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In a collider final focus (FF) system chromaticity generated by FFquadrupoles is compensated by sextupole pairs with -I map in between to cancelgeometrical aberrations. However, it works perfectly only for zero-lengthsextupole kicks; for realistic thick magnets only quadratic aberrations arecancelled exactly while higher order terms appear and may deteriorate thetransverse dynamic aperture. The latter is particularly important forprospective projects of the future circular colliders based on the Crab-Waistcollision approach where extremely low beta at IP generates very largechromatic effects. In the present paper, we study these high aberrations by thepower series technique and propose the method of the dynamic aperture recover.Results of analytic study are compared with those obtained by tracking.

Effect of the Sextupole Finite Length on Dynamic Aperture in the Collider Final Focus