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The current HLS-II storage ring uses a double-bend achromat (DBA) lattice with two straight sections. To enhance its performance, a future upgrade was recently proposed with the goal of increasing the insertion device brightness by over an order of magnitude, while utilizing the existing tunnel. To achieve this goal, the number of bending magnets must be significantly increased, which will result in very tight space situation in the lattice design. To address this challenge, in this paper, we develop a novel lattice based on the concept of complex unit cell. In the lattice design, two triple-bend (TB) lattice cells replace the current DBA lattice cell. The sextupoles are located only at both ends of dispersive straight sections. Compared to HLS-II, the emittance of this new lattice is reduced by approximately an order of magnitude while maintaining adequate nonlinear dynamics performance.
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