Author: He, Y.
Paper Title Page
WEA1I01
 Progress and CW Beam Commissioning of China ADS  
 
  • Y. He
    IMP/CAS, Lanzhou, People's Republic of China
  
  Funding: Strategic Technology Pilot Project of the Chinese Academy of Sciences: Advanced Nuclear Fusion Energy - ADS Transmutation System
China Accelerator Driven System (ADS) project was proposed by CAS. It includes a superconducting proton linac, a tungsten granular spallation target, and a subcritical reactor with liquid lead-bismuth coolant, and started in 2011. The project China Initiative Accelerator Driven Sub-critical System (CIADS) is approved, consists of 250 MeV linac and 10 MWt sub-critical reactor. It will be constructed in 2022. The road map and progress are introduced in the presentation. A 25 MeV Demo Linac is developing at IMP and the first 25 MeV beam will be in Sept. 2016. It consists of 35 keV ECRIS, 162.5 MHz four-vane RFQ, and four cryomodules. The first three are installed with six half wave resonators and the last one is installed with six spoke resonators. To verify integral technology and commissioning of high power CW beam, a single-cavity cryomodule was developed and commissioned with ~11 mA proton beam in advance in Feb. 2015. Now, the first cryomodule with 5 MeV CW beam is commissioning, some results are presented. The progress of a 325 MHz front-end is also introduced. 		 
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WEA1C01
 High Power Beam Commissioning Issues for the Prototype of China ADS Injector at IMP  
 
  • Z.J. Wang, Y. He, H. Jia, S.H. Liu
    IMP/CAS, Lanzhou, People's Republic of China
  
  China ADS project is lunched in 2011 by CAS (Chinese Academy Science), which aims to solve the nuclear waste disposition problem. The Injector as a demonstrated facility composed by RFQ cavity, superconducting cavities has been installed on-line and commissioned from June 2014. Proton beam has been accelerated to 5 MeV at CW operation mode successfully. More than 25kW proton beam has been operated stable for one hour, which is the highest record among the same type linacs. In this paper, the commissioning issues and results for high beam power superconducting linac will be presented in detail.  
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WEPB06 Optimization Design of the RFQ Trapezoidal Electrode 203
 
  • C.X. Li, Y. He, Z.J. Wang
    IMP/CAS, Lanzhou, People's Republic of China
  
  In order to reduce the length of a deuteron beam RFQ, trapezoidal modulation is used in the last 3-meter-long section. Because there is no existing tested design procedure fitting for designing this type of unconventional structure, a VBA code used for designing trapezoidal modulation RFQ electrode was developed. VBA is an effective and efficient tool for completing repetitive work. So it can be used to design repetitive analogous cells of electrode of RFQ or DTL or other periodic acceleration structures. By using this VBA code, cell length and the exit energy can be obtained accurately. The feasibility and accuracy of this method have been validated by beam dynamics simulation.  
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WEPB15 The Cost Optimization Studies of the Superconducting Linac 225
 
  • Y. Tao, W.L. Chen, C. Feng, Y. He, H. Jia, P. Jiang, S.H. Liu, W.S. Wang, Z.J. Wang
    IMP/CAS, Lanzhou, People's Republic of China
  
  *High power superconducting linac develops fast recently with the strong demand from research and application. The cost and scale of the projects increase with the energy and beam power. For the superconducting linac, the choice of beta family is the key point to determine the effective acceleration efficiency of the whole facility. The Particle swarm optimization algorithm (PSO) is proposed to optimize the TTF value of the cavities to increase the acceleration efficiency. The project cost considering main hardware price is the final objective to evaluate the choice of beta family. The C-ADS lianc is used as an example to demonstrate the application of the new method. The optimization process and results are presented in the paper.  
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WEPB16 Conceptual Design of LEBT for C-ADS Linac Accelerator 228
 
  • W.L. Chen, Y. He, H. Jia, Y. Tao, Z.J. Wang, Q. Wu
    IMP/CAS, Lanzhou, People's Republic of China
  
  *In order to avoid the hybrid ions like H2+, H3+ injecting into the RFQ and the residual gas H2 tracing through the RFQ which may lead the RFQ cavity performance degradation, we present the conceptual design of the Low Energy Beam Transport (LEBT) for the China Accelerator Driven Sub-Critical reactor system (C-ADS) accelerator. The LEBT, consisting of one bending magnet and three solenoids and four short-drift sections, match the CW proton beam with 35KeV and 10mA to the entrance of a radio frequency quadrupole (RFQ). This bending LEBT can easily separate the unwanted ions. With the edge angles and one quadrupole to correct the beam asymmetry causing by the bending magnet, the simulation results meet the RFQ entrance requirements.  
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