers perform all the functions required to start the LaserSystem, optimize performance before the LGS observations, monitor and maintainthe Laser System performance during observations and then shutdown the LaserSystem at the end of the LGS observations. During scheduled maintenanceperiods, the laser technicians/engineers perform all the maintenance activitiesrequired by the Laser System.
TMT.AOS.DRD.09.003.DRF05 Page 11 of 30REQUIREMENTS DOCUMENT FOR THE LGSF LASER SYSTEM August 25, 2009- The telescope operators. During normal science operations, the lasertechnicians/engineers perform all the functions required to start the Laser Systemduring daytime activities and the telescope operators perform all the functionsrequired to monitor the Laser System performance, and shut down the LaserSystem at the end of observations. All of these operations will be performedthrough the TMT high-level executive software, which will interface automaticallywith the Laser System.2.4 EXTERNAL INTERFACESThe LGSF Laser System interfaces with several other observatory systems, including butnot limited to:- The other LGSF sub-systems, including:i. The Laser Safety Systemii. The Beam Transfer Optics and Laser Launch Telescope System- The Telescope Structure (STR)- The AO Executive Software (AOESW)- The Data Management System (DMS)These interfaces are described in more details in section 3.6.2.5 CONSTRAINTSThe Laser System software shall comply with the TMT Observatory software standardsand software development processes to be specified in the TMT Software ManagementPlan (SMP). This plan is not complete at the time, but it will cover the following areas:- The software management process (software life-cycle and milestones, softwaredocumentation, software risk management, configuration control management…).- The software development process (requirements, design, implementation,framework, tools and standards, delivery and maintenance…). Preliminarystandards have been defined in some cases, particularly for the real time systems.Some of these preliminary standards include the choice of:i. Software development/deployment platforms: VxWorks and RT-Linux (RedHat, Novell)ii. Implementation language: C, Embedded C++, JAVA RTS- The software verification and validation process (QA, review process, integrationand test, assembly and verification…).The Laser System shall comply with the safety regulations and processes to be defined inthe TMT Laser Safety Program Document. This document is not complete at this time, butit will cover the following areas:- Safety responsibilities,- Laser safety procedures,- Laser standard operating procedures (operations, controls, registrations, trainingand incident reporting).2.6 ASSUMPTIONS AND DEPENDENCIES
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THE LGSF LASER SYSTEM - Thirty Meter Telescope

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