[Halld-cal] BCAL fully inserted into magnet

[Elton Smith]

Dear collaborators,

Today we completed the insertion of the BCAL into the solenoid. Tim 
coordinated the effort as Tom was on vacation this week. But it took 
essentially all the Hall D technical staff working together to make this 
happen safely. We started yesterday and got about 3/4 of the way into 
the magnet. Today we started out by measuring the tension pulling the 
BCAL, which was about 12,000 lbs once it got moving. The initial tug to 
get it started after sitting overnight was about 17,000 lbs. By noon the 
calorimeter was within 1" of its final location. There was a slight 
interference at the end of the pull, which required an adjustment to the 
pulling fixture. The modification was completed after lunch and the 
detector was pulled into its resting position, about 1 mm from the mark 
on the magnet. The gap between the flat side of the modules and the iron 
is about 7/8" +/- 1/8", measured by ruler. The BCAL will be surveyed on 
Monday and accurate as-built positions will be determined.

Cheers, Elton.

-- 
Elton Smith
Jefferson Lab MS 12H5
12000 Jefferson Ave STE 16
Newport News, VA 23606
(757) 269-7625
(757) 269-6331 fax