Author: Zhao, H.W.
Paper Title Page
MOPM2P90
 Status and Challenges of High Intensity Heavy Ion Accelerator Facility (HIAF) in China  
 
  • J.C. Yang, J.W. Xia, G.Q. Xiao, H.S. Xu, Y.J. Yuan, H.W. Zhao, X.H. Zhou
    IMP/CAS, Lanzhou, People's Republic of China
  
  HIAF is a proposed new accelerator facility in China. The facility is being designed to provide intense primary and radioactive beams for a wide range of research fields. The HIAF facility plan was approved by central government of China in December 2015. The machine studies are now mainly focused on design optimization and key technical R&D.The unique features of the first phase of HIAF are high current pulsed beams from iLinac and high intensity heavy ion beams with ultra-short bunch length from BRing. The cooled rare isotope beams also will be prepared through projectile-fragmentation (PF) method and advanced beam cooling technology. To reach the main goals of the HIAF facility, there are still several technical challenges such as operation with high intensity beams, control of the dynamic vacuum pressure, beam compression for very short pulse beam and the design of Nuclotron-type superconducting magnets. For most of those challenges solutions have been found and prototypes are being built through close international collaborations. The general description, accelerator challenges and present status are given in the presentation.  
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TUPM8Y01
 Lessons of High-power CW Beam Commissioning of Injector II of Chinese ADS  
 
  • H. Jia, W. Chang, W.L. Chen, W.P. Dou, C. Feng, Z. Gao, Y. He, Y. Tao, W.S. Wang, Z.J. Wang, J.X. Wu, Q. Wu, Z. Xue, Y.J. Yuan, Y. Zhang, H.W. Zhao
    IMP/CAS, Lanzhou, People's Republic of China
  
  Funding: Supported by CAS Strategic Priority Research Program-Future Advanced Nuclear Fission Energy, and also by National Natural Science Foundation of China (11525523).
The Chinese ADS Injector II has commissioned CW proton beam to 4.6 MeV, 3.9 mA with superconducting linac. Lessons of high-power beam commissioning, including lattice settings, phase scan, power ramping procedure and accidents will be presented. 		 
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WEAM5Y01 Analyzing and Matching of Mixed High Intensity Highly Charged Ion Beams 422
 
  • X.H. Zhang, C. Qian, L.T. Sun, Y. Yang, X. Yin, Y.J. Yuan, H.W. Zhao
    IMP/CAS, Lanzhou, People's Republic of China
  
  Funding: Work supported by the National Natural Science Foundation of China (No. 11575265, 11427904) and the “973” Program of China (No. 2014CB845501).
Electron cyclotron resonance (ECR) ion sources are widely used in heavy ion accelerators for their advantages in producing high quality intense beams of highly charged ions. However, it exists challenges in the design of the Q/A selection systems for mixed high intensity ion beams to reach sufficient Q/A resolution while controlling the beam emittance growth. Moreover, as the emittance of beam from ECR ion sources is coupled, the matching of phase space to post accelerator, for a wide range of ion beam species with different intensities, should be carefully studied. In this paper, the simulation and experimental results of the Q/A selection system at the LECR4 platform are shown. The formation of hollow cross section heavy ion beam at the end of the Q/A selector is revealed. A reasonable interpretation has been proposed, a modified design of the Q/A selection system has been committed for HIRFL-SSC linac injector. The features of the new design including beam simulations and experiment results are also presented. 		 
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THPM2Y01
 Instability of CW RFQ With High Beam Loading  
 
  • R. Huang, Y. He, H.W. Zhao
    IMP/CAS, Lanzhou, People's Republic of China
  
  Funding: The National Natural Science Fund 91426303 and 11525523.
The frequency detuning as large as 10 kHz observed on the RFQ of the Injector II of the CIADS when the beam passed by couldn’t be explained by the beam loading theory based on the equivalent circuit analysis, which is a mainstream theory being widely used in the analysis of beam loading nowadays. By introducing the concept of beam-cavity system, together with the impedance model of the beam, the beam induced detuning of the beam-cavity system was proved to be amount to the optimum detuning of the cavity under the given beam condition in a very straightforward way and the problem was therefore converted to the calculation of the optimum detuning of the RFQ. With the introduction of the new notions of effective synchronous phase and RF phase, the existing beam loading theory is extended to the analysis of the more complex accelerating structures, such as RFQ, which has many accelerating cells and with different synchronous phase in each cell, along with more than one dominant mode coexisting in the cavity. The numerical result obtained from the extended beam loading theory was well agreed with the experiment result mentioned at the beginning. 		 
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