Author: Liu, G.
Paper Title Page
TUPWO063 Reducing HLS-II Emittance by Radiation Damping Partition Factor Exchange 2009
  • J.Y. Li
    FEL/Duke University, Durham, North Carolina, USA
  • W. Li, G. Liu, W. Xu
    USTC/NSRL, Hefei, Anhui, People's Republic of China
  • Y. Li
    BNL, Upton, Long Island, New York, USA
  Funding: The Introduction of Outstanding Technological Talents Program of Chinese Academy of Sciences, 2010.
In this paper, we present a preliminary study on using a Robinson wiggler, a wiggler with transverse gradient, to reduce the horizontal beam emittance of the Hefei Light Source II (HLS-II) storage ring. A proof-of-principle study demonstrates that it is possible to further reduce the horizontal beam emittance by 50\% using a 2-meter long Robinson wiggler installed on a dispersive straight section. This encouraging result suggests a feasible option to significantly improve the HLS-II performance at a relative low cost and without significant modification to its global configuration in the near future.
THPEA016 EPICS Driver for Phoenix Contact Redundant PLC 3176
  • G. Liu, C. Li, J.Y. Li, J.G. Wang, W. Xu, K. Xuan
    USTC/NSRL, Hefei, Anhui, People's Republic of China
  The RFC 460R PLC from Phoenix Contact is a high-performance controller that has been extended to offer redundancy functionality. This redundancy functionality is vital for uninterrupted processes in complex systems and large plants. In order to integrate this product into EPICS environment, an EPICS Driver is developed. This driver is intended to connect a pair of RFC 460R redundant PLCs via TCP/IP to an EPICS IOC. In this paper, the communication mechanism, software implementation and the test results of a prototype system will be described.