Beijing Electron–Positron Collider II

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The Beijing Electron–Positron Collider II (BEPC II) is a Chinese electron–positron collider, a type of particle accelerator. It has been in operation since 2008 and has a circumference of 240m.

BES III[edit]

The BES III (Beijing Spectrometer III) is the main detector [1] for the upgraded BEPC II.

BES III uses a large superconducting solenoid (the most powerful magnet in China[citation needed]) to provide a 1-tesla magnetic field, and also features a helium gas-based tracking chamber and a calorimeter using 6240 caesium iodide crystals.

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