IPAC2013 - List of Authors (He, Y.)

Paper

Title

Page

A New Scalable Software Package for Large Scale Beam Dynamic Simulations

912

R. Zhao, J. Xu
IS, Beijing, People's Republic of China
Y. He, C. Li, X. Qi, L. Yang
IMP, Lanzhou, People's Republic of China

Large scale Beam Dynamics Simulations (BDS) are important in accelerator design and optimization. With the fast development of supercomputers, new software packages need to be developed in order to fully make use of hardware and software progresses. In this paper, we will introduce a new BDS software package, LOCUS3D, which is developed for efficient use of these new techniques. It is based on Particle-In-Cell (PIC) method, and includes space charge effect by solving the Poisson’s equation. Parallel Poisson solver has been developed with MPI. Standard accelerator devices can be simulated and new devices can be added. Benchmark results have been obtained on several different platforms, such as INSPUR cluster at RDCPS, BG/P at ANL. Large-scale simulation with 10⁹ particles can be simulated now in the simulations. LOCUS3D will be used for more realistic accelerator simulations in the near future.

TUPWA025

DESIGN STUDIES OF THE C-ADS MAIN LINAC WITH ONLY SPOKE CAVITIES

1781

S.H. Liu, Y. He, Z.J. Wang
IMP, Lanzhou, People's Republic of China

The China ADS(C-ADS) project undertaken by the Chinese Academy of Science is based on superconducting proton linac. The design goal is to accelerate 10mA CW proton beam up to 1.5GeV. The accelerator includes an injector section and a main superconducting linac. Two injectors are under studying by IHEP and IMP respectively. In this paper, an alternative design of the main linac with full spoke cavity base on the beam characteristics from IMP injectorⅡis described. In addition, multi-particle beam dynamics simulations have been performed using TraceWin code to estimate the space charge effect.

TUPWA059

End-to-end Beam Simulations for the C-ADS Injector II

1838

X. Wu, E. Tanke, Q. Zhao
FRIB, East Lansing, Michigan, USA
Y. He, H. Jia, Z.J. Wang, H.W. Zhao
IMP, Lanzhou, People's Republic of China

The Injector II for the proposed Chinese Accelerator Driven System (C-ADS) is designed to accelerate proton beam to ~ 10 MeV with beam current up to ~ 10 mA. The accelerator system will include a proton ECR ion source, a Low Energy Beam Transport System (LEBT), a room-temperature radio frequency quadrupole (RFQ), a Medium Energy Beam Transport System (MEBT), a Superconducting (SC) linac and a High Energy Beam Transport System (HEBT). Both RFQ and the SC linac will have a base frequency of 162.5 MHz. The accelerating cryomodules in the SC linac uses SC half-wave cavities for acceleration and SC solenoids with dipole correctors for transverse focusing and central orbit correction. End-to-end beam simulations starting with a realistic initial input beam from the ECR ion source were performed using DYNAC and IMPACT codes to evaluate the C-ADS Injector II accelerator system performance, code benchmarking with TRACK and explore system design options for future optimizations. The results of these beam dynamics studies will be presented in the paper.

WEOBB103

High Intensity Heavy Ion Accelerator Facility (HIAF) in China

J.C. Yang, W.P. Chai, D.Q. Gao, Y. He, P. Li, L.Z. Ma, X. Ma, R.S. Mao, J. Meng, J. Shi, L.T. Sun, J.W. Xia, G.Q. Xiao, H.S. Xu, D.Y. Yin, Y.J. Yuan, W.-L. Zhan, J.Q. Zhang, H.W. Zhao, X.H. Zhou
IMP, Lanzhou, People's Republic of China

HIAF ( High Intensity heavy ion Accelerator Facility ) is a new facility planned at China for heavy ion related research. The accelerator complex of this facility consists of a high current superconducting linac (S-Linac), a 45 Tm multifunction synchrotron (ABR-45) equipped with electron cooling for beam accumulation and acceleration and a high energy storage ring system with three storage rings CSR-45, MCR45-1, MCR45-2. The beam from ABR-45 can be stacked longitudinally to high intensity in CSR45. MCR45-1 and MCR45-2 provied two interaction points for Ion-Ion Merging and Electron-Ion Collision researches. The key features of the facility are unprecedented pulse beam intensities and versatile operation mode. The facility will provide intense beams of primary and rare isotopes relativistic heavy ions for a wide range of experiments in particle, nuclear and atomic physics. High energetic and highly bunched heavy ion beams are used to interact with dense plasma to probe the physics of nuclear fusion. Highly charged ions are used for atomic physics programs and a series of applied science.

