Precision measurements of the SLC beam energy

A method of precisely determining the beam energy in high-energy linear colliders has been developed using dipole spectrometers and synchrotron radiation detectors. The method of measurement indirectly observes the deflection of charged beams via the narrow beams of synchrotron radiation they emit. Beam lines implementing this method have been installed on the Stanford Linear Collider (SLC). An absolute energy measurement with an accuracy of better than delta E/E=5*10/sup -4/ can be achieved on a pulse-to-pulse basis. The operation of this system is described.<
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