Author: Qin, B.
Paper Title Page
WEPVA081 Topology Optimization for a Superconducting Cyclotron Main Magnet 3446
SUSPSIK109   use link to see paper's listing under its alternate paper code  
 
  • L.G. Zhang, K. Fan, S. Hu, L.X.F. Li, Z.Y. Mei, B. Qin, Z.J. Zeng
    HUST, Wuhan, People's Republic of China
  • W. Chen
    Huazhong University of Science and Technology, State Key Laboratory of Advanced Electromagnetic Engineering and Technology,, Hubei, People's Republic of China
  
  Main magnet is the heaviest component in a superconducting cyclotron, which occupies a large amount of cost. Topology optimization method is implanted to minimize the weight of main magnet while keep the field performance, which will make significant economic benefit. Due to the powerful superconducting coils, the main magnet is driven into saturation, and the nonlinear effect of the material must be considered. If the ordinary standard density method is used for the main magnet structure optimization, the nonlinear B-H relation have to be interpolated and the sensitivity analysis is very complicated. In this paper, a proper 2D model is established and the optimization formulation is given using standard density method. Then, the optimized topology of the main magnet for a 250MeV superconducting proton cyclotron is designed.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-WEPVA081  
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THPIK070 Localization of RF Breakdown Point in a Coaxially Loaded LINAC Cavity 4254
 
  • Q.S. Chen, T. Hu, B. Qin
    HUST, Wuhan, People's Republic of China
  • Y.J. Pei
    USTC/NSRL, Hefei, Anhui, People's Republic of China
  
  Here we report how the RF breakdown point (RFBP) can be localized in a coaxially loaded linac cavity with just the forward and the reflected power signal. The cavity uses 4 load cells instead of output coupler to absorb remanent power, so no transmitted power signal could be recorded. We propose two methods to analyze the measured signals and localize the RFBP. One method focuses on the time delay of the two signals while the other one focuses on the amplitude. Quantitative analysis showed the two methods were well consistent with each other and indicated the RFBP located at the end of the linac cavity.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPIK070  
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THPVA112 Progress of the Beamline and Energy Selection System for HUST Proton Therapy Facility 4719
 
  • B. Qin, Q.S. Chen, K. Fan, M. Fan, X.Y. Fang, D. Li, Z.K. Liang, K.F. Liu, X. Liu, P. Tan, J. Yang
    HUST, Wuhan, People's Republic of China
  • W. Chen
    Huazhong University of Science and Technology, State Key Laboratory of Advanced Electromagnetic Engineering and Technology,, Hubei, People's Republic of China
  
  Funding: Work supported by The National Key Research and Development Program of China, with grant No. 2016YFC0105305
HUST proton therapy facility is a 5 years National Key Research and Development Program of China. This facil-ity is based on an isochronous superconducting cyclotron with two gantry treatment-rooms and one fixed beamline treatment station. The status for physical and technical design of the beamline and Energy Selection System (ESS) will be introduced in this paper. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPVA112  
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