Lattice design for the CEPC double ring scheme

Wang, Yiwei; Su, Feng; Bai, Sha; Zhang, Yuan; Bian, Tianjian; Wang, Dou; Chen, Yu; Gao, Jie

doi:10.1142/s0217751x18400018

Cited by 9 publications

(3 citation statements)

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“…This mitigates the side effect of Higher Order Mode (HOM). The optics is carefully optimized for all energies based on which the high luminosities are expected [4]. The design of the interaction region provides local chromaticity and the crab-waist collision is implemented [5].…”

Section: Cepc Designmentioning

confidence: 99%

CEPC accelerator status overview

Li,

Gao

2024

J. Inst.

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In 2012, the Higgs boson was successfully observed at the LHC. Due to the relatively low mass of the Higgs, it is possible to build a Higgs factory using a circular e+e- collider. Consequently, the Circular Electron-Positron Collider (CEPC) was proposed shortly after the observation of the Higgs. After several years of pre-studies, the CEPC study group completed the Conceptual Design Report (CDR) in 2018. Since then, a series of key technology R&D efforts have been carried out, and the accelerator design has been continuously optimized. The accelerator design can meet the scientific objectives by allowing operation at different energies for Higgs/W/Z, and ttbar, with high luminosities. Key technologies required for mass production have been developed, including the high-performance superconducting accelerating cavities and modules, high-efficiency RF power sources, magnets, and vacuum systems, etc,. This paper will present the selected key technology R&D accomplishments and updated accelerator key parameters.

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Section: Cepc Designmentioning

confidence: 99%

CEPC accelerator status overview

Li,

Gao

2024

J. Inst.

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“…(10) shows that the values of K 1 and K 2 affect the adjustment. Note that θ u < 0, hence the value of K 1 must be negative to avoid synchrotron radiation from the upstream bending magnets hitting the IP [34]. And K 2 must not be negative.…”

Section: Insertion Schemesmentioning

confidence: 99%

Investigation of spin rotators in CEPC at Z-pole

Xia¹,

Duan²,

Gao³

et al. 2022

Preprint

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Longitudinal polarization is an important design aspect of the future 100 km-scale Circular Electron Position Collider (CEPC). Spin rotators are needed in CEPC collider rings to make the beam polarization along the longitudinal direction at the interaction points (IPs). This paper focuses on the design of spin rotators for CEPC at Z-pole (45.6 GeV). Methods: The design of spin rotators in CEPC at Z-pole is based on solenoid magnets and horizontal bending magnets sections. The coupling of transverse motion introduced by solenoids is compensated with quadrupole lenses. Adjustments have been made to the layout to implement the spin rotators into the collider rings. Results: Longitudinal polarized beam can be achieved at the IPs with the spin rotators. High degree of polarization is attainable, while the effect of spin rotators on orbital motion is acceptable. The detailed simulation results will be presented. Conclusion: A solenoid-based spin rotator configuration is designed and integrated into the CEPC collider ring lattice. According to the simulation results, the polarization requirements can be satisfied.

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“…Then the second sextupole cancels geometrical aberrations caused by the first sextupole and the nonlinear dynamics induced by a pair of sextupoles will be eliminated by each other. As a result, there is no visible effect of their behavior outside the −𝐼 transformation [10][11][12], which is beneficial to nonlinear beam dynamic optimization. The explicit phase constraint combining with very low betatron function at IP and nanoscale emittance cause that the interaction region to be one of the most difficult region for lattice design.…”

Section: Interaction Regionmentioning

confidence: 99%

Design of beam optics for a Super Tau-Charm Factory

Lan¹,

Luo²,

Zhang³

et al. 2021

J. Inst.

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Beam optics design for a Super Tau-Charm Factory (STCF) that planning in China is presented in this paper. This STCF is an electron-positron circular collider characterized with high luminosity, wide energy ranges as well as high longitudinally polarized electron beam. In order to achieve high luminosity, the recently proposed collision scheme based on large Piwinski angle and crab waist sextupole will be adopted. In this paper, the beam optical parameters and their design basis for the STCF storage ring lattice are given. In addition, the preliminary dynamic aperture and beam-beam simulation are studied to get a luminosity more than 0.5 × 1035 cm-2 s-1 at the optimized energy 2 GeV.

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Lattice design for the CEPC double ring scheme

Cited by 9 publications

References 0 publications

CEPC accelerator status overview

CEPC accelerator status overview

Investigation of spin rotators in CEPC at Z-pole

Design of beam optics for a Super Tau-Charm Factory

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