ATLAS Toroid lowered into cavern at CERN
The first Toroid End Cap magnet just before it was placed in the ATLAS cavern. (Click on image for larger version.)
What do you get when you cross a 260-ton magnet with an experienced and talented assembly team at CERN? The successful installation of the first Toroid End Cap magnet for the ATLAS detector, which was completed early last week.
This 12-meter tall component complements the barrel toroid magnet, one of the largest magnets ever built. The size is necessary to produce magnetic fields tens of meters across within the ATLAS detector. Such fields are critical in measuring muons, the longest lasting of the unstable elementary particles.
In addition to being very large, the toroid end-cap magnets are also very delicate, containing eight super conducting magnetic coils.
"It was one of the most difficult objects we have had to lower into the cavern," said ATLAS project engineer Mark Hatch.
Using the 280-ton overhead crane---not the most agile of machines---the team at CERN carefully lowered the End Cap 240 feet into the ATLAS cavern. They then fit it into place within the Barrel Toroid, the main piece of magnetic hardware, without damaging any of the experiments many sensitive components.
Teams from SLAC have been involved with the ATLAS experiment for the past 11 months. Projects include work on the pixel detector, the trigger, and the commissioning of studies. (Click here to read a related SLAC Today story.)
-- Ken Kingery, SLAC