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In recent years, a new generation of storage ring based light sources, knownas diffraction limited storage rings (DLSRs), whose emittance approaches thediffraction limit for the range of X ray wavelengths of interest to thescientific community, has garnered significant attention worldwide. Researchershave begun to design and build DLSRs. Among various DLSR proposals, the hybridmultibend achromat (HMBA) lattice enables sextupole strengths to be maintainedat a reasonable level when minimizing the emittance; hence, it has been adoptedin many DLSR designs. Based on the H7BA lattice, the design of the AdvancedPhoton Source Upgrade Project (APSU) can effectively reduce emittance byreplacing six quadrupoles with antibends. Herein, we discuss the feasibility ofdesigning an APSU type HMBA lattice for the Southern Advanced Photon Source, amid energy DLSR light source with ultralow emittance that has been proposed tobe built adjacent to the China Spallation Neutron Source. Both linear andnonlinear dynamics are optimized to obtain a detailed design of this type oflattice. The emittance is minimized, while a sufficiently large dynamicaperture (DA) and momentum acceptance (MA) are maintained. A design comprising36 APSU type H7BAs, with an energy of 3 GeV and a circumference of 972 m, isachieved. The horizontal natural emittance is 20 pm rad, with a horizontal DAof 5.8 mm, a vertical DA of 4.5 mm, and an MA of 4%, as well as a longlongitudinal damping time of 120 ms. Subsequently, a few modifications areperformed based on the APSU type lattice to reduce the longitudinal dampingtime from 120 to 44 ms while maintaining other performance parameters at thesame level.

Design Study of APSU Type Hybrid MBA Lattice for Mid Energy DLSR