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Fu, S.

Paper Title Page
MOP053 Construction of a High-Current RFQ for ADS Study 165
 
  • S. Fu, S. X. Fang, K. Y. Gong, J. Li, H. F. Ouyang, J. M. Qiao, T. G. Xu, W. W. Xu, X. A. Xu, Y. Yao, H. S. Zhang, Z. H. Zhang
    IHEP Beijing, Beijing
  • X. L. Guan
    CIAE, Beijing
  
  A high current RFQ accelerator has been constructed in China for the basic study of Accelerator Driven Subcritical System. The ADS project is supported by a national program and aimed at the development of clean nuclear energy to meet of the rapid growth of the nuclear power plants in China. The 3.5MeV RFQ accelerator has been fabricated and installed. Field tuning and high power conditioning indicate a good agreement with our design. The beam commissioning with an ECR ion source is under development. This paper will present the recent progress in the construction and commissioning of the RFQ accelerator.  
TU2003 China Spallation Neutron Source Linac Design 222
 
  • S. Fu, S. X. Fang
    IHEP Beijing, Beijing
  • J. Wei
    BNL, Upton, Long Island, New York
  
  Beijing Spallation Neutron Source has been approved in principle by the Chinese government. BSNS can provide a beam power of 100kW on the target in the first phase, and then 200kW in the second phase. The accelerator complex of BSNS consists of an H- linac of 81MeV and a rapid cycling synchrotron of 1.6GeV at 25Hz repetition rate. In the second phase, the linac energy will be upgraded to 134MeV and the average current will be doubled. The linac has been designed, and some R&D studies have been lunched under the support from Chinese Academy of Sciences. The linac comprises a H- ion source, an RFQ and a conventional DTL with EMQs. This paper will present our major design results and some progresses in the R&D of the linac.  
TU2004 Results on the Beam Commissioning of the Superconducting-RFQ of the New LNL Injector 227
 
  • A. Pisent, G. Bisoffi, D. Carlucci, M. Cavenago, M. Comunian, A. Facco, E. Fagotti, A. Galatà, A. Palmieri, M. Poggi, A. M. Porcellato, P. A. Posocco, C. Roncolato
    INFN/LNL, Legnaro, Padova
  • S. X. Fang, S. Fu
    IHEP Beijing, Beijing
  • X. L. Guan
    CIAE, Beijing
  • S. Vitulli
    CNAO Foundation, Milan
  
  A new injector for the heavy ion superconducting linac ALPI has been built at LNL. This new accelerator, named PIAVE, is designed to accelerate ions with A/Q=<8.5 up to 1.2 MeV/u. The main components are an ECRIS source operating on a high voltage platform, a three harmonic buncher, a superconducting RFQ cryomodule containing two bulk niobium structures and two QWR cryomodules housing 4 cavities each. In the last year the injector has been commissioned, with O, Ar, Ne and Xe beams, and put into operation. The beam performances, and the results of longitudinal and transverse emittance measurements will be shown and compared with simulations. Neon and argon beams have been delivered to the experiments (after acceleration with PIAVE and ALPI) for a total of about 400 hours. It should be noted that this is the first superconducting RFQ in operation; the design opportunities offered by this technology for a wider field of applications will be briefly discussed. The heart of these opportunity is given by the high intervane voltage in a cw RFQ (PIAVE can operate cw with an intervane voltage higher than 250 kV).  
TUP069 Design of 132MeV DTL for CSNS 412
 
  • J. Peng, S. Fu, Z. Sun
    IHEP Beijing, Beijing
  
  A description is given to the drift-tube-linac (DTL) of the Beijing Spallation Neutron Source (BSNS). The DTL accelerate a 3MeV, 30mA H- beam from the RFQ to the LRBT. Tank body and drift tube configuration design using the SUPERFISH code has enabled efficient optimization of the effective shunt impedance and avoided high surface field. Accelerating cells design and particle tracking were made by using PARMILA code. Special emphasis is given to the transverse focusing system design, which was compared with two usual schemes, constant phase focusing and equipartitioning focusing. Details of beam dynamics analysis will be presented in this paper.  
THP035 Design on Accelerating Tube of High-Power Electron Linac for Irradiation Processing 652
 
  • H. Liu, X. Wang
    CIAE, Beijing
  • S. Fu
    IHEP Beijing, Beijing
  
  There is an unstable phenomenon for high-power electron linacs for irradiation processing. The main source of the instability of this type of linac comes from the thermal effect of the accelerator tube under an intense heat load. If a lot of injected electrons are lost in the tube, they can cause an intense and uneven heat load on the tube that may deform the cavities of the accelerator tube and deviate the correct acceleration phase relationship. In this paper, a constant gradient accelerating structure is chosen to accelerate the electron beam, and the designed phase velocity is gradually increased along the tube. By adjusting the size of the accelerating cavities and the phase velocity function, a high capture-efficiency is reached. After a series of simulations studies, we obtained a 90% capture-efficiency, which minimizes the probability of the unstable phenomenon in the high power electron linac.  
THP070 Study of BSNS RFQ Design 746
 
  • H. F. Ouyang, S. Fu
    IHEP Beijing, Beijing
  
  A new 324MHz RFQ used for the project of Beijing Spallation Neutron Source (BSNS) is being designed. The designed injection and output energy are 50keV, 3.0MeV, respectively. The designed pulsed current is 40mA though the required current of BSNS at its first stage is only 20mA. The pulsed width is 420 s with a 50% chopping ratio and repetition rate is 25Hz. The transverse structure of BSNS RFQ will be basically the same as the former RFQ used for ADS, but the length of 3.62m is shorter comparing to the length of 4.75m of the former. The beam dynamics design and the RF structure design of the RFQ will be presented in this paper.