Author: He, Y.
Paper Title Page
MOPWO013 A New Scalable Software Package for Large Scale Beam Dynamic Simulations 912
  • R. Zhao, J. Xu
    IS, Beijing, People's Republic of China
  • Y. He, C. Li, X. Qi, L. Yang
    IMP, Lanzhou, People's Republic of China
  Large scale Beam Dynamics Simulations (BDS) are important in accelerator design and optimization. With the fast development of supercomputers, new software packages need to be developed in order to fully make use of hardware and software progresses. In this paper, we will introduce a new BDS software package, LOCUS3D, which is developed for efficient use of these new techniques. It is based on Particle-In-Cell (PIC) method, and includes space charge effect by solving the Poisson’s equation. Parallel Poisson solver has been developed with MPI. Standard accelerator devices can be simulated and new devices can be added. Benchmark results have been obtained on several different platforms, such as INSPUR cluster at RDCPS, BG/P at ANL. Large-scale simulation with 109 particles can be simulated now in the simulations. LOCUS3D will be used for more realistic accelerator simulations in the near future.  
  • S.H. Liu, Y. He, Z.J. Wang
    IMP, Lanzhou, People's Republic of China
  The China ADS(C-ADS) project undertaken by the Chinese Academy of Science is based on superconducting proton linac. The design goal is to accelerate 10mA CW proton beam up to 1.5GeV. The accelerator includes an injector section and a main superconducting linac. Two injectors are under studying by IHEP and IMP respectively. In this paper, an alternative design of the main linac with full spoke cavity base on the beam characteristics from IMP injectorⅡis described. In addition, multi-particle beam dynamics simulations have been performed using TraceWin code to estimate the space charge effect.  
TUPWA059 End-to-end Beam Simulations for the C-ADS Injector II 1838
  • X. Wu, E. Tanke, Q. Zhao
    FRIB, East Lansing, Michigan, USA
  • Y. He, H. Jia, Z.J. Wang, H.W. Zhao
    IMP, Lanzhou, People's Republic of China
  The Injector II for the proposed Chinese Accelerator Driven System (C-ADS) is designed to accelerate proton beam to ~ 10 MeV with beam current up to ~ 10 mA. The accelerator system will include a proton ECR ion source, a Low Energy Beam Transport System (LEBT), a room-temperature radio frequency quadrupole (RFQ), a Medium Energy Beam Transport System (MEBT), a Superconducting (SC) linac and a High Energy Beam Transport System (HEBT). Both RFQ and the SC linac will have a base frequency of 162.5 MHz. The accelerating cryomodules in the SC linac uses SC half-wave cavities for acceleration and SC solenoids with dipole correctors for transverse focusing and central orbit correction. End-to-end beam simulations starting with a realistic initial input beam from the ECR ion source were performed using DYNAC and IMPACT codes to evaluate the C-ADS Injector II accelerator system performance, code benchmarking with TRACK and explore system design options for future optimizations. The results of these beam dynamics studies will be presented in the paper.  
High Intensity Heavy Ion Accelerator Facility (HIAF) in China  
  • J.C. Yang, W.P. Chai, D.Q. Gao, Y. He, P. Li, L.Z. Ma, X. Ma, R.S. Mao, J. Meng, J. Shi, L.T. Sun, J.W. Xia, G.Q. Xiao, H.S. Xu, D.Y. Yin, Y.J. Yuan, W.-L. Zhan, J.Q. Zhang, H.W. Zhao, X.H. Zhou
    IMP, Lanzhou, People's Republic of China
  HIAF ( High Intensity heavy ion Accelerator Facility ) is a new facility planned at China for heavy ion related research. The accelerator complex of this facility consists of a high current superconducting linac (S-Linac), a 45 Tm multifunction synchrotron (ABR-45) equipped with electron cooling for beam accumulation and acceleration and a high energy storage ring system with three storage rings CSR-45, MCR45-1, MCR45-2. The beam from ABR-45 can be stacked longitudinally to high intensity in CSR45. MCR45-1 and MCR45-2 provied two interaction points for Ion-Ion Merging and Electron-Ion Collision researches. The key features of the facility are unprecedented pulse beam intensities and versatile operation mode. The facility will provide intense beams of primary and rare isotopes relativistic heavy ions for a wide range of experiments in particle, nuclear and atomic physics. High energetic and highly bunched heavy ion beams are used to interact with dense plasma to probe the physics of nuclear fusion. Highly charged ions are used for atomic physics programs and a series of applied science.  
slides icon Slides WEOBB103 [9.197 MB]  
THPWO047 The LLRF Measurement and Analysis of the SSC-LINAC RFQ 3875
  • G. Liu, J.E. Chen, S.L. Gao, Y.R. Lu, Z. Wang, X.Q. Yan, K. Zhu
    PKU, Beijing, People's Republic of China
  • X. Du, Y. He, G. Pan, Y.Q. Yang, X. Yin, Y.J. Yuan, Z.L. Zhang, H.W. Zhao
    IMP, Lanzhou, People's Republic of China
  Funding: Supported by NSFC(11079001)
The manufacturing process of the SSC-LINAC RFQ went to end and the LLRF measurement has been done. The frequency of the RFQ is 53.557 MHz without tuning, which is not far from the design value 53.667 MHz. The unflatness of the field along the beam axis is less than ±4%, which meets the simulation results. The dipole field is in the acceptable margin as well. The frequency will be adjusted by tuning plungers in operation. In this paper, the field distribution along the cavity has been measured and compared with the modulated electrodes simulation. The difference and its influences on the beam transmission have been analyzed.
THPWO048 A CW High Charge State Heavy Ion RFQ for SSC-LINAC 3878
  • Y.R. Lu, J.E. Chen, S.L. Gao, G. Liu, Z. Wang, X.Q. Yan, K. Zhu
    PKU, Beijing, People's Republic of China
  • Y. He, L.P. Sun, J.W. Xia, Y.Q. Yang, X. Yin, Y.J. Yuan, Z.L. Zhang, H.W. Zhao
    IMP, Lanzhou, People's Republic of China
  Funding: Supported by NSFC 11079001
To improve the super heavy ion beam injection efficiency and supply high current heavy ion beam for Separated Sector Cyclotron, A CW RFQ for heavy ion with high charge state has been designed and manufactured in the last two years. This RFQ will operate at 53.667MHz, will accelerate super heavy ions such as 238U34+ to 143keV/u. This paper will introduce the SSC-LINAC components, especially the RFQ beam dynamics, full length structure design, tuning and cooling method. Furthermore RF system and RF commissioning with full power for the RFQ power cavity will also be presented.