SAP2017 - List of Authors (Li, J.)

Paper	Title	Page
MOPH16	RF Excitation Parameters in Resonant Extraction	59
	J. Li, Y.J. Yuan IMP/CAS, Lanzhou, People's Republic of China
	Ion beam resonant slow extraction from synchrotron is extensively used in experimental nuclear and particle physics, material radiation science, and deep-seated malignant tumours radiotherapy. In this paper, the ion motion of resonant extraction under RF excitation are discussed. The expression of sweeping frequency waveforms used in tracking code of resonant extraction of are presented.
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MOPH17	Simulation of Beam Intensity Limitations under Space Charge Effects at BRing of HIAF	63
	J. Li, J.C. Yang IMP/CAS, Lanzhou, People's Republic of China
	The booster ring (BRing) of the new approved High Intensity heavy-ion Accelerator Facility (HIAF) in China is designed to stack ²³⁸U³⁵⁺ ions at the injection energy of 17MeV/u and deliver 1.0*10¹¹ of uranium ions at 800MeV/u. Two injection modes, with or without the electron cooling, are introduced. The transverse emittance evolution and beam lifetime are investigated by simulation of RF capture process for the fast cycle mode.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-SAP2017-MOPH17
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MOPH18	Investigation on the Suppression of Intrabeam Scattering in the High Intensity Heavy Ion Beam with the Help of Double-bunch of Electron	67
	X.D. Yang, G.H. Li, J. Li, X.M. Ma, L.J. Mao, M.T. Tang, T.L. Yan, H. Zhao IMP/CAS, Lanzhou, People's Republic of China
	Intrabeam scattering is the main reason of degradation of the beam brightness and shortening of brightness lifetime in the collider, light source and storage ring. Electron cooling was chose to suppress the effect of intrabeam scattering, another unexpected effect happened during the cooling. The distribution of ion beam quickly deviates from the initial Gaussian type, form a denser core and long tail. The ions standing in the tail of beam will loss soon due to large amplitude. This solution will focus on the investigation on the suppression of intrabeam scattering in the high intensity heavy ion beam in the storage ring with the help of longitudinally modulated electron beam. The stronger cooling was expected in the tail of ion beam and the weaker cooling was performed in the tail of ion beam. The particle in the outside will experience stronger cooling and will be driven back into the centre of ion beam. The ion loss will be decreased and the lifetime will be increased. The intensity of ion beam in the storage ring will be kept and maintain for long time.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-SAP2017-MOPH18
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MOPH20	Simulation of Electron Cooling on Bunched Ion Beam	70
	H. Zhao, J. Li, L.J. Mao, M.T. Tang, J.C. Yang, X.D. Yang IMP/CAS, Lanzhou, People's Republic of China
	A combination of electron cooling and RF system is an effective method to compress the beam bunch length in storage rings. A simulation code based on multi-particle tracking was developed to calculate the bunched ion beam cooling process, in which the electron cooling, IntraBeam Scattering (IBS), ion beam space charge field, transverse and synchrotron motion are considered. In the paper, the cooling process was simulated for C beam in HIRFL-CSRm, and the result was compared with experiments, according to which the dependence of the minimum bunch length on beam and machine parameters was studied in the paper.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-SAP2017-MOPH20
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TUPH10	Electron Cooling of Bunched Ion Beam in Storage Ring	150
	L.J. Mao, J. Li, X.M. Ma, M.T. Tang, J.C. Yang, X.D. Yang, H. Zhao IMP/CAS, Lanzhou, People's Republic of China
	Funding: This work is supported by the National Natural Science Foundation of China (Project No.11575264, No.11375245 and No.11475235) and the Hundred Talents Project of the Chinese Academy of Sciences. A combination of electron cooling and RF system is an effective method to compress the beam bunch length in storage rings. A simulation code based on multi-particle tracking was developed to calculate the bunched ion beam cooling process, in which the electron cooling, Intra-Beam Scattering (IBS), ion beam space charge field, transverse and synchrotron motion are considered. Meanwhile, bunched ion beam cooling experiments have been carried out in the main cooling storage ring (CSRm) of the Heavy Ion Research Facility in Lanzhou (HIRFL), to investigate the minimum bunch length obtained by the cooling method, and study the dependence of the minimum bunch length on beam and machine parameters. It is observed that the IBS effect is dominant for low intensity beams, and the space charge effect is much more important for high intensity beams. The experimental results in CSRm shown a good agreement with the analytical model in the IBS dominated regime. The simulation work offers us comparable results to those from the analytical model both in IBS dominated and space charge dominated regimes.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-SAP2017-TUPH10
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TUPH11	Resonance Stop-bands Compensation for the Booster Ring at HIAF	153
	J. Li, J.C. Yang IMP/CAS, Lanzhou, People's Republic of China
	The Booster Ring (BRing) of the new approved High Intensity heavy-ion Accelerator Facility (HIAF) in China is designed to stack 1.0*10¹¹ number of 238U³⁵⁺ ions at the injection energy of 17MeV/u and deliver over such intensity beam to SRing (Spectrometer Ring) at 800MeV/u. However such intensity beam causes low-order resonances crossing during RF bunching. To keep a low beam loss, resonance stop-band compensation scheme is proposed covering the process from RF capture to the first stage of acceleration below 200MeV/u.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-SAP2017-TUPH11
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TUPH14	Calculation of the Gun and Collector for Electron Cooler of HIAF
	M.T. Tang, J. Li, L.J. Mao, X.D. Yang, H. Zhao IMP/CAS, Lanzhou, People's Republic of China
	The results of the gun and collector simulation for the coolers in BRing and SRing of new project High Intensity Heavy-ion Accelerator Facility HIAF (China) are presented. The electron beam current of the gun is up to 2A and distribution of the electron beam is adjustable. The highest electron beam energy is 50keV for cooler in Bring and 200keV for cooler in Sring. The results of the adiabatic expansion process and acceleration process of the electron beam are also presented. To control the electron beam transverse temperature increase in the end of the accelerate tube the special coil is used. After optimization the beam transverse temperature is lower than 0.1eV.
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Paper

