Venting the CFHT Dome

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Vent Units Junction Boxes 120 V line DOME E<strong>the</strong>rnet Switch Vent power and control Breaker Panel Transformer 480 V 3-phase slip ring 120 V slip ring E<strong>the</strong>rnet BUILDING High Level Control
• Initially RO can select between 3 modes of operation – no “random” RO control permitted - Mode 1 fully closed – wind, rain, snow, daytime – whatever mode - Mode 2 all vents fully open, vanes pointed 20 degrees – directly into wind - Mode 3 vents fully open vanes 20 degree down into wind, BUT to reduce wind shake: a) upwind vent(s) 1/3 closed or … b) upwind vent(s) 2/3 closed or … c) upwind vent(s) fully closed • Reconfigure vents only if telescope is tracking (avoids crazies during slews) • Reconfigure vents only if dome rotated more than 10 degrees
Page 1 and 2: Steve Bauman CFHT Users’ Meeting
Page 3 and 4: Optical turbulence (facility seeing
Page 5 and 6: • Understand air flow in and arou
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 44 and 45: The Image Quality Improvement Progr
Page 46: MegaCam storage electronisc - SOLVE

Venting the CFHT Dome

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