Author: Sun, L.P.
Paper Title Page
TUPO005 Initial Beam Commissioning of LEAF at IMP 332
 
  • Y. Yang, W.P. Dou, X. Fang, Y.H. Guo, H. Jia, L. Jing, X.J. Liu, L. Lu, W. Lu, W. Ma, L.T. Sun, L.P. Sun, W. Wei, H.W. Zhao, Y.H. Zhai
    IMP/CAS, Lanzhou, People’s Republic of China
 
  A Low Energy intense-highly-charged ion Accelerator Facility (LEAF), which mainly includes an ECR ion source, LEBT and an 81.25 MHz RFQ, was designed to produce and accelerate heavy ions, from helium to uranium with A/Q between 2 and 7, to the energy of 0.5 MeV/u. The typical beam intensity is designed up to 2 emA CW for the uranium beam. The facility has been successfully commissioned with He+ (A/Q=4) and N2+ (A/Q=7) beams and accelerated the beams in the CW regime to the designed energy of 0.5 MeV/u. Beam properties and transmission efficiencies were measured, indicating a good consistency with simulated data. After having briefly recalled the project scope and parameters, this paper describes the beam commissioning strategy and detailed commissioning results.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-TUPO005  
About • paper received ※ 11 September 2018      issue date ※ 18 January 2019  
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THPO026 The Multi-physics Analysis of Dual-beam Drift Tube Linac 735
 
  • T. He, L. Lu, W. Ma, L.P. Sun, C.C. Xing, X.B. Xu, L. Yang
    IMP/CAS, Lanzhou, People’s Republic of China
 
  The DB-DTL prototype is proposed to validate the fea-sibility of multi-beam accelerator in middle energy region. The main parameters are listed in Table.1. The DB-DTL will operate as pulse injector with the capacity of accelerating proton from 0.56 MeV to 2.5 MeV. The 35.83 kW normalized power dissipation of DB-DTL dis-sipated on the cavity internal surface will heat the cavity and cause cavity temperature rise and structural defor-mation, which will lead to resonant frequency shifting. The cooling water takes away the power to resolve this problem. In this paper, detailed multi-physics field simu-lation of DB-DTL is performed by using ANSYS multi-physics, which is a coupled electromagnetic, thermal and structural analysis.  
poster icon Poster THPO026 [0.759 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-THPO026  
About • paper received ※ 11 September 2018      issue date ※ 18 January 2019  
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THPO050 Research on the New Cavity Structure of RFQ Accelerator With Bent Vanes at IMP 802
THOP03   use link to see paper's listing under its alternate paper code  
 
  • L. Yang, T. He, Y. He, C.X. Li, L. Lu, L.P. Sun, C.C. Xing
    IMP/CAS, Lanzhou, People’s Republic of China
  • L. Yang
    University of Chinese Academy of Sciences, Beijing, People’s Republic of China
 
  A new cavity structure of RFQ accelerator with bent vanes is proposed to meet the miniaturization requirement of low frequency heavy ion accelerators at Institute of Modern Physics (IMP), Chinese Academy of Sciences. The new structure has a downsized cross section by bending vanes while keeping a certain vane lengths. It also possesses the advantages of simple cooling structure and high power efficient when used in low frequency. The new structure has obvious advantages in reducing manufacturing difficulty of cavity, cutting down project cost, enhancing facility reliability and stability.  
slides icon Slides THPO050 [1.407 MB]  
poster icon Poster THPO050 [0.398 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-THPO050  
About • paper received ※ 12 September 2018      issue date ※ 18 January 2019  
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THPO051 The Multi-physics Analysis of LEAF RFQ 805
 
  • X.B. Xu, T. He, Y. He, C.X. Li, L. Lu, W. Ma, A. Shi, L.B. Shi, L.P. Sun, C.C. Xing, L. Yang, H.W. Zhao
    IMP/CAS, Lanzhou, People’s Republic of China
 
