SAP2014 - List of Authors (Li, J.)

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.

WEPH11	Study of the Heavy Ion Bunch Compression in CSRm	51
	D.Y. Yin, W.P. Chai, J. Li, P. Li, Y. Liu, P. Shang, J.C. Yang, Y.J. Yuan IMP, Lanzhou, People's Republic of China
	The feasibility of attaining nanosecond pulse length heavy ion beam is studied in the main ring(CSRm) of the Heavy Ion Research Facility in Lanzhou. Such heavy ion beam can be produced by non-adiabatic compression, and it is implemented by a fast rotation in the longitudinal phase space. In this paper, the possible beam parameters during longitudinal bunch compression are studied with the envelope model and Particle in Cell simulation, and the results are compared. The result shows that the short bunch 238U²⁸⁺ with the pulse duration of about 50ns at the energy of 200MeV/u can be obtained

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.

WEPH11

Study of the Heavy Ion Bunch Compression in CSRm

51

D.Y. Yin, W.P. Chai, J. Li, P. Li, Y. Liu, P. Shang, J.C. Yang, Y.J. Yuan
IMP, Lanzhou, People's Republic of China

The feasibility of attaining nanosecond pulse length heavy ion beam is studied in the main ring(CSRm) of the Heavy Ion Research Facility in Lanzhou. Such heavy ion beam can be produced by non-adiabatic compression, and it is implemented by a fast rotation in the longitudinal phase space. In this paper, the possible beam parameters during longitudinal bunch compression are studied with the envelope model and Particle in Cell simulation, and the results are compared. The result shows that the short bunch 238U²⁸⁺ with the pulse duration of about 50ns at the energy of 200MeV/u can be obtained

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.