IPAC2013 - List of Authors (Yuan, Y.J.)

Paper

Title

Page

Research on the Design and Simulation of the CSRE Stochastic Cooling System

169

X.J. Hu, H. Jia, Y.J. Yuan, X.H. Zhang
IMP, Lanzhou, People's Republic of China

Stochastic cooling by the use of a feedback system, aims at cooling of secondary particles or particles with large emittance or momentum spread. My research is mainly on the simulation of horizontal and longitudinal stochastic cooling process. The purpose of my work is to obtain the optimum parameters for stochastic cooling, according the actual accelerator lattice. Pickup and preamplifier are already installed on the CSRe, and preliminary results are get.

MOPFI041

Study of Beam Longitudinal Motion for SSC

378

X.N. Li, Y.J. Yuan
IMP, Lanzhou, People's Republic of China

The injection, acceleration and extraction of SSC（Separate Sector Cyclotron） is analyzed and simulated to get the longitudinal acceptance, using the typical ion 238U³⁶⁺ with energy 9.7MeV/u. In order to study the actual longitudinal acceptance of SSC, the isochronous magnetic field model in coincidence with the real one is established by Kr-Kb and Lagrange methods based on the actual measurement. Under the isochronous magnetic field, the longitudinal acceptance at the injection, acceleration and extraction is calculated. From the simulation results the transmission efficiency is very low in SSC because of the large phase width of the beam from the injector SFC (Sector Focus Cyclotron). In the machine commissioning, the phase width of the beam line from SFC to SSC is measured by the phase probe, the results show that the actual phase width is larger than the acceptance of SSC.

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]

WEPEA030

Simulation of Beam Capture Process in HIRFL-CSRm

2564

P. Li, P. Jiang, J.W. Xia, J.C. Yang, Y.J. Yuan
IMP, Lanzhou, People's Republic of China

In this paper, the beam capture processes are simulated in CSRm with the real RF cavity curves. By now, CSRm can accelerate all ions from protons up to the heaviest element, uranium, with variable energies and different efficiency. During the beam capture processes, the capture voltage and capture time must be cheese properly to avoid the beam loss. Moreover, the mismatch between the actual and the setting beam energy and space charge effect are investigated for high beam capture efficiency. The evolution of longitudinal phase space during the capture processes is presented in this simulation too.

WEPEA031

Slow extraction design in HIMM

2567

J. Shi, W.P. Chai, J.W. Xia, J.C. Yang, Y.J. Yuan
IMP, Lanzhou, People's Republic of China

A heavy ion medical machine(HIMM) is proposed for cancer therapy in Lanzhou, China. The slow extraction design of the synchrotron is introduced in this paper. Eight sextupoles are used, four of them are for correcting the chromaticity and the rest for driving the 3rd-order resonance. In order to save the aperture of vacuum chamber, a 3-magnet bump is adopted during the extraction process. The phase space map in the entrance of the electrostatic septum and the last 3 turns' particle trajectory before particle extraction are given.

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.

THPWO056

A 5.3 MeV/U, 200MHz APF DTL for Carbon Ions as an Injector of Medical Synchrotron

3890

P. Jiang, Y.J. Yuan
IMP, Lanzhou, People's Republic of China

A new low energy medium frequency DTL for 12C⁵⁺ with alternative phase focusing method (APF), which has advantage in compact space and low cost, was designed as an injector of medical synchrotron. There is no conventional focusing elements in the APF DTL, and transversal focusing is realized using RF field by varying synchronous phase instead. The envelopes of beam size are presented and the emittance change of six-dimension phase space is shown. The simple method proposed by Y. Iwata was used to create synchronous phase array. Since the motion between transversal and longitudinal plains are coupled, the longitudinal acceptance of the DTL is not large.

THPWO059

Beam Dynamics Design of the Main Accelerating Section with KONUS in the CSR-LINAC Proposal

3895

X.H. Zhang, H. Du, J.W. Xia, X. Yin, Y.J. Yuan
IMP, Lanzhou, People's Republic of China

The CSR-LINAC as the injector of the Cooling Storage Ring (CSR) has been proposed in Heavy Ion Research Facility in Lanzhou (HIRFL). The injection linac mainly consists of two Linacs, the Radio Frequency Quadrupole linac (RFQ) and the Drift Tube Linac (DTL). The KONUS (Kombinierte Null Grad Struktur) concept has been introduced to the drift tube linac section. In this paper, the re-matching of the main accelerating section will be finished in the 3.7MeV/u scheme and the new beam dynamics design updating to 7MeV/u will be shown. Through the beam re-matching, the relative emittance growth has been suppressed greatly along the linac. The KONUS structure is also adopted in the beam dynamics design that update from 3.7MeV/u to 7MeV/u and the good beam quality and transmission is shown.