Title

Page

RF Excitation Parameters in Resonant Extraction

59

J. Li, Y.J. Yuan
IMP/CAS, Lanzhou, People's Republic of China

Ion beam resonant slow extraction from synchrotron is extensively used in experimental nuclear and particle physics, material radiation science, and deep-seated malignant tumours radiotherapy. In this paper, the ion motion of resonant extraction under RF excitation are discussed. The expression of sweeping frequency waveforms used in tracking code of resonant extraction of are presented.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-SAP2017-MOPH16

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOPH17

Simulation of Beam Intensity Limitations under Space Charge Effects at BRing of HIAF

63

J. Li, J.C. Yang
IMP/CAS, Lanzhou, People's Republic of China

The booster ring (BRing) of the new approved High Intensity heavy-ion Accelerator Facility (HIAF) in China is designed to stack ²³⁸U³⁵⁺ ions at the injection energy of 17MeV/u and deliver 1.0*10¹¹ of uranium ions at 800MeV/u. Two injection modes, with or without the electron cooling, are introduced. The transverse emittance evolution and beam lifetime are investigated by simulation of RF capture process for the fast cycle mode.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-SAP2017-MOPH17

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOPH18

Investigation on the Suppression of Intrabeam Scattering in the High Intensity Heavy Ion Beam with the Help of Double-bunch of Electron

67

X.D. Yang, G.H. Li, J. Li, X.M. Ma, L.J. Mao, M.T. Tang, T.L. Yan, H. Zhao
IMP/CAS, Lanzhou, People's Republic of China

Intrabeam scattering is the main reason of degradation of the beam brightness and shortening of brightness lifetime in the collider, light source and storage ring. Electron cooling was chose to suppress the effect of intrabeam scattering, another unexpected effect happened during the cooling. The distribution of ion beam quickly deviates from the initial Gaussian type, form a denser core and long tail. The ions standing in the tail of beam will loss soon due to large amplitude. This solution will focus on the investigation on the suppression of intrabeam scattering in the high intensity heavy ion beam in the storage ring with the help of longitudinally modulated electron beam. The stronger cooling was expected in the tail of ion beam and the weaker cooling was performed in the tail of ion beam. The particle in the outside will experience stronger cooling and will be driven back into the centre of ion beam. The ion loss will be decreased and the lifetime will be increased. The intensity of ion beam in the storage ring will be kept and maintain for long time.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-SAP2017-MOPH18

