LBT Q 3 2008 EngSW Review ECS Enclosure

LBT Q 3 2008 Eng/SW Review ECS: Enclosure Control System 1

Highlights (Q 3/2008) We continue to monitor enclosure track, recently performed PM on the rail: bevelling the edges, cleaning the track, and torquing all of the bolts 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 E-stop bypass push buttons have been installed and tested on vent doors and shutter doors Installed another two new latch station donuts (SL 1011 and SL 0704 closed positions). They are performing well. Latch stations: no failures for the last two quarters, completed PM on all latch stations again this fall. Temporary patch of building roofs ECSGUI bugs fixes and improvements will be made when time is available 2

Open Issues Technical – almost no change Latch station donut installation of inside donuts requires shutter open Finish repair of SL 0716 Enclosure snow melt dampers in enclosure roof Leaks along the roof High bay roof repair Brush seals for rotating enclosure and vent doors, have potential solution New design for latch stations Schedule Time to install new donuts for the latch stations, brush seals Financial Order parts Installation of roof panels next year Resources Roof repair, seal design, … next year 3

Planning (Q 4/2008) 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 4