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SMT Control System

SMT Control System. Steward Observatory Faculty Meeting May 02, 2003. A rizona R adio O bservatory. Thomas W. Folkers. SMT: Specifications. Elevation: 10,435 ft. Dish: 10 Meter. F/D = 0.35 Mount: Azimuth – Elevation. Focus: Nasmyth or Bent Cassegrain.

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SMT Control System

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  1. SMT Control System Steward Observatory Faculty Meeting May 02, 2003 Arizona Radio Observatory Thomas W. Folkers

  2. SMT: Specifications • Elevation: 10,435 ft. • Dish: 10 Meter. F/D = 0.35 • Mount: Azimuth – Elevation. • Focus: Nasmyth or Bent Cassegrain. • Surface: 60 Adjustable CFRP Panels. • Accuracy: 15 microns RMS. • Pointing: < 2 arc seconds, RMS on Sky. • Tracking: < 0.2 arc seconds. RMS • Support: CFRP & Steel. • Total Weight: 41,500 Kg, (46 Tons) • Building: 650 Tons.

  3. Old SMT Control System • VMS Based Vax System. • Telescope Commissioned in 1993 with Outdated CAMAC Bus System. • Spare Parts Increasingly Impossible to Come by. • Monolithic Control System Design. • Limited Data Acquisition Speed. • Text Based Interface. • No Remote Observing and Limited Debugging.

  4. New Control System • Graphical User Interface. ( Xwindows ) • Network Based Distributed Parallel Processing. • Remote Observing. • Remote Debugging. • Remote Operation Possible. • Higher Data Rates. ( Up to 20X for OTF) • Non-Propriety Hardware. ( PCI / ISA / PC104 ) • Non-Propriety Operating Systems. ( Linux ) • Compatible with 12 Meter.

  5. Operator’s Control Computers • Main Control Computers: • (3) Dual Pentium Processor Systems. • Six LCD Displays. • Runs All Non Real Time Processes. • Displays all Status and Data Readouts.

  6. SMT Control Room

  7. Computer Room Before After

  8. Computer Room (before)

  9. Computer Room (After)

  10. Spectral Line Backends • Filters Banks: • VxWorks Based. • 128 x 62.5 Khz Filters. • 256 x 250 Khz Filters. • 256 x 1 Mhz Filters. • Acousto-Optical-Spectrometers: • RT-Linux Based. • (3) Units of 2048 Channels each. • (2) 1 Ghz Bandwidth. 1Mhz/Channel. • (1) 250 Mhz Bandwidth. 385 Khz/Channel. • Chirp Transform Spectrometer: • RT-Linux Based. • (3) Identical Units of 4096 Channels. • 183 Mhz Bandwidth. 43Khz/Channel. • (1) Unit Installed.

  11. Spectral Line OTF Map

  12. Continuum Backend • Digital Back End: • RT-Linux. • Capable of Capturing Data From 1 of 2 banks of 20 backends simultaneously. • Generates Station Timing Signals.

  13. DBE Computer

  14. 19 Channel Bolometer Continuum OTF Map

  15. Auxiliary Telescope Systems • Apex Control Computer: • Sub-Reflector Nutation. • Telescope Focus. • FMS Control Computer: • GPIB Control of IF & LO Synthesizers. • Reads Inclinometers & Building Currents. • Receiver IF & LO Routing Switches.

  16. Pointing Systems • Optical Pointing: • Linux Based Frame Capture System. • Apogee KX1E CCD Frame Transfer Camera. • 768 x 512 Pixel Resolution. • 0.766 Arc Second/Pixel. • 30ms to 173 Minute Integration Times. • Thermo-Electrically Cooled. • Used to Fit 4 of 9 Pointing Model Parameters.

  17. Pointing Systems: (optical)10 Minute Optical Exposure. Digitally Enhanced Histogram

  18. Pointing Systems (cont) • Inclinometers: • (2) Sets of Orthogonal Mounted Inclinometers. • Use to Monitor Telescope Mount Tilt. • Real Time Updates of Tilt Terms.

  19. Pointing Systems (inclinometers)

  20. Analysis Systems • Observer Workstation: • Dual Processor Pentium. • Dual LCD Displays. • 150 Gbytes Storage for Reduced Data. • Linux Based Analysis: • Class • NIC • Aips • Unipops (Future)

  21. File Server • File Server: • 360 Gbytes of Raw Data Storage. • All Spectral Line Data Handling Processes Run Here. Minimizes Data Transfer Time.

  22. Future Plans • Additional Observer’s Linux Workstations At Both Mt. Graham and in Tucson. • Remote Observing Station in Tucson. • Improved Continuum Pointing Routines. • Kitchen and Lounge On-Line Displays. NOTE: Power Savings: Old System vs New. UPS Load Reduced from 65% to 42%. A Difference of 5.52 KW. @ $0.32 per KWH We Save ~$15,400 / Year.

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