FIELD: electric engineering. SUBSTANCE: device has poles, windings and chokes of magnetic circuit, which provide two dipole flat parallel magnets. Middle planes of inter-pole spaces coincide with lens focal plane. Projection of poles of magnets to focal plane provide shape of sectors which vertex is directed towards symmetry axis of lens and are displaced with respect to it. Chokes of magnetic circuit may be shared by both magnets and be bonded by non-magnetic pins. EFFECT: non-linear focusing of beams of charged particles. 2 cl, 4 dwg
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