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The radiation friction force acting on a relativistic electron in incoherent fields of spontaneous undulator radiation of other beam electrons moving in a spatially periodic magnetic field of the undulator is considered. An expression for the radiation friction force, both for the initial stage of the pre-Brownian motion of electrons and for the kinetic stage is obtained. Considering a helical undulator in the approximation of a small value of the undulator parameter, the dependences of the radiation friction force on both the value of the longitudinal momentum and the distance traveled by the electrons in the undulator were found. The dependence of the friction force on the value of the initial thermal energy spread is analyzed. It is shown that the radiation friction force is proportional to the density of the electron beam. Radiative friction and diffusion may lead to a change in the initial distribution of electron momenta, and consequently affect on the formation of stimulated emission.
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