Measurement of the BESSY II electron beam energy by Compton-backscattering of laser photons

摘要

Accurate knowledge of all storage ring parameters is essential for the Physikalisch-Technische Bundesanstalt (PTB) to operate the electron storage ring BESSY 11 as a primary source standard. One parameter entering the Schwinger equation for the calculation of the spectral photon flux of bending magnet radiation is the electron beam energy. So at BESSY 11 the electron beam energy is measured by two independent techniques one of which is described in this paper: the photons from a CO-laser are scattered in a head-on collision with the stored electrons. From the spectrum of the backscattered photons that are detected by an energy-calibrated HPGe detector the electron beam energy can be determined. The experimental set-up at the BESSY 11 electron storage ring as well as the current experimental status are described for operation of the storage ring at the energies of 900 and 1700 MeV. (C) 2001 Elsevier Science B.V. All rights reserved. References: 10