Slides WEOBB103 [9.197 MB]

THPWO047

The LLRF Measurement and Analysis of the SSC-LINAC RFQ

3875

G. Liu, J.E. Chen, S.L. Gao, Y.R. Lu, Z. Wang, X.Q. Yan, K. Zhu
PKU, Beijing, People's Republic of China
X. Du, Y. He, G. Pan, Y.Q. Yang, X. Yin, Y.J. Yuan, Z.L. Zhang, H.W. Zhao
IMP, Lanzhou, People's Republic of China

Funding: Supported by NSFC(11079001)
The manufacturing process of the SSC-LINAC RFQ went to end and the LLRF measurement has been done. The frequency of the RFQ is 53.557 MHz without tuning, which is not far from the design value 53.667 MHz. The unflatness of the field along the beam axis is less than ±4%, which meets the simulation results. The dipole field is in the acceptable margin as well. The frequency will be adjusted by tuning plungers in operation. In this paper, the field distribution along the cavity has been measured and compared with the modulated electrodes simulation. The difference and its influences on the beam transmission have been analyzed.

THPWO048

A CW High Charge State Heavy Ion RFQ for SSC-LINAC

3878

Y.R. Lu, J.E. Chen, S.L. Gao, G. Liu, Z. Wang, X.Q. Yan, K. Zhu
PKU, Beijing, People's Republic of China
Y. He, L.P. Sun, J.W. Xia, Y.Q. Yang, X. Yin, Y.J. Yuan, Z.L. Zhang, H.W. Zhao
IMP, Lanzhou, People's Republic of China

Funding: Supported by NSFC 11079001
To improve the super heavy ion beam injection efficiency and supply high current heavy ion beam for Separated Sector Cyclotron, A CW RFQ for heavy ion with high charge state has been designed and manufactured in the last two years. This RFQ will operate at 53.667MHz, will accelerate super heavy ions such as 238U³⁴⁺ to 143keV/u. This paper will introduce the SSC-LINAC components, especially the RFQ beam dynamics, full length structure design, tuning and cooling method. Furthermore RF system and RF commissioning with full power for the RFQ power cavity will also be presented.

Paper	Title	Page
MOPWO013	A New Scalable Software Package for Large Scale Beam Dynamic Simulations	912
	R. Zhao, J. Xu IS, Beijing, People's Republic of China Y. He, C. Li, X. Qi, L. Yang IMP, Lanzhou, People's Republic of China
	Large scale Beam Dynamics Simulations (BDS) are important in accelerator design and optimization. With the fast development of supercomputers, new software packages need to be developed in order to fully make use of hardware and software progresses. In this paper, we will introduce a new BDS software package, LOCUS3D, which is developed for efficient use of these new techniques. It is based on Particle-In-Cell (PIC) method, and includes space charge effect by solving the Poisson’s equation. Parallel Poisson solver has been developed with MPI. Standard accelerator devices can be simulated and new devices can be added. Benchmark results have been obtained on several different platforms, such as INSPUR cluster at RDCPS, BG/P at ANL. Large-scale simulation with 10⁹ particles can be simulated now in the simulations. LOCUS3D will be used for more realistic accelerator simulations in the near future.

TUPWA025	DESIGN STUDIES OF THE C-ADS MAIN LINAC WITH ONLY SPOKE CAVITIES	1781
	S.H. Liu, Y. He, Z.J. Wang IMP, Lanzhou, People's Republic of China
	The China ADS(C-ADS) project undertaken by the Chinese Academy of Science is based on superconducting proton linac. The design goal is to accelerate 10mA CW proton beam up to 1.5GeV. The accelerator includes an injector section and a main superconducting linac. Two injectors are under studying by IHEP and IMP respectively. In this paper, an alternative design of the main linac with full spoke cavity base on the beam characteristics from IMP injectorⅡis described. In addition, multi-particle beam dynamics simulations have been performed using TraceWin code to estimate the space charge effect.

