Author: Li, C.
Paper Title Page
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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WEPOR003 Voltage Control for the 4-Th Harmonic Cavity in Hls Storage Ring 2664
 
  • K. Xuan, C. Li, J.Y. Li, G. Liu, W. Xu
    USTC/NSRL, Hefei, Anhui, People's Republic of China
 
  In order to increase the beam lifetime, a 4th harmonic RF cavity was installed in the HLS-II storage ring. The electrical fields in the principle cavity and high harmonic cavity stretch the beam in the longitudinal direction, and increase the beam volume in phase space, leading to a longer Touschek lifetime. Stable electrical voltage in the high harmonic cavity is essential for steady beam stretching and better beam lifetime. To get a stable high voltage in the high harmonic cavity, we develop a method to maintain steady resonance condition in the cavity using a PID scheme. This paper presents the details of this method. The feedback result is also reported.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPOR003  
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THPOY005 Virtual Accelerator System for Online and Offline Simulations 4094
 
  • S. Ma, C. Li, G. Liu, J.G. Wang, W. Xu, K. Xuan
    USTC/NSRL, Hefei, Anhui, People's Republic of China
 
  Synchrotron radiation light sources have been becoming import scientific tools in various research areas. To build a state-of-the-art synchrotron radiation light source, one need to carefully study the linear and nonlinear dynamics of the charged beam in each of the light source components, such as the linac, transfer line, booster synchrotron and storage ring. There are many mature software tools, including MAD, elegant and Accelerator toolkit (AT), can be used to accomplish these tasks. In order to achieve a high performance light source, up-to-date technologies are adopt to build various subsystems. The integration of these subsystems need to be fully tested before the light source is operated. However, there lacks of a good software to perform this work. The virtual light source (VLS), a software based upon EPICS and AT, is developed at the National Synchrotron Radiation Laboratory (NSRL) to fulfill this purpose. This paper presents the details of this software. Some critical applications are also illustrated.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPOY005  
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