Paper	Title	Page
MOPEA042	Research on the Design and Simulation of the CSRE Stochastic Cooling System	169
	X.J. Hu, H. Jia, Y.J. Yuan, X.H. Zhang IMP, Lanzhou, People's Republic of China
	Stochastic cooling by the use of a feedback system, aims at cooling of secondary particles or particles with large emittance or momentum spread. My research is mainly on the simulation of horizontal and longitudinal stochastic cooling process. The purpose of my work is to obtain the optimum parameters for stochastic cooling, according the actual accelerator lattice. Pickup and preamplifier are already installed on the CSRe, and preliminary results are get.

MOPFI041	Study of Beam Longitudinal Motion for SSC	378
	X.N. Li, Y.J. Yuan IMP, Lanzhou, People's Republic of China
	The injection, acceleration and extraction of SSC（Separate Sector Cyclotron） is analyzed and simulated to get the longitudinal acceptance, using the typical ion 238U³⁶⁺ with energy 9.7MeV/u. In order to study the actual longitudinal acceptance of SSC, the isochronous magnetic field model in coincidence with the real one is established by Kr-Kb and Lagrange methods based on the actual measurement. Under the isochronous magnetic field, the longitudinal acceptance at the injection, acceleration and extraction is calculated. From the simulation results the transmission efficiency is very low in SSC because of the large phase width of the beam from the injector SFC (Sector Focus Cyclotron). In the machine commissioning, the phase width of the beam line from SFC to SSC is measured by the phase probe, the results show that the actual phase width is larger than the acceptance of SSC.

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]

WEPEA030	Simulation of Beam Capture Process in HIRFL-CSRm	2564
	P. Li, P. Jiang, J.W. Xia, J.C. Yang, Y.J. Yuan IMP, Lanzhou, People's Republic of China
	In this paper, the beam capture processes are simulated in CSRm with the real RF cavity curves. By now, CSRm can accelerate all ions from protons up to the heaviest element, uranium, with variable energies and different efficiency. During the beam capture processes, the capture voltage and capture time must be cheese properly to avoid the beam loss. Moreover, the mismatch between the actual and the setting beam energy and space charge effect are investigated for high beam capture efficiency. The evolution of longitudinal phase space during the capture processes is presented in this simulation too.

WEPEA031	Slow extraction design in HIMM	2567
	J. Shi, W.P. Chai, J.W. Xia, J.C. Yang, Y.J. Yuan IMP, Lanzhou, People's Republic of China
	A heavy ion medical machine(HIMM) is proposed for cancer therapy in Lanzhou, China. The slow extraction design of the synchrotron is introduced in this paper. Eight sextupoles are used, four of them are for correcting the chromaticity and the rest for driving the 3rd-order resonance. In order to save the aperture of vacuum chamber, a 3-magnet bump is adopted during the extraction process. The phase space map in the entrance of the electrostatic septum and the last 3 turns' particle trajectory before particle extraction are given.

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.

THPWO056	A 5.3 MeV/U, 200MHz APF DTL for Carbon Ions as an Injector of Medical Synchrotron	3890
	P. Jiang, Y.J. Yuan IMP, Lanzhou, People's Republic of China
	A new low energy medium frequency DTL for 12C⁵⁺ with alternative phase focusing method (APF), which has advantage in compact space and low cost, was designed as an injector of medical synchrotron. There is no conventional focusing elements in the APF DTL, and transversal focusing is realized using RF field by varying synchronous phase instead. The envelopes of beam size are presented and the emittance change of six-dimension phase space is shown. The simple method proposed by Y. Iwata was used to create synchronous phase array. Since the motion between transversal and longitudinal plains are coupled, the longitudinal acceptance of the DTL is not large.

THPWO059	Beam Dynamics Design of the Main Accelerating Section with KONUS in the CSR-LINAC Proposal	3895
	X.H. Zhang, H. Du, J.W. Xia, X. Yin, Y.J. Yuan IMP, Lanzhou, People's Republic of China
	The CSR-LINAC as the injector of the Cooling Storage Ring (CSR) has been proposed in Heavy Ion Research Facility in Lanzhou (HIRFL). The injection linac mainly consists of two Linacs, the Radio Frequency Quadrupole linac (RFQ) and the Drift Tube Linac (DTL). The KONUS (Kombinierte Null Grad Struktur) concept has been introduced to the drift tube linac section. In this paper, the re-matching of the main accelerating section will be finished in the 3.7MeV/u scheme and the new beam dynamics design updating to 7MeV/u will be shown. Through the beam re-matching, the relative emittance growth has been suppressed greatly along the linac. The KONUS structure is also adopted in the beam dynamics design that update from 3.7MeV/u to 7MeV/u and the good beam quality and transmission is shown.