Determination of the beam energy of an electron storage ring by using calibrated energy dispersive Si(Li)-detectors

Abstract

The spectral photon flux of the synchrotron radiation of the storage ring BESSY was measured with calibrated energy dispersive photon counters at photon energies E around 20 E c. From these data the characteristic photon energy E c was determined with a uncertainty of 0.4% and the electron energy W was calculated from E c and the magnetic induction for storage ring optics with nominal beam energy of W = 337, 756 and 854 MeV. For the high electron energies the resulting electron energy agrees with W derived from the resonant spin depolarization method, which cannot be used at W = 337 MeV.