Abstract
We discuss a magnet alignment method, in which a couple of focusing and defocusing magnetic elements such as quadrupoles and sextupoles are treated as a unit like a nonlinear lense, for the reduction of the sensitivity to their misalignment in low emittance synchrotron radiation sources. The sensitivity reduction is closely related to the characteristic lattice and linear optics of the radiation sources. The feature of this method is that the object of highly precise alignment can be restricted to the inside of each unit, which is straight and shorter than several meters. The formulae for the expected values of horizontal and vertical orbit distortions are derived in consideration of unit alignment. By using these formulae and computer simulations, effects of the method on the reduction of sensitivity to the quadrupole misalignment are investigated in detail for the storage ring of SPring-8 as an example. The effects on the correction of the closed-orbit distortion (COD) and the dynamic aperture are also investigated by means of computer simulations. The results of this study show that the magnet alignment method based on unification of the magnets in each straight section has a potential to reduce the sensitivity to misalignment of quadrupoles and sextupoles in low emittance synchrotron radiation sources.
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