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOPH20

Simulation of Electron Cooling on Bunched Ion Beam

70

H. Zhao, J. Li, L.J. Mao, M.T. Tang, J.C. Yang, X.D. Yang
IMP/CAS, Lanzhou, People's Republic of China

A combination of electron cooling and RF system is an effective method to compress the beam bunch length in storage rings. A simulation code based on multi-particle tracking was developed to calculate the bunched ion beam cooling process, in which the electron cooling, IntraBeam Scattering (IBS), ion beam space charge field, transverse and synchrotron motion are considered. In the paper, the cooling process was simulated for C beam in HIRFL-CSRm, and the result was compared with experiments, according to which the dependence of the minimum bunch length on beam and machine parameters was studied in the paper.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-SAP2017-MOPH20

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TUPH10

Electron Cooling of Bunched Ion Beam in Storage Ring

150

L.J. Mao, J. Li, X.M. Ma, M.T. Tang, J.C. Yang, X.D. Yang, H. Zhao
IMP/CAS, Lanzhou, People's Republic of China

Funding: This work is supported by the National Natural Science Foundation of China (Project No.11575264, No.11375245 and No.11475235) and the Hundred Talents Project of the Chinese Academy of Sciences.
A combination of electron cooling and RF system is an effective method to compress the beam bunch length in storage rings. A simulation code based on multi-particle tracking was developed to calculate the bunched ion beam cooling process, in which the electron cooling, Intra-Beam Scattering (IBS), ion beam space charge field, transverse and synchrotron motion are considered. Meanwhile, bunched ion beam cooling experiments have been carried out in the main cooling storage ring (CSRm) of the Heavy Ion Research Facility in Lanzhou (HIRFL), to investigate the minimum bunch length obtained by the cooling method, and study the dependence of the minimum bunch length on beam and machine parameters. It is observed that the IBS effect is dominant for low intensity beams, and the space charge effect is much more important for high intensity beams. The experimental results in CSRm shown a good agreement with the analytical model in the IBS dominated regime. The simulation work offers us comparable results to those from the analytical model both in IBS dominated and space charge dominated regimes.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-SAP2017-TUPH10

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPH11

Resonance Stop-bands Compensation for the Booster Ring at HIAF

153

J. Li, J.C. Yang
IMP/CAS, Lanzhou, People's Republic of China

The Booster Ring (BRing) of the new approved High Intensity heavy-ion Accelerator Facility (HIAF) in China is designed to stack 1.0*10¹¹ number of 238U³⁵⁺ ions at the injection energy of 17MeV/u and deliver over such intensity beam to SRing (Spectrometer Ring) at 800MeV/u. However such intensity beam causes low-order resonances crossing during RF bunching. To keep a low beam loss, resonance stop-band compensation scheme is proposed covering the process from RF capture to the first stage of acceleration below 200MeV/u.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-SAP2017-TUPH11

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPH14

Calculation of the Gun and Collector for Electron Cooler of HIAF

M.T. Tang, J. Li, L.J. Mao, X.D. Yang, H. Zhao
IMP/CAS, Lanzhou, People's Republic of China

The results of the gun and collector simulation for the coolers in BRing and SRing of new project High Intensity Heavy-ion Accelerator Facility HIAF (China) are presented. The electron beam current of the gun is up to 2A and distribution of the electron beam is adjustable. The highest electron beam energy is 50keV for cooler in Bring and 200keV for cooler in Sring. The results of the adiabatic expansion process and acceleration process of the electron beam are also presented. To control the electron beam transverse temperature increase in the end of the accelerate tube the special coil is used. After optimization the beam transverse temperature is lower than 0.1eV.

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)