| Paper | Title | Page |
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MOPB009 |
Harmonic cavity dynamics studies: efficient methods and new type of Robinson instabilities | |
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| In order to cope with the intrabeam scattering effect induced emittance growth, the Touschek scattering effect induced beam lifetime limitation and the beam-impedance coupling effect induced instability growth, harmonic cavities are used to stretch the bunch and provide Landau damping, which has become a necessary choice for modern advanced synchrotron light sources. However, harmonic cavities operated in bunch lengthening mode can cause some adverse effects such as beam loading, Robinson instability, etc., which possibly pose a limitation on the maximum bunch lengthening. This paper will report on our research progress on harmonic cavity dynamics associated with efficient methods for bunch lengthening calculation and new type of Robinson instabilities. | ||
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| MOPB017 | Analysis of the Fluctuation of Resonance Driving Terms for Nonlinear Lattice Optimization | 41 |
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| Minimizing resonance driving terms (RDTs) of nonlinear magnets is a traditional approach to enlarge the dynamic aperture (DA) of a storage ring. The local cancellation of nonlinear dynamics, which is adopted by some diffraction-limited storage rings, is more effective than the global cancellation. The former has smaller fluctuation of RDTs along the ring. In this paper, the correlation between two kinds of RDT fluctuations is found. The qualitative analysis shows that minimizing the RDT fluctuations is beneficial for controlling the crossing terms and thus enlarging the DA. This qualitative analysis is supported by the statistical analysis of nonlinear solutions of a double-bend achromat lattice. | ||
| DOI • | reference for this paper ※ doi:10.18429/JACoW-SAP2023-MOPB017 | |
| About • | Received ※ 10 July 2023 — Accepted ※ 11 July 2023 — Issued ※ 11 April 2024 | |
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WEAA01 |
Status of the Hefei Advanced Light Facility (HALF) Project | |
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| Electron beam emittance of storage rings can be reduced to very small values by using muti-bend achromat (MBA) lattice, for this reason, fourth-generation of storage ring light sources are emerging to push beyond the brightness and coherence reached by third-generation light sources. Hefei Advanced Light Facility (HALF) project was put forward a few years ago as a fourth-generation light source with soft X-ray diffraction-limited storage ring operated at 2.2 GeV. A 2.2 GeV linear accelerator will be used as a full-energy injector for the storage ring. The ring with circumference of 480 m employs an MBA lattice to achieve a bare lattice emittance of 85 pm·rad. The engineering implementation of the MBA lattice ring raises several technological issues, for example, high field gradient magnet, low-conductance vacuum chamber with small aperture and with non-evaporable getter (NEG) coating, high beam injection efficiency with small dynamic aperture, etc. For responding to these challenges, a preliminary research and development project of HALF was completed at the end of 2020. Some details of HALF conceptual design, key technologies and plans are presented. | ||
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