SAP2014 - List of Authors (Xia, J.W.)

Paper	Title	Page
WEPH08	Simulation of Magnet Field Disturbance Effect on the Third Order Resonant Extraction	41
	J. Li, L.J. Mao, R.S. Mao, J. Shi, M.T. Song, J.W. Xia, J.C. Yang, X.D. Yang, Y.J. Yuan, T.C. Zhao IMP, Lanzhou, People's Republic of China
	The third order resonant slow extraction experimental research has progressed at the main ring of HIRFL, but the extracted beam spill intensity is significantly modulated by some periodic disturbances which leaded to large-scale beam break during continuous extraction and hardly decreased beam emittance at external targets. The periodic beam disturbance can be attributed to the main magnet field disturbances by low-frequency ripple of magnet power supplies. The disturbance effect of quadruple and dipole magnetic fields on the extracted beam spill intensity variation and emittance are evaluated by simulation in this paper. The simulation result shows that the current quadruple field disturbance level has a strong impact on both beam spill intensity and extracted beam emittance on the main ring.

WEPH10	Heavy Ions Radiography Facility at IMP	48
	L.N. Sheng, R. Cheng, P. Li, J.W. Xia, G.Q. Xiao, J.C. Yang, Y.J. Yuan, Y.T. Zhao, X.M. Zhou IMP, Lanzhou, People's Republic of China J. Deng, X.G. Jiang, G.J. Yang, L.W. Zhang CAEP/IFP, Mainyang, Sichuan, People's Republic of China T. Wei Institute of Fluid Physics, China Academy of Engineering Physics, Mianyang, Sichuan, People's Republic of China Y. Yan Lanzhou University, Lanzhou, People's Republic of China
	In order to identify the density and material type, high energy protons, electron, and heavy ions are used to radiograph dense objects. The transmitted particles through the object undergo the multiple coulomb scattering, and focus on an image plane by a magnetic lens system. A transformed beam line in the Institute of Modern Physics (IMP) of the Chinese Academy of Sciences (CAS) has been developed for heavy ions radiography. It can radiograph a static object and the spatial resolution is about 65um (σ). This paper presents the heavy ions radiography facility at IMP, including the beam optics, the simulation of radiography by Monte Carlo code and the experiment result with 600 MeV/u carbon ions. In addition, the dedicated beam lines for proton radiography in plan are also introduced.

THPMH2	Electron Cooling Experiments at HIRFL-CSR	113
	L.J. Mao, J. Li, X.M. Ma, J.W. Xia, T.L. Yan, J.C. Yang, X.D. Yang, Y.J. Yuan IMP, Lanzhou, People's Republic of China
	Two new-generation electron coolers have been operated at main ring and experimental ring of HIRFL-CSR facility, respectively. The electron beam with a variable profile helps to get an ion beam with the emittance and intensity that meet the demands of specific physical experiments. Fast transverse cooling of the hot ion beam after horizontal multiturn of stripping injection allows beam accumulation at the injection energy. After optimization of the accumulation and cooling process an current increase by more than one order of magnitude has been achieved. Momentum spread in the 10^-4 range has been demonstrated. In this paper, the longitudinal cooling force and the transverse cooling time measurements, the intrabeam scattering effect measurements were introduced.

Paper

Title

Page

Simulation of Magnet Field Disturbance Effect on the Third Order Resonant Extraction

41

J. Li, L.J. Mao, R.S. Mao, J. Shi, M.T. Song, J.W. Xia, J.C. Yang, X.D. Yang, Y.J. Yuan, T.C. Zhao
IMP, Lanzhou, People's Republic of China

The third order resonant slow extraction experimental research has progressed at the main ring of HIRFL, but the extracted beam spill intensity is significantly modulated by some periodic disturbances which leaded to large-scale beam break during continuous extraction and hardly decreased beam emittance at external targets. The periodic beam disturbance can be attributed to the main magnet field disturbances by low-frequency ripple of magnet power supplies. The disturbance effect of quadruple and dipole magnetic fields on the extracted beam spill intensity variation and emittance are evaluated by simulation in this paper. The simulation result shows that the current quadruple field disturbance level has a strong impact on both beam spill intensity and extracted beam emittance on the main ring.

WEPH10

Heavy Ions Radiography Facility at IMP

48

L.N. Sheng, R. Cheng, P. Li, J.W. Xia, G.Q. Xiao, J.C. Yang, Y.J. Yuan, Y.T. Zhao, X.M. Zhou
IMP, Lanzhou, People's Republic of China
J. Deng, X.G. Jiang, G.J. Yang, L.W. Zhang
CAEP/IFP, Mainyang, Sichuan, People's Republic of China
T. Wei
Institute of Fluid Physics, China Academy of Engineering Physics, Mianyang, Sichuan, People's Republic of China
Y. Yan
Lanzhou University, Lanzhou, People's Republic of China

In order to identify the density and material type, high energy protons, electron, and heavy ions are used to radiograph dense objects. The transmitted particles through the object undergo the multiple coulomb scattering, and focus on an image plane by a magnetic lens system. A transformed beam line in the Institute of Modern Physics (IMP) of the Chinese Academy of Sciences (CAS) has been developed for heavy ions radiography. It can radiograph a static object and the spatial resolution is about 65um (σ). This paper presents the heavy ions radiography facility at IMP, including the beam optics, the simulation of radiography by Monte Carlo code and the experiment result with 600 MeV/u carbon ions. In addition, the dedicated beam lines for proton radiography in plan are also introduced.

THPMH2

Electron Cooling Experiments at HIRFL-CSR

113

L.J. Mao, J. Li, X.M. Ma, J.W. Xia, T.L. Yan, J.C. Yang, X.D. Yang, Y.J. Yuan
IMP, Lanzhou, People's Republic of China

Two new-generation electron coolers have been operated at main ring and experimental ring of HIRFL-CSR facility, respectively. The electron beam with a variable profile helps to get an ion beam with the emittance and intensity that meet the demands of specific physical experiments. Fast transverse cooling of the hot ion beam after horizontal multiturn of stripping injection allows beam accumulation at the injection energy. After optimization of the accumulation and cooling process an current increase by more than one order of magnitude has been achieved. Momentum spread in the 10^-4 range has been demonstrated. In this paper, the longitudinal cooling force and the transverse cooling time measurements, the intrabeam scattering effect measurements were introduced.