title: Measurement of the electron energy and energy spread at the electron storage ring BESSY I.
abstract: Knowledge of the electron energy with a small uncertainty is necessary for the Physikalisch-Technische Bundesanstalt (PTB) to operate the electron storage ring BESSY I, and the future BESSY II, as a primary radiation source standard of calculable synchrotron radiation. At BESSY I the electron energy can now be measured either by the long-established method of resonant spin depolarization or by the newly set up method of Compton backscattering (CBS) of laser photons (CO(2) laser, lambda = 10.6 micro m). Results obtained at different electron energies by these two independent methods are presented. They agree within a relative uncertainty of better than 10(-4). The advantages and disadvantages of these two complementary techniques are described and applications of CBS for the measurement of other storage-ring parameters, e.g. the electron energy spread, are given.
authors.affiliation: Physikalisch-Technische Bundesanstalt, Abbestr. 2-12, D-10587 Berlin, Germany.
authors.forename: R
authors.initials: R
authors.lastname: Klein
authors.forename: T
authors.initials: T
authors.lastname: Mayer
authors.forename: P
authors.initials: P
authors.lastname: Kuske
authors.forename: R
authors.initials: R
authors.lastname: Thornagel
authors.forename: G
authors.initials: G
authors.lastname: Ulm