Towards the ultimate storage ring: The lattice design forBeijing Advanced Photon Source

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XU Gang and JIAO Yi. Towards the ultimate storage ring: The lattice design forBeijing Advanced Photon Source[J]. Chinese Physics C, 2013, 37(5): 057003. doi: 10.1088/1674-1137/37/5/057003
XU Gang and JIAO Yi. Towards the ultimate storage ring: The lattice design forBeijing Advanced Photon Source[J]. Chinese Physics C, 2013, 37(5): 057003.  doi: 10.1088/1674-1137/37/5/057003 shu
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Received: 2012-07-02
Revised: 1900-01-01
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Towards the ultimate storage ring: The lattice design forBeijing Advanced Photon Source

Abstract: A storage ring-based light source, Beijing Advanced Photon Source (BAPS), is proposed to store a 5 GeV low-emittance electron beam and to provide high-brilliance coherent radiation. In this paper, we report our efforts of pushing down the emittance of BAPS to approach the so-called ultimate storage ring, while fixing the circumference to about 1200 m. To help deal with the challenge of beam dynamics associated with the intrinsic, very strong nonlinearities in an ultralow-emittance ring, a combination of several progressive technologies is used in the linear optics design and nonlinear optimization, such as a modified theoretical minimum emittance cell with small-aperture magnets, quasi-3rd-order achromat, theoretical analyzer based on Lie Algebra and Hamiltonian analysis, multi-objective genetic algorithm and frequency map analysis. These technologies enable us to obtain satisfactory beam dynamics in one lattice design with natural emittance of 75 pm.

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