TUPWA059	End-to-end Beam Simulations for the C-ADS Injector II	1838
	X. Wu, E. Tanke, Q. Zhao FRIB, East Lansing, Michigan, USA Y. He, H. Jia, Z.J. Wang, H.W. Zhao IMP, Lanzhou, People's Republic of China
	The Injector II for the proposed Chinese Accelerator Driven System (C-ADS) is designed to accelerate proton beam to ~ 10 MeV with beam current up to ~ 10 mA. The accelerator system will include a proton ECR ion source, a Low Energy Beam Transport System (LEBT), a room-temperature radio frequency quadrupole (RFQ), a Medium Energy Beam Transport System (MEBT), a Superconducting (SC) linac and a High Energy Beam Transport System (HEBT). Both RFQ and the SC linac will have a base frequency of 162.5 MHz. The accelerating cryomodules in the SC linac uses SC half-wave cavities for acceleration and SC solenoids with dipole correctors for transverse focusing and central orbit correction. End-to-end beam simulations starting with a realistic initial input beam from the ECR ion source were performed using DYNAC and IMPACT codes to evaluate the C-ADS Injector II accelerator system performance, code benchmarking with TRACK and explore system design options for future optimizations. The results of these beam dynamics studies will be presented in the paper.

WEOBB103	High Intensity Heavy Ion Accelerator Facility (HIAF) in China
	J.C. Yang, W.P. Chai, D.Q. Gao, Y. He, P. Li, L.Z. Ma, X. Ma, R.S. Mao, J. Meng, J. Shi, L.T. Sun, J.W. Xia, G.Q. Xiao, H.S. Xu, D.Y. Yin, Y.J. Yuan, W.-L. Zhan, J.Q. Zhang, H.W. Zhao, X.H. Zhou IMP, Lanzhou, People's Republic of China
	HIAF ( High Intensity heavy ion Accelerator Facility ) is a new facility planned at China for heavy ion related research. The accelerator complex of this facility consists of a high current superconducting linac (S-Linac), a 45 Tm multifunction synchrotron (ABR-45) equipped with electron cooling for beam accumulation and acceleration and a high energy storage ring system with three storage rings CSR-45, MCR45-1, MCR45-2. The beam from ABR-45 can be stacked longitudinally to high intensity in CSR45. MCR45-1 and MCR45-2 provied two interaction points for Ion-Ion Merging and Electron-Ion Collision researches. The key features of the facility are unprecedented pulse beam intensities and versatile operation mode. The facility will provide intense beams of primary and rare isotopes relativistic heavy ions for a wide range of experiments in particle, nuclear and atomic physics. High energetic and highly bunched heavy ion beams are used to interact with dense plasma to probe the physics of nuclear fusion. Highly charged ions are used for atomic physics programs and a series of applied science.
	Slides WEOBB103 [9.197 MB]

THPWO047	The LLRF Measurement and Analysis of the SSC-LINAC RFQ	3875
	G. Liu, J.E. Chen, S.L. Gao, Y.R. Lu, Z. Wang, X.Q. Yan, K. Zhu PKU, Beijing, People's Republic of China X. Du, Y. He, G. Pan, Y.Q. Yang, X. Yin, Y.J. Yuan, Z.L. Zhang, H.W. Zhao IMP, Lanzhou, People's Republic of China
	Funding: Supported by NSFC(11079001) The manufacturing process of the SSC-LINAC RFQ went to end and the LLRF measurement has been done. The frequency of the RFQ is 53.557 MHz without tuning, which is not far from the design value 53.667 MHz. The unflatness of the field along the beam axis is less than ±4%, which meets the simulation results. The dipole field is in the acceptable margin as well. The frequency will be adjusted by tuning plungers in operation. In this paper, the field distribution along the cavity has been measured and compared with the modulated electrodes simulation. The difference and its influences on the beam transmission have been analyzed.

THPWO048	A CW High Charge State Heavy Ion RFQ for SSC-LINAC	3878
	Y.R. Lu, J.E. Chen, S.L. Gao, G. Liu, Z. Wang, X.Q. Yan, K. Zhu PKU, Beijing, People's Republic of China Y. He, L.P. Sun, J.W. Xia, Y.Q. Yang, X. Yin, Y.J. Yuan, Z.L. Zhang, H.W. Zhao IMP, Lanzhou, People's Republic of China
	Funding: Supported by NSFC 11079001 To improve the super heavy ion beam injection efficiency and supply high current heavy ion beam for Separated Sector Cyclotron, A CW RFQ for heavy ion with high charge state has been designed and manufactured in the last two years. This RFQ will operate at 53.667MHz, will accelerate super heavy ions such as 238U³⁴⁺ to 143keV/u. This paper will introduce the SSC-LINAC components, especially the RFQ beam dynamics, full length structure design, tuning and cooling method. Furthermore RF system and RF commissioning with full power for the RFQ power cavity will also be presented.