| Paper | Title | Page |
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MOBA04 |
Design and Beam Commissioning of the HEPS Linac | |
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| The High Energy Photon Source (HEPS) is the first fourth-generation synchrotron radiation source based on a 6-GeV diffraction-limited storage ring that is currently under construction in China. Its accelerator complex is composed of a 6-GeV storage ring, a full energy booster, a 500-MeV Linac, and three transfer lines. The Linac is an S-band normal conducting electron linear accelerator with available bunch charge up to approximately 7 nC. This is the highest bunch charge among linear (pre-)injectors of the third and fourth generation light sources worldwide. Recently we completed the commissioning of the Linac. In this talk, we will introduce the design and technical highlights of the HEPS Linac, and present the latest results of beam commissioning. | ||
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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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TUPB034 |
Step-by-step fast orbit feedback simulation in synchrotron light source | |
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Funding: Supported by the High Energy Photon Source project and the National Natural Science Foundation of China (No. 12205315). In this paper we present a step-by-step numerical simulation of fast orbit feedback (FOFB) system in synchrotron light source. Dynamic models in each stage are modelled based on measurement results or reasonable assumptions. With the simulation, we can estimate the performance of the FOFB system, as well as the effect of the element errors and orbit response matrix errors. The influence of the singulars used in the inverse response matrix can also be investigated. |
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WEAA03 |
Machine learning application studies in lattice design and optimization of 4th generation synchrotron radiation light source | |
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| For the 4th generation synchrotron radiation light source, it is required to reach ultralow emittance in the lattice design, while keeping satisfactory nonlinear performance. In the design stage of a low-emittance storage ring, the beam dynamics can be very complicated and cause great challenges to optimization, due to strong chromaticity compensation sextupoles used in the storage ring. In this talk, we report several machine learning (ML) applications that speed up the design and optimization process of a ultralow emittance storage ring. Two representative works will be introduced. We developed a neural network-based genetic algorithm that can significant improve the convergence rate and diversity among solutions compared to conventional genetic algorithms, and we trained a ML model to learn the correlations between the short-term tracking results and the long-term motion stability of particles travelling in the ring, which can reduce the computing cost of the dynamic aperture by at least an order of magnitude. | ||
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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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