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Zheng, K.

Paper Title Page
MOPAN054 Beam Instabilities Measurement and Cures at HLS 272
  • Y. L. Yang, Y. B. Chen, L. J. Huang, W. Li, L. Liu, B. Sun, J. H. Wang, K. Zheng, Z. R. Zhou
    USTC/NSRL, Hefei, Anhui
  In Hefei Light Source (HLS), coupled-bunch instabilities are major limiting factors in achieving higher beam intensity while maintaining good beam quality. To Measure and suppress beam instabilities, turn-by-turn (TBT) measurement and bunch-by-bunch(BxB) measurement & feedback system are under commission [1][2]. The design of the two systems and primary experiment results is presented. Measurement and detail analysing results in injection status will also be shown.  
MOPAN055 Bunch-by-Bunch Measurement and Feedback System of HLS 275
  • K. Zheng, Y. B. Chen, L. J. Huang, W. Li, L. Liu, B. Sun, J. H. Wang, L. Wang, Y. L. Yang, Z. R. Zhou
    USTC/NSRL, Hefei, Anhui
  Funding: Supported by National Natural Science Project (10175063); National Natural Science Key Project (10535040)

In this paper, HLS (Hefei light Source) bunch-by-bunch measurement and feedback system will be introduced. This system is integrated with longitudinal oscillation measurement system, fast vector control, fiber notch filter and bunch current detection system. The detail of the two fronts will be shown. Some experimental results by this system are also present in this paper, as phase-space tracing, mode dumping rate, and feedback experiments.

MOPAN056 Development of Digital Transverse Bunch-by-Bunch Feedback System of HLS 278
  • Z. R. Zhou, Y. B. Chen, L. J. Huang, B. Sun, J. H. Wang, Y. L. Yang, K. Zheng
    USTC/NSRL, Hefei, Anhui
  • K. Kobayashi, T. Nakamura
    JASRI/SPring-8, Hyogo-ken
  Funding: Supported by "National 211 Project"

To promote the transverse feedback system of HLS, we develop the transverse digital feedback system. The scheme of HLS digital feedback system is presented in this paper, and the primitive digital feedback experiment we have done in HLS is also included in the paper.

MOPAN053 Development of Transverse Feedback System and Instabilities Suppress at HLS 269
  • J. H. Wang, Y. B. Chen, L. J. Huang, W. Li, L. Liu, B. Sun, L. Wang, Y. L. Yang, K. Zheng, Z. R. Zhou
    USTC/NSRL, Hefei, Anhui
  • J. Cao, L. Ma, J. Yue
    IHEP Beijing, Beijing
  • D. K. Liu, K. R. Ye
    SINAP, Shanghai
  In order to cure and damp coupled bunch (CB) instabilities, a transverse bunch-by-bunch feedback system is under commission at Hefei Light Source (HLS). In this paper, we introduce the HLS Bunch-by-Bunch measurement system and transverse feedback system. The experiment result in HLS ring is also presented in this paper.  
FRPMS046 Optical-Fiber NOTCH Filter for Storage Ring Transverse Feedback System 4075
  • Y. Yin, X. Che
    Y. Y. Labs, Inc., Fremont, California
  • J. H. Wang, K. Zheng
    USTC/NSRL, Hefei, Anhui
  An optical-fiber two-tap FIR filter has been developed for storage ring transverse feedback system. The optical FIR filter has advantage of low loss which is not related to the size of the storage ring, and high-frequency response, compact in size. Measurements have been done with storage ring beam signal. The paper will present the principle and the experimental results.