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The Gemini Telescope(s) An Instrumentation Intro

This document provides an introduction to the instrumentation of the Gemini Telescope, covering optical parameters, environmental constraints, computer architecture, and control systems. Explore the telescope's optical specifications, mounting requirements, environmental services, and computer network infrastructure within the observatory context. Key details include the telescope's focal length, primary focal ratio, actuator count, instrument support structure, and operating environments.

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The Gemini Telescope(s) An Instrumentation Intro

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  1. ExAOC Kickoff Meeting June 7th, 2004 CfAO (Santa Cruz) Les Saddlemyer The Gemini Telescope(s)An Instrumentation Intro

  2. Telescope introduction Telescope optical parameters Instrument mounting/space envelope Instrument environment/services Computer/network infrastructure Context within Observatory Outline

  3. F/16 Richey-Chretien M1 8.1m dia, 0.2m thick Focal length 128m Primary focal ratio 1.8 Unvignetted field 3.5 arcmin Actuators 120 Telescope Optical Parameters (p1)

  4. M2 1.022m dia with 0.169m central hole Forms system stop, equiv. To 7.98m on M1 Lightweighted ULE A few Hz bandwidth Telescope Optical Parameters (p2)

  5. ISS

  6. Instrument Support Structure (ISS)

  7. Instrument mounting(GMOS example, bottom port)

  8. Telescope Environments Sea level to 4300m -15C to +25C Relative humidity 0% - 100% (condensing) All gravity orientations

  9. Some Basic InstrumentConstraints Mass of 2000Kg (+/- very little) CofG 1000mm out from ISS face, centred on optical axis. < 50W released into air, < 50W conducted into ISS, no object in air > 2C above ambient.

  10. Services/Utilities • Coolant, 12 l/min • Helium (GM & Joule-Thomson) • Compressed dry air • IRIG-B time, Synchro-bus, Data & Control LAN (100 Mb, moving to 1 Gb), GIS multi-pair • Utility (i.e. dirty) power and UPS power • Dedicated fibres available

  11. Controls Context

  12. Realtime (VxWorks) Unix (Solaris/Linux) Control Hierarchy Ctrl Data OCS TCS Inst. (1 .. n) DHS

  13. Legacy VME/Motorola PPC EPICS Solaris hosted ‘Aspen’ Legacy Newer Motorola SBCs Synergy Micro SBCs Linux/RT Linux X86/PCI non-EPICS API under development Computer Architecture

  14. Conclusion • Mass/volume constraints challenging. • More flexibility in control systems available than in past • No real suprises!

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