  The 81.25 MHz CW RFQ is designed to accelerate heavy ions with Q/A from 1/7 to 1/2 at 0.5 MeV/u for the Low Energy Accelerator Facility (LEAF) at the Institute of Modern Physics (IMP) of the Chinese Academy of Science (CAS). The four-vane RFQ consists of six mod-ules with a total length of 5.95 meters, For the CW oper-ating mode, thermal management will be a very important issue, Therefore a multi-physics analysis is necessary to ensure that the cavity can stably operate at the high RF power . The multi-physics analysis process includes RF electromagnetic analysis, thermal analysis, mechanical analysis, and the frequency shift, the cooling water system is used for frequency tunning by the temperature adjustment, and also analyze RFQ undercuts, fixed tuners, and pi-mode rods, the results show that the thermal and structural design of this RFQ is reasonable.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-THPO051  
About • paper received ※ 17 September 2018      issue date ※ 18 January 2019  
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THPO052 High Power Test of the LEAF-RFQ 808
 
  • L. Lu, Y. He, W. Ma, L.B. Shi, L.T. Sun, L.P. Sun, L. Yang, Y. Yang, H.W. Zhao
    IMP/CAS, Lanzhou, People’s Republic of China
 
  High power heavy ion drivers require a CW low-frequency accelerator for initial acceleration. A CW four-vane radio frequency quadrupole (RFQ) accelerator is designed to accelerate heavy ions A/q up to 7 from 14 keV/u to 500 keV/u, as a new injector for the Low Energy Accelerator Facility (LEAF) at Institute of Modern Physics (IMP). The measurements of low power test were reported previously. In this paper, the results of high power test of the RFQ, including the test of the acceleration systems and beam profiles, will be presented.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-THPO052  
About • paper received ※ 07 September 2018      issue date ※ 18 January 2019  
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THPO053 Status of the China Material Irradiation Facility RFQ 811
 
  • C.X. Li, W.L. Chen, W.P. Dou, Z. Gao, Y. He, G. Huang, C.L. Li, L. Lu, W. Ma, A. Shi, L.B. Shi, L.P. Sun, F.F. Wang, W.B. Wang, Z.J. Wang, Q. Wu, X.B. Xu, L. Yang, P.Y. Yu, B. Zhang, J.H. Zhang, P. Zhang, T.M. Zhu
    IMP/CAS, Lanzhou, People’s Republic of China
 
  Funding: Supported by the National Magnetic Confinement Fusion Science Program of China (Grant No.2014GB104001) and the National Natural Science Foundation of China (Grant No.91426303).
The pulsed high power test and beam test of the China Material Irradiation Facility RFQ have been implemented. Before this, the radio frequency measurements and tuning are performed. In this paper, the processes and results of the radio frequency measurements, tuning, pulsed high power test and beam test will be presented. The results of tests are in good agreement with the design.
 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-THPO053  
About • paper received ※ 12 September 2018      issue date ※ 18 January 2019  
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THPO090 The Analysis of Module Failure in High Solid-state Amplifier for High Current RFQ 886
 
  • L.P. Sun, Y. He, G. Huang, C.X. Li, L. Lu, A. Shi, L.B. Shi, X.B. Xu, H.W. Zhao
    IMP/CAS, Lanzhou, People’s Republic of China
 
  New accelerator RF system was upgraded to the solid-state amplifier in ADS project due to its stable, sustainable and reliable. Until now, newest 80kW SSA was adopted in IMP, operating in 162.5MHz, and over 120 power modules were combined through several synthesizers for 80kW output. but since too many modules were optimized for amplitude and phase in the same time, one or some failure of circulator will lead to injure of whole RF system, when wavelength meets a specific condition, injure would turn out severe accident and heavy loss. In this paper, analyzing and simulating the multi-level synthetic matrix was the important method for ADS accident happened in June 20. 2017, the failure simulated results for RF amplify links under the specific circumstances also was presented simultaneously.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-THPO090  
About • paper received ※ 17 September 2018      issue date ※ 18 January 2019  
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