1. BaBar LST Upgrade Richard F Boyce
Ohio State University Meeting April 2003

2. The BaBar Detector consists of a central barrel with a pair of doors at each end
Rear Doors
Barrel
Forward Doors

3. A section through the detector shows its complexity

4. The BaBar Barrel Calorimeter is supported by four cantilevered arms

5. The 3 and 9 o’clock corner plates support the Barrel Calorimeter
Let’s replace the top and bottom chambers

6. This is the barrel calorimeter support to be removed

7. The plates sag under gravity load, this increases with the brass load

8. How much does the detector change shape with the removal of the corner plates? Less than 0.2 mm!

9. Make a work platform to remove the old RPC’s

10. View of top work platform without BaBar

11. Side view of top work platform