Author: Ouyang, H.F.
Paper Title Page
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.  
 
THPWO040 Progress of Injector-1 and Main Linac of Chinese ADS Proton Accelerator 3854
 
  • Y.L. Chi, J. Cao, J.P. Dai, H. Dong, L. Dong, T.M. Huang, X. Jing, S.P. Li, Z. Li, Z.Q. Li, Z.C. Liu, F. Long, Z. Ma, H.F. Ouyang, W.M. Pan, Q.L. Peng, P. Su, Y.F. Sui, J.Y. Tang, J.L. Wang, Q.B. Wang, Q. Ye, Z.S. Zhou
    IHEP, Beijing, People's Republic of China
 
  China ADS study program was Supported by the "Strategic Priority Research Program " of the Chinese Academy of Sciences at 2011, which aims to design and build an ADS demonstration facility with the capability of more than 1000 MW thermal power in about twenty years. The driver Linac is defined to be1.5 GeV in energy, 10mA in current and in CW operation mode. To meet the extremely high reliability and availability of ADS, the Linac is designed with much installed margin and fault tolerance. ADS accelerator is composed of two parallel 10MeV injectors and a main Linac. The superconducting acceleration structures are employed except the RFQs. This paper will present design of the China ADS accelerator and related key technology developments.  
 
THPWO041 The development of a high power input coupler for China ADS injector I RFQ 3857
 
  • T.M. Huang, X. Chen, R. Guo, H.Y. Lin, Q. Ma, F. Meng, H.F. Ouyang, W.M. Pan, X.H. Peng, Z. Zhang, G.Y. Zhao
    IHEP, Beijing, People's Republic of China
 
  A 325 MHz RFQ is designed to accelerate a beam current of 15 mA in CW mode with injection energy of 35 keV and output energy of 3.2 MeV for China Accelerator Driven sub-critical System (ADS) injector I. Total RF power of 320 kW has to be delivered into the RFQ cavity. For reliable operation, four input couplers are adopted to share the driven power. A coaxial loop type input coupler is developed. The coupler features a Tristan type RF window, a doorknob to realize the transition from a half-height WR2300 waveguide to a coaxial line and a coaxial line with a coupling antenna loop. Two prototypes of the window and inner conductor assemblies have been fabricated and received high power test. The prototypes were tested up to 100 kW CW RF power in traveling wave mode. This paper will describe the design, fabrication and high power test of the coupler in details.  
 
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.  
 
THPWO043 Progress on the Physics Design of the C-ADS Injector Scheme I 3863
 
  • Z. Li, P. Cheng, H. Geng, C. Meng, H.F. Ouyang, B. Sun, J.Y. Tang, F. Yan, Z. Yang
    IHEP, Beijing, People's Republic of China
 
  Funding: Surported by China ADS Project
The China ADS (C-ADS) driver linac is composed of two parallel 10 MeV injectors and a main linac which boosts the beam further to 1.5 MeV. There are two design schemes for the injectors based on different working frequency and superconducting cavity structures and are under developing at the same time on IHEP and IMP. The Injector Scheme I, which is proposed by IHEP, works at 325 MHz, the same frequency of the main linac, and superconducting Spoke cavities with geometry beta of 0.12, the same type of cavity as the main linac too, are applied after the RFQ. In this paper, the latest progress on physics design will be presented.
 
 
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]