Author: Fu, S.
Paper Title Page
TUPWA020 The Implementation of Equipartitioning in the Proton Linac Code PADSC 1766
  • Y.L. Zhao, S. Fu, Z. Li
    IHEP, Beijing, People's Republic of China
  The high intensity accelerator projects place extremely stringent requirements on particle loss, since even very small losses can lead to unacceptably high levels of radioactivity that can hinder or prevent hands-on maintenance. Such losses are known to be associated with emittance growth and beam halo. Non-equipartitioning contributes a lot for emittance growth and beam halo. The present equipartitioning realization has assumed that the emittance and space charge force are keeping constant, which will induce errors. The implementation in the proton linac code PADSC does equipartitioning optimization according to the real space charge force and emittance in the quasi period lattice.  
THPFI025 Design and Experimental Results of an Electro-static Pre-chopper for CSNS LEBT 3351
  • H.C. Liu, S. Fu, K.Y. Gong, H.F. Ouyang, J. Peng
    IHEP, Beijing, People's Republic of China
  The China Spallation Neutron Source (CSNS) front end incorporates a pre-chopper in the Low Energy Beam Transport line (LEBT) that will remove a 530ns section of beam at approximately 1MHz rate, which is the RF frequency of the ring at injection. It’s one of the most critical devices for properly controlling the injecting beam loss. Physical designing of the pre-chopper is carried out, and the RFQ itself was used as the beam dump of the chopper system. In order to examine the reliability of the pre-chopper design, the beam study of a similar chopper system was successfully performed. Results of physical design and experiments will be presented.  
THPWO042 Macroparticle Simulation Studies of a Beam-core Matching Experiment 3860
  • H. Jiang, P. Chen, S. Fu, T. Huang, F. Li, P. Li, H.C. Liu, C. Meng, M. Meng, Z.C. Mu, H.F. Ouyang, J. Peng, L.Y. Rong, B. Sun, J.M. Tian, B. Wang, S.C. Wang, W.Q. Xin, T.G. Xu, L. Zeng, F.X. Zhao
    IHEP, Beijing, People's Republic of China
  We compared the 3-D nonlinear macro- particle code IMPACT simulations with the measured beam-core profiles obtained by the wire-scanners in the beam-core matching experiment. Quadrupole scans were used to determinate the transverse properties of the RFQ output beam. The Gaussian distribution was chosen as the initial particle distribution, which is well fit with the measured beam-core profile. We matched the beam using the least-squares fitting procedure that adjusted the first four matching quadrupoles to produce equal rms beam size in the last six wire scanners. Simulations had been fairly successful in reproducing the core of the measured matched beam profiles.  
THPWO045 Commissioning Plan for the CSNS Linac 3869
  • J. Peng, S. Fu, J. Li, Y. Li, H.C. Liu, H.F. Ouyang, N. Wang, S. Wang, T.G. Xu
    IHEP, Beijing, People's Republic of China
  The linac of the China Spallation Neutron Source(CSNS) will be commissioned from October 2013. The linac will be commissioned in three phases. The delivery of beam to the RCS is planned for October 2015. This paper describes the commissioning plans for the MEBT and DTL parts of the linac. Techniques for finding the RF set-point, matching and steering are presented, as well as codes to assist in the beam commissioning.  
THPWO046 The Preparation for the Commissioning of CSNS Accelerators 3872
  • S. Wang, S. Fu, H.F. Ouyang, J. Peng
    IHEP, Beijing, People's Republic of China
  The China Spallation Neutron Source (CSNS) is now under construction, and the beam commissioning of ion source will start from the end of 2013, and will last several years for whole accelerators. The commissioning plan for the CSNS accelerators will be presented, including the commissioning correlated parameters, beam instrumentation in used commissioning, the goal at different commissioning stages. The development of high level application software will also be presented.  
FRXAB201 Status of CSNS Project 3995
  • S. Fu, H. Chen, Y.W. Chen, H. Dong, S.X. Fang, K.X. Huang, W. Kang, J. Li, H.C. Liu, L. Ma, H.F. Ouyang, H. Qu, H. Sun, J.Y. Tang, C.H. Wang, Q.B. Wang, S. Wang, T.G. Xu, Z.X. Xu, C. Zhang, J. Zhang
    IHEP, Beijing, People's Republic of China
  The China Spallation Neutron Source (CSNS) accelerator is designed to accelerate proton beam pulses to 1.6 GeV at 25 Hz repetition rate, striking a solid metal target to produce spallation neutrons. The accelerator provides a beam power of 100 kW on the target in the first phase and then 500 kW in the second phase by increasing the average beam intensity 5 times while raising the linac output energy. The project construction has been formally launched in 2011 and it is planed to complete the project in March 2018. It is one of the high intensity proton accelerator projects in the world and it imposes a great challenge to Chinese accelerator community. This presentation will cover the status and challenges of the CSNS project.  
slides icon Slides FRXAB201 [4.320 MB]