On Monday, June 7, the second of two focusing horns for the NuMI beamline
was successfully installed underground.
"This is a significant step forward," said NuMI physicist Jim Hylen.
"It was completed on schedule, and illustrates that NuMI is on track
to be ready for beam after the summer shutdown."
Kris Anderson engineered the horns, which focus the pions, emitted from
collisions of 120 GeV protons with the NuMI target into the decay pipe.
There the pions decay into muons and neutrinos. Hiep Le and the NuMI/MiniBooNE
group from the Accelerator Division's Mechanical Support Department
assembled and installed both horns, which are located 10 meters apart and
surrounded by five feet of
steel shielding. More than six years of design,
engineering, prototyping, construction and testing went into the two horns,
the first of which was installed June 1. Still ahead: connecting the water
and power lines and then testing the horns in their new positions.
"It's been a long road to get this far," said Hylen. "Everyone did a superb job."