Lower Emittance Lattice for the Advanced Photon Source Upgrade Using Reverse Bending Magnets

Borland, M.; Berenc, Tim; Lindberg, Ryan; Sajaev, V.; Sun, Yipeng

doi:10.18429/jacow-napac2016-wepob01

Cited by 8 publications

(8 citation statements)

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“…Based on the H-MBA concept, many modified H-MBA lattices have been developed and adopted in the designs of DLSR light sources, such as APS-U [7], High Energy Photon Source (HEPS) [18], Diamond-II [9] and Pohang Accelerator Laboratory -four-generation storage ring (PAL-4GSR) [19], which are summarized in Table 1. Some combined function magnets and super-bends were used in the modified H-MBA lattice designs to further reduce the emittance.…”

Section: Advent Of Aps-u-type H-mba Latticementioning

confidence: 99%

“…In the design of PAL-4GSR [19], super-bends with magnetic fields up to 2 T (similar to super-bends with magnetic fields up to 3.2 T in the design of Sirius [5]) were used to reduce the emittance and served as bending magnet sources to provide high-quality X-rays. Meanwhile, in the APS-U design, anti-bends [20] (which are bends with reverse bending angles that allow the independent control of beta and dispersion functions) were used to replace six quadrupoles of the H-7BA lattice, thereby reducing the emittance from 67 to 41 pm•rad [7].…”

Section: Advent Of Aps-u-type H-mba Latticementioning

confidence: 99%

“…Moreover, the damping time τ scales as N 3 /E 3 . The APS-U design is composed of 40 APS-U-type H-7BAs with an emittance of 41.7 pm•rad at 6 GeV, and a longitudinal damping time of 20.5 ms [7]. By scaling down the energy and number of 7BAs to 3 GeV and 36, respectively, i.e., the same numbers as those of the SAPS design, the emittance and longitudinal damping time will be 14.3 pm•rad and 119.6 ms, respectively.…”

Section: Linear Optics Designmentioning

confidence: 99%

“…Except the MBA [3] lattices used in MAX IV [4] and Sirius [5] designs, the H-MBA [6] lattice and modified H-MBA lattices (e.g., [7][8][9]), which are innovative variations of the MBA lattice, as will be introduced briefly in next section, have been widely adopted in the designs of DLSRs, particularly in high-energy DLSR designs.…”

Section: Introductionmentioning

confidence: 99%

“…However, many options are available for the lattice of low-and mid-energy storage rings (e.g., the 7BA lattice for PEP-X [10] and H-6BA lattice for the Diamond-II [9]). The "APS-U -type H-MBA" lattice [7], a concept that combines anti-bends (ABs) into a H-MBA, has been rarely used in mid-energy DLSR designs, particularly designs involving a long circumference. To investigate the feasibility of designing a mid-energy DLSR using the APS-U-type H-MBA lattice, a lattice of this type was designed for the Southern Advanced Photon Source (SAPS) in this study.…”

Section: Introductionmentioning

confidence: 99%

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Design study of APS-U-type hybrid-MBA lattice for mid-energy DLSR

2021

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In recent years, a new generation of storage ring-based light sources, known as diffractionlimited storage rings (DLSRs), whose emittance approaches the diffraction limit for the range of X-ray wavelengths of interest to the scientific community, has garnered significant attention worldwide. Researchers have begun to design and build DLSRs. Among various DLSR proposals, the hybrid multibend achromat (H-MBA) lattice enables sextupole strengths to be maintained at a reasonable level when minimizing the emittance; hence, it has been adopted in many DLSR designs. Based on the H-7BA lattice, the design of the Advanced Photon Source Upgrade Project (APS-U) can effectively reduce emittance by replacing six quadrupoles with anti-bends. Herein, we discuss the feasibility of designing an APS-U-type H-MBA lattice for the Southern Advanced Photon Source, a mid-energy DLSR light source with ultralow emittance that has been proposed to be built adjacent to the China Spallation Neutron Source. Both linear and nonlinear dynamics are optimized to obtain a detailed design of this type of lattice. The emittance is minimized, while a sufficiently large dynamic aperture (DA) and momentum acceptance (MA) are maintained. A design comprising 36 APS-U type H-7BAs, with an energy of 3 GeV and a circumference of 972 m, is achieved. The horizontal natural emittance is 20 pm•rad, with a horizontal DA of 5.8 mm, a vertical DA of 4.5 mm, and an MA of 4%, as well as a long longitudinal damping time of 120 ms. Subsequently, a few modifications are performed based on the APS-U-type lattice to reduce the longitudinal damping time from 120 to 44 ms while maintaining other performance parameters at the same level.

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Section: Advent Of Aps-u-type H-mba Latticementioning

confidence: 99%

Section: Advent Of Aps-u-type H-mba Latticementioning

confidence: 99%

Section: Linear Optics Designmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Design study of APS-U-type hybrid-MBA lattice for mid-energy DLSR

2021

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Design and comparison of hybrid multi-bend achromat lattices for HALF storage ring

Yang

Liu

et al. 2023

NUCL SCI TECH

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A seven-bend-achromat lattice option for the HALF storage ring

Xu¹,

Yang²,

Liu³

et al. 2022

J. Inst.

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The Hefei Advanced Light Facility (HALF) is a soft X-ray diffraction-limited storage ring being designed with an energy of about 2.2 GeV and an emittance goal of less than 100 pm·rad. The present HALF lattice is a modified hybrid six-bend-achromat (6BA) lattice with a long and a short straight section in each cell. In this paper, a 7BA lattice is designed for HALF as a promising option, which follows the main feature of hybrid 7BA lattice, but to have a compact configuration and lower emittance, all bends in this lattice are combined-function bends and reverse bends. The designed HALF storage ring has a circumference of 388.8 m and 20 identical cells. Two solutions with different betatron tunes are studied for this lattice. One with smaller tunes has better nonlinear dynamics performance allowing for off-axis injection, which has a natural emittance of 67 pm·rad. The other with larger tunes has very small beta functions at the straight section as well as lower natural emittance of 59 pm·rad, which can enhance the brightness of insertion device (ID) radiation. The intra-beam scattering effect and ID radiation properties are also presented in this paper.

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Lower Emittance Lattice for the Advanced Photon Source Upgrade Using Reverse Bending Magnets

Cited by 8 publications

References 0 publications

Design study of APS-U-type hybrid-MBA lattice for mid-energy DLSR

Design study of APS-U-type hybrid-MBA lattice for mid-energy DLSR

Design and comparison of hybrid multi-bend achromat lattices for HALF storage ring

A seven-bend-achromat lattice option for the HALF storage ring

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