Observation of Relativistic Electrons Deflection by a Bunch Coulomb Field

According to the E.L. Feinberg viewpoint on the possibility of a semi-bare electron state we may expect a state of electron with non-equilibrium Coulomb field during the time range of {\gamma^2 \lambda/c}, where {\gamma} is the Lorents-factor of electron, c is light velocity and {\lambda} is the wavelength corresponding to a frequency in Fourier expansion of the Coulomb field of relativistic electron. If this non-equilibrium Coulomb field has a spatial asymmetry, a relativistic electron may be deflected by its own Coulomb field. For the {\gamma^2 \lambda/c=1m} we may observe this effect in macroscopic mode when the electrons are grouped in bunches with the population Ne=10^8. We present in this paper the experimental observation of the deflection of an electron beam by an asymmetrical non-equilibrium Coulomb field of electron bunch. The experiment was performed on the relativistic electron beam of the microtron of Tomsk Polytechnic University.