Boundary of electron beam release in betatron with comb-type poles

Boundary of electron beam release in betatron with comb-type poles has been determined. It was shown that at the moment of beam extraction electron release from the influence of electromagnetic field focus forces on the border of comb and cavity of betatron poles. Beam particles in the process of extraction are grouped on azimuths located near lateral edges of pole combs. The results of researches may be practically applied when developing formation and extraction systems of betatron electron bea