The beam energy measurement system for the Beijing electron-positron collider
Abstract
The beam energy measurement system (BEMS) for the upgraded Beijing electron-positron collider BEPC-II is described. The system is based on measuring the energies of Compton back-scattered photons. The relative systematic uncertainty of the electron and positron beam energy determination is estimated as 2 · 10-5. The relative uncertainty of the beam's energy spread is about 6 %.
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