| Paper | Title | Page |
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TUPB030 |
Preliminary study of the fringe field effects and cross talk between magnets in the HEPS storage ring | |
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| The High Energy Photon Source (HEPS) is a 6 GeV, 1.3 km storage ring light source being built in Beijing, China. To get an ultralow emittance, high-gradient quadrupoles, combined-function magnets and longitudinal gradient dipoles are adopted in the design of the storage ring and the lattice is compact. The fringe field effects and cross talk between magnets may result in performance distortion of the machine, the impacts of these effects are worth studying. To this end, several methods based on one-dimensional and three-dimensional magnetic fields are used to model different kinds of magnets of the HEPS storage ring and the cross talk between magnets are simulated and evaluated. In this paper, we will introduce detailed modeling methods and the impact of fringe field effects and cross talk on the linear optics of the HEPS storage ring. | ||
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WEXA01 |
A new framework for high level application development at HEPS | |
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| As a fourth-generation light source, HEPS employs a compact multi-bend achromat dispersion structure and uses a large number of combination magnets, which brings new challenges to beam parameter control. In order to meet the beam commissioning requirements of HEPS, a new high level application (HLA) development framework was designed and named Pyapas. The new framework adopts a model-based control strategy, a double-layer physical model module is designed for online calculation, which can address complex physical parameter tuning issues. To facilitate physicists in beam commissioning and research, the new framework is designed based on physical quantities,, which can be more intuitive in the commissioning process for measuring parameter analysis. And Pyapas also uses modular design to reduce development time. In March, 2023, HEPS began beam commissioning work of Linac. With the help of the HLAs based on physical quantities, we quickly found the appropriate working mode and achieved full-line beam pass-through. The report will detail the design concept and features of Pyapas. | ||
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