1. 1 LBT Q1 2009 Eng/SW Review ECS: Enclosure Control System

2. 2 Highlights (Q1/2009) We continue to monitor enclosure track, due for another bevelling We continue to monitor enclosure track, due for another bevelling Enclosure rotation ran at 1.5 deg/sec without problems, however, when tried to repeat when cold, it didn’t work Enclosure rotation ran at 1.5 deg/sec without problems, however, when tried to repeat when cold, it didn’t work Dew point of compressed air lines to mirror cells is below -80 deg C and is now monitored in the ECS GUI, alarms are active Dew point of compressed air lines to mirror cells is below -80 deg C and is now monitored in the ECS GUI, alarms are active ECSGUI bugs fixes and improvements are being addressed as time is available ECSGUI bugs fixes and improvements are being addressed as time is available

3. 3 Open Issues Technical – almost no change Technical – almost no change Snow melt dampers in enclosure roof Snow melt dampers in enclosure roof Leaks along the roof, some repairs have been completed Leaks along the roof, some repairs have been completed High bay roof repair, scheduled for Q2 if funds available High bay roof repair, scheduled for Q2 if funds available Brush seals for rotating enclosure and vent doors Brush seals for rotating enclosure and vent doors Schedule Schedule All these issues take time and resources to fix, other more urgent things seem to pre-empt these tasks All these issues take time and resources to fix, other more urgent things seem to pre-empt these tasks Financial Financial Order parts for roof repair, contract to complete the work, ~$75k Order parts for roof repair, contract to complete the work, ~$75k Resources Resources Roof repair, seal design, … Roof repair, seal design, …

4. 4 Planning (Q2/2009) Implement software updates in ECS GUI for changes made to the ECS Implement software updates in ECS GUI for changes made to the ECS Finish lightning shoe refit on 3U Finish lightning shoe refit on 3U High bay roof repair High bay roof repair