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SAC Report

SAC Report. Povilas Palunas. Primary Mirrors. Primary Aluminizing Schedule back on track Baade aluminized in Jan after 4 years. 3% gain over washing. Modifying CO 2 cleaning procedure to improve uniformity Baade M3 washed due to failure of du Pont tank

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SAC Report

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  1. SAC Report Povilas Palunas

  2. Primary Mirrors • Primary Aluminizing Schedule back on track • Baade aluminized in Jan after 4 years. 3% gain over washing. • Modifying CO2 cleaning procedure to improve uniformity • Baade M3 washed due to failure of du Pont tank • Reflectivity 88.3% in blue compared to 91.7% for the freshly aluminized primary. • ADC cleaned with acetone – the coatings are failing.

  3. Earthquakes! • Two significant earthquakes • Nov 14 end of f/5 run--starting AO commissioning • Mag 6.1 epicenter 59km depth 61km • Jan 30 end of Baade wash • Mag 6.7 epicenter 94km depth 47km • Both quakes had an effect on Clay collimation • In the second quake the secondary required 1mm offset to remove coma. In the following engineering the position values were back close to nominal.

  4. Transparency • Started projects to monitor site transparency. • DIMM poor sky coverage but limited number of stars and systematics • CASCA full sky coverage more systematics and data handling Project completion is resource limited

  5. f/5 • Changeovers becoming reasonably routine • Primary issue is scheduling Juan Gallardo • f/11MegaCam takes more than one day but on sky engineering done on the first night • Telescope collimation easier with MegaCam

  6. AO Run • Guider functional but not complete • Glycol above the primary • Controls installed to stop a system leaks • Vibrations • Primary Mirror Cooling system glycol pump • CLIO LN2 vacuum pump (will be moved) • AO CCD cooling circuit (?) • Rotator control problem • Rotator not tracking to spec after telescope offsets

  7. GMT • Supported GMT primary mirror phasing camera test run • Other • Primary mirror Temperature distribution • Adaptive optics performance • Test of coarse lenslet array • Telescope Vibration • Dust analysis • Weather

  8. Space • We are filling up. To ASB

  9. Safety • Two accidents on site this year: • Chemical spill • Broken leg • Hard hats and safety shoes required for everyone at lifts and moves. • Working on official procedures for all major tasks • New safety system • Cell cart scaffold • Primary mirror cover access • Inner catwalk (for 2nd changes)

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