| Autor: |
XU Yiming, ZHANG Junqiang, XIAO Chengcheng, FANG Wencheng |
| Jazyk: |
čínština |
| Rok vydání: |
2022 |
| Předmět: |
|
| Zdroj: |
He jishu, Vol 45, Iss 6, Pp 060102-060102 (2022) |
| Druh dokumentu: |
article |
| ISSN: |
0253-3219 |
| DOI: |
10.11889/j.0253-3219.2022.hjs.45.060102&lang=zh |
| Popis: |
BackgroundShanghai Soft X-ray Free-electron Laser (SXFEL) is upgrading and requires to operate in double-bunch mode instead of original mode to transport uniform energy along the bunch chain.PurposeThis study aims to satisfy the requirement of double-bunch mode by designing and implementing low level radio frequency (LLRF) system to flatten the output of RF pulse compressor through amplitude modulation.MethodsBased on double PI-control loops, the LLRF control system was designed and implemented with one PI-feedback loop for keeping the long-term stability of amplitude and phase, and the additional operating-outside-LLRF PI-feedback loop for flattening the output pulse shape. Furthermore, an experimental setup, including the compressor, was built for the verification of the above method.ResultsThe 2-h continuous test results show that the double PI-control loops can flatten and keep the compressor output, and maintain the long-term stability of amplitude and phase within 0.09% and 0.1° (Root Mean Square, RMS) respectively. In addition, the algorithm can restore the flat-top output automatically when a large manual frequency offset occurs.ConclusionsThe double PI-control loop applied to the LLRF system preserves satisfactory static and dynamic behaviors, meeting the requirement of the SXFEL upgrade. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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