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Sun, B.

Paper Title Page
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.  
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.

 
TUPMN058 The Operation Status of HLS (Hefei Light Source) 1058
 
  • W. Li, G. Feng, L. Liu, B. Sun, J. H. Wang, L. Wang, H. Xu, K. Xuan
    USTC/NSRL, Hefei, Anhui
  • S. C. Zhang
    USTC, Hefei, Anhui
  
  National Synchrotron Radiation Lab, University of Science and Technology of China, P. R.China HLS(Hefei Light Source) is a dedicated synchrotron radiation research facility, spectrally strongest in Vacuum Ultra Violet and Soft X-ray. Designed and constructed in 1980's, accepted to regular service in 1991. From 1999 to 2004, the National Synchrotron Radiation Lab carried out its Phase II Project, in which quite a few sub-systems of HLS storage ring were upgraded and 8 new beamline were constructed. After the project, the performance of HLS is improved considerably. In this paper, the operation status and performance of storage ring in recent years were presented. With some measures, the operation beam intensity is about 300mA, beam lifetime is higher than before, orbit stability is met requirement of users, and the capability to provide synchrotron radiation exceeds the design value.  
FRPMN051 Design of S-band Cavity BPM for HLS 4102
 
  • Q. Luo, H. He, P. Li, P. Lu, B. Sun, J. H. Wang
    USTC/NSRL, Hefei, Anhui
  
  Funding: Supported by 985 Project of USTC 173123200402002

For the development of accelerators we require increasingly precise control of beam position. Cavity BPMs promise a much higher position resolution compared to other BPM types and manufacture of cavity BPMs is in general less complicated. The cavity BPM operating at S-band for HLS (Hefei Light Source) was designed. It consists of two cavities: a position cavity tuned to TM110 mode and a reference cavity tuned to TM010 mode. To suppress the monopole modes we use waveguides as pickups. Superheterodyne receivers are used in electronics for many cavity BPMs while we decide to use chip AD8302 produced by Analog Devices to process the signals. To simulate and calculate the electromagnetic field we use MAFIA.

 
FRPMN052 Bunch Length Measurement in Time Domain for HLS 4108
 
  • B. Y. Wang, P. Lu, B. Sun, J. Wang, J. H. Wang, H. Xu
    USTC/NSRL, Hefei, Anhui
  
  Funding: Supported by the Natural Science Foundation of China (10675118) and by Knowledge Innovation Project of CAS

A simple measurement method of beam bunch length in time domain for HLS (Hefei Light Source) has been proposed. The Bunch length measurement system is composed of an optical system, a high speed photo-receiver and a wide bandwidth oscilloscope. The photo-receiver which is made by FEMTO has high sensitivity and high bandwidth, which converts the synchrotron radiation light into electronic signal. The oscilloscope which is made by Tektronix is TDS7704B, which has a high bandwidth up to 7GHz and show the bunch length in time domain. The measurement results of the bunch length and its analysis are given. We compare the results with that determined by the conventional method using a streak camera.