[en] The results are presented of the experimental check of the electron motion stability in axial-circular, constant- in-time magnetic field. A couple of quadrupole lenses was set on the ring. When switching the lenses off the value of the particle vertical drift is in good agreement with the theory. At switching them on the electron motion in the ring turns stable. During the experiment the electrons in the ring made some 60 turns. The scattering on the residual gas accounts for the finite time of the electron beam existence in the ring. The results confirm the possibility of construction of charged particle accelerators with a constant- in-time axial-circular magnetic field