“…with B 0 = B z (r = 0, z = 0), r the radial position and ρ 0 the radius of the nominal trajectory, also called reference orbit. E.g., the index value for the MIRRORCLE systems is n = 0.72 [4,5,6,7,8,9]. This value gives the horizontal tune Q x = √ 1 − n = 0.529 and the vertical tune Q z = √ n = 0.848 of the storage ring.…”