# With CLEO detector gone, CHESS facility looks back, ahead

Three months ago, without a whole lot of fanfare, an era in particle physics at Cornell came to an end.

On Sept. 6, the 26-ton solenoidal superconducting magnet was carefully removed from the Wilson Synchrotron Laboratory. This was the last vestige of the CLEO detector, which for nearly 30 years recorded data produced from the collision of positively and negatively charged electrons that hurtled around the 840-yard subterranean collider, CESR (Cornell Electron-positron Storage Ring).

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