Measuring the energy of MeV-electrons produced by high-current electron accelerators

A device for measuring the kinetic energy of monoenergetic electrons over an energy range of 2-4 MeV is described. The measuring technique is based on an empirical dependence of the kinetic energy on the extrapolated range of electrons in copper. The measuring procedure is presented, and experimental data compared to the results from studying small-angle electron scattering under planar channeling in silicon. The error in determining the energy is as high as 1%. The device and the empirical dependence are applicable to the energy calibration of electron beam monitors. (authors)