Beam dynamics, extreme beams, sources and beam related technologies
Control system
Paper Title Page
TUPO130 The Design of HEPS Magnet Database and Applications 591
 
  • Y.S. Qiao, F.S. Chen, C.P. Chu
    IHEP, Beijing, People’s Republic of China
 
  HEPS (High Energy Photon Source) is a planned ultra-bright and extremely low emittance synchrotron light source which will contain about 2500 magnets. The magnet related data including design, measurements, tests, and operation are typically scattered in various storages which can be hard to access for high-level purposes. For such a large number of magnets, it is very important to have essential magnet information systematically stored in relational databases for efficient management and applications. This paper outlines the conceptual and the functional design for the HEPS magnet database and its associated applications, mainly for design of the database schema and application software architecture. This database is developed with MySQL. To provide a better view and access function of magnet related data, a web-based management platform has been developed for data uploading, querying and data managing.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-TUPO130  
About • paper received ※ 10 September 2018      issue date ※ 18 January 2019  
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TUPO132 Implementation of the Beam Loading Compensation Algorithm in the LLRF System of the European XFEL 594
 
  • Ł. Butkowski, J. Branlard, M. Omet, R. Rybaniec, H. Schlarb, Ch. Schmidt
    DESY, Hamburg, Germany
 
  In the European XFEL, a maximum number of 2700 electron bunches per RF pulse with beam currents up to 4.5mA can be accelerated. Such large beam currents can cause a significant drop of the accelerating gradients, which results in large energy changes across the macro-pulse. But, the electron bunch energies should not deviate from the nominal energy to guarantee stable and reproducible generation of photon pulses for the European XFEL users. To overcome this issue, the Low Level RF system (LLRF) compensates in real-time the beam perturbation using a Beam Loading Compensation algorithm (BLC) minimizing the transient gradient variations. The algorithm takes the charge information obtained from beam diagnostic systems e.g. Beam Position Monitors (BPM) and information from the timing system. The BLC is a part of the LLRF controller implemented in the FPGA. The article presents the implementation of the algorithm in the FPGA and shows the results achieved with the BLC in the European XFEL.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-TUPO132  
About • paper received ※ 11 September 2018      issue date ※ 18 January 2019  
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