This is inside of the Arm #1 detector. The light green elements at the bottom measure energy of particles, while the cascade of nearly 1000 fibers carry light signals. The size of the detector is about 11" x 24". Courtesy of CERN.
| Part of the LHCf experiment. 2008, Courtesy of CERN.
| Arm #1 detector installed in the neutral particle absorber (TAN) in the LHC tunnel. Courtesy of CERN.
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