Venting the CFHT Dome

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• image quality degrades when : • dome air temp differs from outside air • the dome slit points downwind • observing near the zenith
• Understand air flow in and around the dome – limits on improvements •Fluid dynamics consultants and literature •Water tunnel tests of 160:1 scale model •Computational fluid dynamics models • Understand the dome structure and limitations to vent design / installation •Excellent set of construction drawings from Brittain Steel (DSL) •Computer solid model of dome and telescope • Contract structural design firms to develop vents within budget, schedule and existing structure •Structural analysis of the vented dome •Detail and fabrication drawings •Fabrication •Installation
Page 1 and 2: Steve Bauman CFHT Users’ Meeting
Page 3: Optical turbulence (facility seeing
Page 7 and 8: • terraced terrain model • flow
Page 9 and 10: Vortex scours cold air and lifts it
Page 11: Large fraction of flow continues in
Page 19 and 20: Bids solicited from 8 pre-selected
Page 21 and 22: Vertical gores - ¼ inch steel plat
Page 23: vents delivered as assembled units
Page 39: • Initially RO can select between
Page 44 and 45: The Image Quality Improvement Progr
Page 46: MegaCam storage electronisc - SOLVE

Venting the CFHT Dome

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