Author: Leng, Y.B.
Paper Title Page
MOP006
 Design Overview of the Electron Storage Ring Instrumentation System for Hefei Advanced Light Factory  
 
  • B.G. Sun, Y.B. Leng, Y. Liang, P. Lu, Q. Luo, L.L. Tang, A.X. Wang, J. Wang, T.Y. Zhou, Z.R. Zhou
    USTC/NSRL, Hefei, Anhui, People’s Republic of China
  
  The Hefei Advanced Light Factory (HALF) is a diffraction-limited storage ring with a beam energy of 2.2 GeV. Based on the beam related technical parameters and requirements provided by the physical design of the HALF storage ring, the storage ring beam instrumentation system mainly includes beam position measurement system, DC current measurement system, bunch-by-bunch beam current measurement system, tune measurement system, beam profile measurement system, bunch length measurement system, bunch-by-bunch feedback system, fast orbit feedback system, BPM displacement measurement system, and beam loss measurement. An overview of the design of the storage ring instrumentation system will be presented.  
Cite • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)  
 
TUP018
 Longitudinal Parameter Measurement System Based on Time-Frequency Domain Joint Analysis  
 
  • HS. Wang, Y.M. Zhou
    SSRF, Shanghai, People’s Republic of China
  • Y.B. Leng
    USTC/NSRL, Hefei, Anhui, People’s Republic of China
  • X. Yang
    UCAS, Beijing, People’s Republic of China
  
  This paper proposes a novel technique for measuring longitudinal bunch length by performing spectral analysis on the beam signals to extract the bunch length information for each bunch and each turn. A high-speed oscilloscope is used to capture original button signal with more than 7000 turns information and an offline Python script is used to retrieve bunch length and phase information. A streak camera is used to calibrate the transfer function of the acquisition system. Experiments were carried out at the Shanghai Synchrotron Radiation Facility and the Hefei Light Source by capturing the electrode signals with an oscilloscope during single bunch injection and harmonic cavity tuning in the storage ring. The calibrated longitudinal bunch length measurement system yielded favorable results, with a larger dynamic range and higher time resolution compared to the streak camera. In the future, the system has the potential to be transplanted into a processor to achieve online longitudinal beam measurement for each bunch.  
poster icon Poster TUP018 [0.568 MB]  
Cite • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)  
 
WEP038
 Development of the Prototype for Measuring Beam Position and Orbit Tilt Based on Cavity BPM for the SHINE  
 
  • J. Chen, F.Z. Chen
    SSRF, Shanghai, People’s Republic of China
  • S.S. Cao
    SARI-CAS, Pudong, Shanghai, People’s Republic of China
  • Y.B. Leng
    USTC/NSRL, Hefei, Anhui, People’s Republic of China
  
  In recent decades, the high-gain free-electron lasers (FELs) based on linear accelerator has been successfully developed around the world. Advanced beam diagnostics and feedback technology is one of the key factors to further improve the performance of such facilities. Both the beam position deviation and orbit tilt will weaken the interaction between electron beam and photon beam in the undulator, and affected the FEL radiation performance severely. According to the physical requirements of the SHINE, this paper proposes a method based on the measurement results of a single cavity BPM, which can simultaneously achieve the in-suit measurement of beam position deviation and orbit tilt, thus opening up a new way to improve the efficiency of FEL radiation. The working principle, the development of the verification prototype and the preliminary beam experiments will also be presented in this paper. Under the bunch charge of 100 pC, the beam experiment results show that the prototype has a resolution of better than 13.3¿rad for the beam orbit tilt measurement, which can be applied to the SHINE after optimization.  
Cite • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)  
 
WEP039
 Operation Performance Evaluation of Accelerator Based on Cluster Analysis of Bunch-by-Bunch Diagnostic Data  
 
  • X. Yang
    SINAP, Shanghai, People’s Republic of China
  • Y.B. Leng
    USTC/NSRL, Hefei, Anhui, People’s Republic of China
  • Y.M. Zhou
    SARI-CAS, Pudong, Shanghai, People’s Republic of China
  
  In order to improve the operating performance of the particle accelerator, it is better to develop a toolkits to monitor and analyze the sub-health state of the facility in addition to ensuring the stability of basic parameters such as beam current, life, transverse size, longitudinal length and orbit. The 3D bunch-by-bunch position measurement system combined with cluster analysis is a feasible solution for this requirement. HOTCAP is a general solution, which is based on high-speed oscilloscope and developed by SSRF, can deliver charge and absolute 3D position information bunch-by-bunch. Clustering analysis is a method for multidimensional data with complex structure. The data can be aggregated and discover the dependencies between data items. After the SSRF bunch-by-bunch measurement system is put into operation, the data of injection and steady-state operation are continuously accumulated. From it, many information including 3D positions, 3D tunes, filling pattern, refilled charge and the 3D damping times can be extracted. In this paper, based on the operational data of SSRF and the cluster analysis, operational status of the storage ring and injector is evaluated.  
poster icon Poster WEP039 [0.502 MB]  
Cite • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)