Author: Li, W.
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MOPOW054 The 4th Harmonic Cavity for Hefei Light Source-II 837
  • C.-F. Wu, S. Dong, G. Huang, D. Jia, K. Jin, C. Li, J.Y. Li, W. Li, J.G. Wang, L. Wang, W. Xu, K. Xuan
    USTC/NSRL, Hefei, Anhui, People's Republic of China
  • R.A. Bosch
    UW-Madison/SRC, Madison, Wisconsin, USA
  • G.Y. Kurkin, E. Rotov
    BINP SB RAS, Novosibirsk, Russia
  • G. Ya
    Budker Institute of Nuclear Physics, Novosibirsk, Russia
  The 4th harmonic cavity has been firstly used in the storage ring for HLS-II. The paper presents the physics design, developing process and the experimental results for commision. The measurment results show that rf parameters are reasonable. The 4th harmonic cavity efficiently lengthen the bunch and increase the beam life-time. Specially, the beam instablity has been supressed.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-MOPOW054  
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WEPOR058 Preliminary Study for the HLS Variable Pulse Length Storage Ring by Two Harmonic Cavities 2802
SUPSS011   use link to see paper's listing under its alternate paper code  
  • T. Zhang, W. Li, L. Shang, L. Wang, C.-F. Wu
    USTC/NSRL, Hefei, Anhui, People's Republic of China
  The 4th harmonic cavity is successfully used in HLS II to increase the beam lifetime and suppress the beam instability now. At the future, a scheme of the two higher harmonic cavities may be applied in Hefei light source for a variable electron pulse length storage ring (HLS VSR). With optimal RF system parameters, 45 ps long bunches and 6 ps short bunches may be stored simultaneously in the HLS storage ring. The ratio of the bunch number for 45 ps to the one for 6 ps is 1:2. Particle tracking calculations are performed to simulate the longitudinal phase space of the new system and to track the process of shortening bunches with Elegant Software. Moreover, a tracking simulation code for RF systems is developed in MALAB to study transient beam loading which affects bunch length, phase stability, and longitudinal muti-bunch oscillation for different fill patterns. In the end, the preliminary design of the two harmonic cavities for longitudinal bunch focusing is given.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPOR058  
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WEPOW027 Initial Lattice Design for Hefei Advanced Light Source: A VUV and Soft X-ray Diffraction-limited Storage Ring 2889
  • Z.H. Bai, Q.K. Jia, W. Li, G. Liu, C.W. Luo, Q. Luo, L. Wang
    USTC/NSRL, Hefei, Anhui, People's Republic of China
  The upgrade project of Hefei Light Source was successfully completed in 2014 and has been operated for synchrotron radiation users since 2015, which is a second generation light source in the range of VUV and soft X-ray at NSRL in China. To meet the future requirements for users, more efforts are now putting at NSRL into the design of Hefei Advanced Light Source (HALS), a new VUV and soft-X ray diffraction-limited storage ring. The HALS storage ring will have an energy of 2 GeV and a natural emittance of about 50 pm·rad. This paper reports the initial lattice design studies, including linear optics design and nonlinear dynamics optimization.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPOW027  
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THPMB022 Direct and High Resolution Beta-Function Measurements for Storage Ring Lattice Characterization 3272
  • W. Li, H. Hao, Y.K. Wu
    FEL/Duke University, Durham, North Carolina, USA
  • W. Li, W. Xu
    USTC/NSRL, Hefei, Anhui, People's Republic of China
  Betatron functions are a set of commonly used merits to characterize the lattice performance of a circular accelerator. The betatron functions in many accelerators can be computed using a lattice model trained or calibrated using a set of closed orbit responses, which is exemplified by the widely used LOCO technique. However, for some accelerators, like Duke storage ring with quad-sextupole combined function magnets, LOCO cannot be employed in any straight forward manner. In this case, direct measurements for betatron function are required. One way to determine betatron functions at the location of quadrupoles for a circular accelerator is to use the relationship between the quadrupole strength variations and the corresponding betatron tune change. In this paper, we present a set of carefully developed techniques to accurately measure the betatron functions at the location of quadrupoles, which allow us to achieve extremely high accuracy. Measurement errors will be discussed, and the detailed measurement technique will be present. Finally, we'll report preliminary experimental results of beta function measurements in the Duke storage ring with statistical error on the order of 1%.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPMB022  
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