SAP2017 - List of Authors (Li, M.)

Paper	Title	Page
MOPH01	The Acceleration and Extraction Simulation for Pulsed Beam with Different Phase Width for CYCIAE-100	25
	S. An, L.C. Cao, F.P. Guan, L.Y. Ji, M. Li, X.T. Lu, C. Wang, Y. Wang, S.M. Wei, L.P. Wen, D.S. Zhang, T.J. Zhang CIAE, Beijing, People's Republic of China
	A 100 MeV H⁻ compact cyclotron (CYCIAE-100) has started operation from 2016 at China Institute of Atomic Energy (CIAE). The continuous proton beams of 75 MeV - 100 MeV has been extracted in dual opposite directions by charge exchange stripping devices. In order to analyze the extracted proton beam characteristics and control the beam loss for extracting 200 μA proton beam, the acceleration and stripping extraction process for the pulsed beam for CYCIAE-100 are simulated with the code of COMA in detail in this paper. The simulations are mainly done for the different RF acceptance or acceleration phase width. Due to the simulation results, the extraction turns are more for the large phase width and it will be reduced effectively with small phase width. The transverse beam distribution and the extracted beam profile are not affected by the initial phase width due to the simulation, that's the characters of the cyclotron with the stripping extraction mode.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-SAP2017-MOPH01
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MOPH02	Beam Extraction Design for a 230 MeV Superconducting Cyclotron	28
	M. Li, S. An, T. Cui, T. Ge, J.C. Qin, C. Wang, S.M. Wei, D.S. Zhang, T.J. Zhang CIAE, Beijing, People's Republic of China
	Proton Therapy is a high accuracy cancer treatment way with little side effects and widely investigated in recent years. Introducing superconducting technologies, China Institute of Atomic Energy has designed a cyclotron to extract 230 MeV proton for cancer therapy. Extracted beam loss is one of the very crucial parameter in this machine. A low beam loss has benefit in reducing the dose level inside the cyclotron and preventing device damage, and consequently keeps the machine operate stable in long time. Two electrostatic deflectors are installed in the adjacent magnet hills to deflect the beam for extraction. The Vr=1 resonance and precession motion are introduced in extraction region to enlarge the turn separation. After the deflectors, passive magnetic channels provide radial focusing force to restrain the beam dispersion in the edge field. In this paper, the design process and simulation results will be introduced in detail. Also, the extraction element layout will be illustrated.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-SAP2017-MOPH02
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MOPH03	Envelope Control of the Extracted Beam From Compact Cyclotron	31
	S.M. Wei, S. An, M. Li, P.Z. Li, G.F. Song, T.J. Zhang CIAE, Beijing, People's Republic of China
	Along with the fast development of cyclotrons, more and more compact cyclotrons are used in the medical treatment and the scientific research. Because of the compact structure, the magnetic field in the extraction area is complex and there is no room for the focusing elements, the methods to control beam envelope in extraction area are needed. In this paper, the influence of envelope caused by the angle between the foil and the beam has been studied, the experiment on a 14 MeV compact cyclotron that construct in CIAE (China Institute of Atomic Energy) has been done, the result is well agrees with the theoretic design. For the small medical cyclotrons, this method can be used to adjust the beam spot on the liquid target which installs on the exit of the cyclotron.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-SAP2017-MOPH03
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MOPH04	Some Initial Results of Central Region Orbit Tracking for Superconducting Cyclotron CYCIAE-230	34
	D.S. Zhang, S. An, F.P. Guan, X.L. Jia, M. Li, C. Wang, S.M. Wei, T.J. Zhang CIAE, Beijing, People's Republic of China
	CYCIAE-230 superconducting cyclotron, a medical accelerator for proton therapy, is designing and constructing at CIAE now. An internal PIG source was adopted to attain a compact and simple design. Central region electric and magnetic field design will directly affect the beam quality and reliability of the cyclotron in terms of phase selection, beam loss and beam stability. Moreover, a favourable central region will ensure single-turn extraction efficiency. The central region study was based on detailed orbit tracking results, including the beam behaviour in the push-pull RF mode and phase selection and axial focusing in the latest magnetic field and electrical field distribution from calculation. The physical design results of central region beam dynamics are presented here.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-SAP2017-MOPH04
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Paper

