1. 1 LBT Q3 2008 Eng/SW Review ECS: Enclosure Control System

2. 2 Highlights (Q3/2008) We continue to monitor enclosure track, recently performed PM on the rail: bevelling the edges, cleaning the track, and torquing all of the bolts We continue to monitor enclosure track, recently performed PM on the rail: bevelling the edges, cleaning the track, and torquing all of the bolts Enclosure rotation runs at 1.5 deg/sec without problems, just a little noisy Enclosure rotation runs at 1.5 deg/sec without problems, just a little noisy The dewpoint of the compressed air lines to the mirror cells is hovering around -100 deg C The dewpoint of the compressed air lines to the mirror cells is hovering around -100 deg C E-stop bypass push buttons have been installed and tested on vent doors and shutter doors E-stop bypass push buttons have been installed and tested on vent doors and shutter doors Installed another two new latch station donuts (SL1011 and SL0704 closed positions). They are performing well. Installed another two new latch station donuts (SL1011 and SL0704 closed positions). They are performing well. Latch stations: no failures for the last two quarters, completed PM on all latch stations again this fall. Latch stations: no failures for the last two quarters, completed PM on all latch stations again this fall. Temporary patch of building roofs Temporary patch of building roofs ECSGUI bugs fixes and improvements will be made when time is available ECSGUI bugs fixes and improvements will be made when time is available

3. 3 Open Issues Technical – almost no change Technical – almost no change Latch station donut installation of inside donuts requires shutter open Latch station donut installation of inside donuts requires shutter open Finish repair of SL0716 Finish repair of SL0716 Enclosure snow melt dampers in enclosure roof Enclosure snow melt dampers in enclosure roof Leaks along the roof Leaks along the roof High bay roof repair High bay roof repair Brush seals for rotating enclosure and vent doors, have potential solution Brush seals for rotating enclosure and vent doors, have potential solution New design for latch stations New design for latch stations Schedule Schedule Time to install new donuts for the latch stations, brush seals Time to install new donuts for the latch stations, brush seals Financial Financial Order parts Order parts Installation of roof panels next year Installation of roof panels next year Resources Resources Roof repair, seal design, … next year Roof repair, seal design, … next year

4. 4 Planning (Q4/2008) Implement software improvements in the ECS GUI for dewpoint sensors and other changes made to the ECS Implement software improvements in the ECS GUI for dewpoint sensors and other changes made to the ECS Install remaining new latch station donuts where needed Install remaining new latch station donuts where needed