SAP2014 - List of Authors (Li, P.)

Paper	Title	Page
WEPH09	Concept Design of the Collimation System in the CSRm	44
	P. Li, Z. Chai, P. Jiang, J. Meng, J.C. Yang, Y.J. Yuan, W.H. Zheng IMP, Lanzhou, People's Republic of China
	Funding: National Natural Science Foundation of China (Projects No. 11305227). The heavy ion beams would be easily lost at the vacuum chamber along the CSRm when it is used to accumulate the intermediate charge state particles. The vacuum pressure bump due to the ion-induced desorption in turn leads to an increase in beam loss rate. In order to avoid the complete beam loss, the collimation system is investigated in the CSRm. The beam loss distribution is simulated considering the particle charge exchanged process. Then the collimation efficiency of the lost particle is calculated and optimized under different collimator's position, geometry, and beam emittance and so on. Furthermore, the closed orbit distortion which is caused by different types of error in the ring will affect the collimation efficiency. The collimation efficiency of the lost particles in the CSRm is investigated by taking real magnet alignment errors into consideration. Two prototype collimators are under designing and will be tested in the CSRm.

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.

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

WEPH35	APF DTL Design Besed on iMpAPF	90
	P. Jiang, C. Li, P. Li, Z.J. Wang, Y.J. Yuan IMP, Lanzhou, People's Republic of China
	Alternative phase focusing (APF) DTL has advantages in price and space. However, the designing of APF is difficult because of the jumping phases. In order to design and simulate a proper APF, a code iMpAPF(i Multi-particle APF) has been developed. RK4 is introduced in this code for calculation, and the soul of the code is smoothness. Theoretically, the particle tracing figures out that the theoretic phase advance ratio between longitudinal direction and transversal direction is close to 2. Based on this code, a C⁵⁺, 200 MHz, medium energy APF as a linear injector of a synchrotron used for cancer therapy has been designed. This paper focuses on the development of iMpAPF, and also several results obtained from the code are shown.

Paper

Title

Page

Concept Design of the Collimation System in the CSRm

44

P. Li, Z. Chai, P. Jiang, J. Meng, J.C. Yang, Y.J. Yuan, W.H. Zheng
IMP, Lanzhou, People's Republic of China

Funding: National Natural Science Foundation of China (Projects No. 11305227).
The heavy ion beams would be easily lost at the vacuum chamber along the CSRm when it is used to accumulate the intermediate charge state particles. The vacuum pressure bump due to the ion-induced desorption in turn leads to an increase in beam loss rate. In order to avoid the complete beam loss, the collimation system is investigated in the CSRm. The beam loss distribution is simulated considering the particle charge exchanged process. Then the collimation efficiency of the lost particle is calculated and optimized under different collimator's position, geometry, and beam emittance and so on. Furthermore, the closed orbit distortion which is caused by different types of error in the ring will affect the collimation efficiency. The collimation efficiency of the lost particles in the CSRm is investigated by taking real magnet alignment errors into consideration. Two prototype collimators are under designing and will be tested in the CSRm.

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.

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

WEPH35

APF DTL Design Besed on iMpAPF

90

P. Jiang, C. Li, P. Li, Z.J. Wang, Y.J. Yuan
IMP, Lanzhou, People's Republic of China

Alternative phase focusing (APF) DTL has advantages in price and space. However, the designing of APF is difficult because of the jumping phases. In order to design and simulate a proper APF, a code iMpAPF(i Multi-particle APF) has been developed. RK4 is introduced in this code for calculation, and the soul of the code is smoothness. Theoretically, the particle tracing figures out that the theoretic phase advance ratio between longitudinal direction and transversal direction is close to 2. Based on this code, a C⁵⁺, 200 MHz, medium energy APF as a linear injector of a synchrotron used for cancer therapy has been designed. This paper focuses on the development of iMpAPF, and also several results obtained from the code are shown.