Title

Page

The Acceleration and Extraction Simulation for Pulsed Beam with Different Phase Width for CYCIAE-100

25

S. An, L.C. Cao, F.P. Guan, L.Y. Ji, M. Li, X.T. Lu, C. Wang, Y. Wang, S.M. Wei, L.P. Wen, D.S. Zhang, T.J. Zhang
CIAE, Beijing, People's Republic of China

A 100 MeV H⁻ compact cyclotron (CYCIAE-100) has started operation from 2016 at China Institute of Atomic Energy (CIAE). The continuous proton beams of 75 MeV - 100 MeV has been extracted in dual opposite directions by charge exchange stripping devices. In order to analyze the extracted proton beam characteristics and control the beam loss for extracting 200 μA proton beam, the acceleration and stripping extraction process for the pulsed beam for CYCIAE-100 are simulated with the code of COMA in detail in this paper. The simulations are mainly done for the different RF acceptance or acceleration phase width. Due to the simulation results, the extraction turns are more for the large phase width and it will be reduced effectively with small phase width. The transverse beam distribution and the extracted beam profile are not affected by the initial phase width due to the simulation, that's the characters of the cyclotron with the stripping extraction mode.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-SAP2017-MOPH01

Export •

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

MOPH02

Beam Extraction Design for a 230 MeV Superconducting Cyclotron

28

M. Li, S. An, T. Cui, T. Ge, J.C. Qin, C. Wang, S.M. Wei, D.S. Zhang, T.J. Zhang
CIAE, Beijing, People's Republic of China

Proton Therapy is a high accuracy cancer treatment way with little side effects and widely investigated in recent years. Introducing superconducting technologies, China Institute of Atomic Energy has designed a cyclotron to extract 230 MeV proton for cancer therapy. Extracted beam loss is one of the very crucial parameter in this machine. A low beam loss has benefit in reducing the dose level inside the cyclotron and preventing device damage, and consequently keeps the machine operate stable in long time. Two electrostatic deflectors are installed in the adjacent magnet hills to deflect the beam for extraction. The Vr=1 resonance and precession motion are introduced in extraction region to enlarge the turn separation. After the deflectors, passive magnetic channels provide radial focusing force to restrain the beam dispersion in the edge field. In this paper, the design process and simulation results will be introduced in detail. Also, the extraction element layout will be illustrated.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-SAP2017-MOPH02

Export •

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

MOPH03

Envelope Control of the Extracted Beam From Compact Cyclotron

31

S.M. Wei, S. An, M. Li, P.Z. Li, G.F. Song, T.J. Zhang
CIAE, Beijing, People's Republic of China

Along with the fast development of cyclotrons, more and more compact cyclotrons are used in the medical treatment and the scientific research. Because of the compact structure, the magnetic field in the extraction area is complex and there is no room for the focusing elements, the methods to control beam envelope in extraction area are needed. In this paper, the influence of envelope caused by the angle between the foil and the beam has been studied, the experiment on a 14 MeV compact cyclotron that construct in CIAE (China Institute of Atomic Energy) has been done, the result is well agrees with the theoretic design. For the small medical cyclotrons, this method can be used to adjust the beam spot on the liquid target which installs on the exit of the cyclotron.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-SAP2017-MOPH03

Export •

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

MOPH04

Some Initial Results of Central Region Orbit Tracking for Superconducting Cyclotron CYCIAE-230

34

D.S. Zhang, S. An, F.P. Guan, X.L. Jia, M. Li, C. Wang, S.M. Wei, T.J. Zhang
CIAE, Beijing, People's Republic of China

CYCIAE-230 superconducting cyclotron, a medical accelerator for proton therapy, is designing and constructing at CIAE now. An internal PIG source was adopted to attain a compact and simple design. Central region electric and magnetic field design will directly affect the beam quality and reliability of the cyclotron in terms of phase selection, beam loss and beam stability. Moreover, a favourable central region will ensure single-turn extraction efficiency. The central region study was based on detailed orbit tracking results, including the beam behaviour in the push-pull RF mode and phase selection and axial focusing in the latest magnetic field and electrical field distribution from calculation. The physical design results of central region beam dynamics are presented here.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-SAP2017-MOPH04

Export •

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