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Zhang, H.

Paper Title Page
RPAE077 A Magnetic Field Model for the Undulator in HLS 3994
 
  • H. Zhang, L. Wang
    USTC/NSRL, Hefei, Anhui
  • Y.L. Li
    DESY, Hamburg
 
  It is important to understand the influence of wigglers and undulators on the beam dynamics in design and optimization of a storage ring, especially when the storage ring runs on a low emittance mode. We present an analytic model of the undulator field in HLS, which can be used in the tracking study to evaluate the effects of it. Coefficients needed by the model are generated by fitting to the results of a numerical field caculation. Fringe fields are included in this model. Then we use three different methods to track particles through the undulator, and compare the results.  
RPPT049 Linear Optics Compensation of the Superconducting Wiggler in HLS 3037
 
  • L. Wang, G. Feng, W. Li, H. Xu, H. Zhang
    USTC/NSRL, Hefei, Anhui
 
  Hefei Light Source is a dedicated VUV light source. A superconducting wiggler magnet with 6 Tesla magnetic field was installed on the storage ring to generate hard X-ray radiation. With the compensation of tune shift due to insertion device, beam was successfully stored, but the beam lifetime was decreased much. In order to cure the lifetime, a simple hard-edge model of the wiggler was constructed in lattice simulation code and the compensation scheme was extensively studied again. Calculation showed that it is difficulty to localize the strong focusing effects from wiggler magnet. Then, a new scheme was brought forward and experimental result showed that it can restore the beam lifetime largely. As the application of LOCO method in HLS, a new compensation scheme was calculated by response matrix fitting, and the experimental result also presented in this paper.