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Qin, Q.

   
Paper Title Page
TUC3H101 Optimization Of The BEPCII Lattice With Frequency Map Analysis 100
 
  • Y. Jiao, S. X. Fang, Q. Qin, Wang, J. Q. Wang, G. Xu, D. M. Zhou
    IHEP Beijing, Beijing
  
  It is the first time of systemically applying the frequency map analysis (FMA) onto the lattice of BEPCII, which is an e±e? collider. We compute various parameters of the lattice with AT which the FMA code is imbedded in, and compared with that of MAD and SAD codes. The BEPCII colliding and injecting mode lattice are analyzed and optimized with FMA while turning the RF cavity and radiation on. Both on- and off-momentum frequency maps are overviewed. The transverse-longitudinal coupling resonance is found to be able to have large effects on the beam dynamics.  
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WEXMA02 The BEPCII: Construction and Initial Commissioning 285
 
  • C. Zhang, Q. Qin
    IHEP Beijing, Beijing
  
  As a natural extension of the Beijing Electron-Positron Collider (BEPC), the BEPCII project has started its construction since the beginning of 2004. The BEPCII will operate in beam energy of 1-2.1 GeV, its design luminosity is 1*1033cm-2s-1 at 1.89 GeV with double-ring structure. The upgraded collider will also serve as a synchrotron radiation source with higher beam energy and intensity than the BEPC. Some key technologies, such as superconducting RF system, low impedance vacuum devices, superconducting micro-beta quadrupoles, etc. are developed. The injector linac reached its design specification by the summer of 2006. Most storage ring components have been manufactured, installed and tested. The final checkout of the storage ring subsystems is underway. For the delay of the cryogenic and high current test of the superconducting quadrupoles, the commissioning of the storage rings will be started with normal magnets in the interaction region in autumn of 2006. The project is scheduled to complete in 2008. This paper will present the updated status and preliminary commissioning results of the BEPCII.

* For the BEPCII team

 
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WEZMA02 China Spallation Neutron Source Design 310
 
  • J. Wei
    BNL, Upton, Long Island, New York
  • S. X. Fang, S. Fu, H. F. Ouyang, Q. Qin, H. Qu, J. Tang, S. Wang, X. Xu
    IHEP Beijing, Beijing
  • J. Feng, Q. W. Yan, J. Zhang, Z. Zhang
    IPHY, Beijing
  • F. W. Wang
    Institute of Physics, Chinese Academy of Sciences, Beijing
  
  The China Spallation Neutron Source (CSNS) is a newly approved project to be constructed in Guangdong, China. The accelerator complex consists of an H- linear accelerator and a rapid cycling synchrotron accelerating the beam to 1.6 GeV at 25 Hz repetition rate. The primary challenge is to build a robust and reliable user’s facility with upgrade potential at a fraction of “world standard” cost. During the past years, major iterations were made on the design of CSNS accelerator systems. This paper summarizes the machine design and discusses rationale of design revisions.  
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WEPMA037 Beam Coupling Impedance Studies of the CSNS Ring 372
 
  • N. Wang, Q. Qin
    IHEP Beijing, Beijing
  
  The China Spallation Neutron Source (CSNS) is a high intensity proton accelerator with an injection energy of 80 MeV. The knowledge of impedance in the vacuum chamber is necessary for optimizing the accelerator performance. In this paper, the longitudinal and transverse coupling impedances of the CSNS Rapid Cycling Synchrotron (RCS) are estimated.