Abstract
A modified quadruple bend achromat (QBA) optics as a lattice for a low emittance storage ring is presented. The novel feature of this lattice is the use of horizontally defocusing bending magnets with different bending angles to keep the radiation integrals low. A realistic storage ring with six achromats, non-dispersive straight sections of 4.6 m each and a total circumference of 124.8 m is studied. At an energy of 2.5 GeV the emittance yields only 20 π nm rad. The chromaticities and the sextupole strengths are moderate, the dynamic aperture is large and the momentum acceptance is more than ± 9% relative. A similar 3 GeV storage ring with 12 achromats and a circumference of 300 m yields an emittance of 3 π nm rad. Possible applications and extensions of the QBA structure for diffraction limited storage rings are discussed.
Published Version
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