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Mauna Kea Site Testing

Mauna Kea Site Testing. Mark Chun (UH-IfA), Jake Jacobson, Alan Hatakeyama (Gemini). DIMM Project Status. Hired Jake Jacobson Funded by NIO, CELT, IfA Supported by Gemini and CFHT Trained and in normal operating mode Improvements to packaging and s/w. Cross Calibration.

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Mauna Kea Site Testing

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  1. Mauna Kea Site Testing Mark Chun (UH-IfA), Jake Jacobson, Alan Hatakeyama (Gemini)

  2. DIMM Project Status • Hired Jake Jacobson • Funded by NIO, CELT, IfA • Supported by Gemini and CFHT • Trained and in normal operating mode • Improvements to packaging and s/w

  3. Cross Calibration • GSM Run (Nov/Dec) • Only two nights of useful DIMM data (manpower, winds) • 1st night : bad seeing, agreement between DIMM/GSM

  4. 16 November 2001

  5. Cross Calibration • GSM Run (Nov/Dec) • Only two nights of useful DIMM data (manpower, winds) • 1st night : bad seeing, agreement between DIMM/GSM • 2nd night : better seeing, DIMM/GSM disagree • Star flux drops by factor of ten

  6. 17 November 2001

  7. Cross Calibration • GSM Run (Nov/Dec) • Only two nights of useful DIMM data (manpower, winds) • 1st night : bad seeing, agreement between DIMM/GSM • 2nd night : better seeing, DIMM/GSM disagree • Star flux drops by factor of ten • DIMMs together at CFHT Weather Tower • Jake Training

  8. Cross Calibration Results

  9. MK Plan • Mode of operation: Semi-automatic • Jake sets up DIMMs at twilight • One at 13N, One at CFHT Weather tower • Manually selects and points telescope to target • Pickup in East HA~-1 to -1.5 • Limit to brighter than V<2. • Telescope/DIMM S/W guides for ~2-3 hours • Jake then changes stars for both DIMMs

  10. MK Plan • Goal : 50% of “useful” nights ~ 140 nights • Funded for 200+ nights • Month CFH 13N 88“ HPQ1 42 24 12 6Q2 40 28 12 0Q3 40 40 0 0Q4 38 38 0 0Total 160 130 24 6

  11. Planned Distribution of Tests 13N CFH UH 88”

  12. Jake’s Efficiency • WEATHER 20 • WASTED 1 • MISSED 9 • OFF/WKEND 13 • TRAINING 7 • ENGR 2 • GOOD DATA 13 • TOTAL 65 nights Jake ~ 50%

  13. 13N & CFH: Histogram

  14. 13N & CFH: Comparison

  15. 13N & CFH: Wind Effects

  16. Set up time is improving… • Concern is now lifetime of parts • Failure of hand controller • Occasional failure of one laptop • One telescope AZ drive failing?? • Plan to purchase • Spares of all components • GPS units • New Eyepieces • Still need a ~5m tower for equipment

  17. DIMM Near-Future tasks • Subaru • Comparison at Subaru this week • Add occasional additional data points about the summit • Subaru DIMMs are run a few nights per month • G-SCIDAR + possibly several other experiments in October & December on MK

  18. G-SCIDAR at UH88” Oct/Dec • Goals • Obtain full turbulence/wind profiles for MK • AOS on MK, ELT on MK • Add to Classical SCIDAR data from late 80s • Introduce MK Community to other site monitoring instruments • MASS, GSM? • Test ground/boundary layer strength and distribution • Balloons or kite • Provide CN2(h) for AOS runs on Keck and Gemini

  19. G-SCIDAR at UH88” Oct/Dec • Groups • UH - IfA, SOEST/DIMMs and UH88” • CELT - Matthias • CTIO - MASS? • UNICE - Aziz Ziad & Jean Vernin /G-SCIDAR • CfAO - Eric Steinbring/AO Calibration • UNH,Air Force - John McHugh/LIDAR, George Jumper/Balloons/Kite • Gemini/Keck? – Ellerbroek/Altair, Winzinowich/KAO? • Status • Telescope set, Only G-SCIDAR funded

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