The study of interaction of electrons with an electromagnetic wave in an undulator.

The results of an experimental investigation of electron beam spectral distribution after interaction with external electromagnetic waves in an undulator are given. The initial electron energy was 12 MeV, external electromagnetic wave power was 50 MW, the wavelength being 10 μm. A helical 20-cm-long undulator with a period length of 9.5 mm was used. The dependence of spectral distribution maximum change on undulator magnetic field strength was measured. The results are in good agreement, with estimated findings taking into account the real parameters of the experimental setup. Electron energy maximum change was ± 20 keV which is a result of electron acceleration or deceleration by the electromagnetic wave in the undulator. [ABSTRACT FROM AUTHOR]