Cyclotrons2016 - List of Authors (Liang, Z.K.)

Paper	Title	Page
MOD01	Design of the Energy Selection System for Proton Therapy Based on GEANT4	30
	Z.K. Liang, W. Chen, X. Liu, J. Zha Huazhong University of Science and Technology, State Key Laboratory of Advanced Electromagnetic Engineering and Technology,, Hubei, People's Republic of China K.F. Liu, B. Qin HUST, Wuhan, People's Republic of China
	Huazhong University of Science and Technology (HUST) has planned to build a proton therapy facility based on an isochronous superconducting cyclotron. The 250 MeV/500 nA proton beam is extracted from a super-conducting cyclotron. To modulate beam energy, an en-ergy selection system is essential in the beam-line. The simulation based on Geant4 has been performed for the energy selection system and its result will be discussed in this paper. This paper introduces the variation rules of the beam parameters including the beam energy, beam emit-tance, energy spread and transmission. The degrader's gap and the twiss parameter are proven to be effective ways to reduce the emittance after degrader.
	Slides MOD01 [2.331 MB]
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MODM01	Design Study of the 250 MeV Isochronous Superconducting Cyclotron Magnet	33
	W. Chen, Z.K. Liang, X. Liu Huazhong University of Science and Technology, State Key Laboratory of Advanced Electromagnetic Engineering and Technology,, Hubei, People's Republic of China K. Fan, K.F. Liu, B. Qin HUST, Wuhan, People's Republic of China
	Superconducting cyclotron is an optimum choice to deliver high quality continuous wave (CW) proton beams for proton therapy with its compactness and power saving. Field isochronism and tune optimization are the two crucial factors of cyclotrons during the magnet design. This paper is concentrated on the superconducting magnet design, mainly including the spiral magnet, isochronous field and the tune optimization. The main parameters and some features of the machine will be presented.
	Slides MODM01 [0.623 MB]
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MODM04	Design of the Fast Scanning Magnets for HUST Proton Therapy Facility	42
	X. Liu, W. Chen, Z.K. Liang Huazhong University of Science and Technology, State Key Laboratory of Advanced Electromagnetic Engineering and Technology,, Hubei, People's Republic of China Q.S. Chen, K.F. Liu, B. Qin HUST, Wuhan, People's Republic of China
	Funding: Work supported by Major State Research & Development Program, with grant No. 2016YFC0105305 For implementation of proton therapy, Huazhong University of Science and Technology has planned to construct a 250 MeV/500 nA superconducting cyclotron for proton therapy. In the beam-line, the scanning system spreads out the proton beam on the target according to the complex tumor shape by two magnets for horizontal and vertical scanning independently. As dipole magnets are excited by alternating currents and the maximum repetition rate is up to 100 Hz, the eddy currents are expected to be large. This paper introduces the design of these two scanning magnets and analyzes the eddy current effect. Slits in the end pole are proven to be an effective way to reduce the eddy current. Different directions, distributions and width sizes of slits are simulated and compared to determine the slits arrangement. At last, the maximum temperature of the optimized scanning magnets reaches the temperature requirements.
	Slides MODM04 [2.092 MB]
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MOP12	Fast Scanning Beamline Design Applied to Proton Therapy System Based on Superconducting Cyclotrons	79
	B. Qin, Q.S. Chen, K. Fan, M. Fan, K.F. Liu, P. Tan HUST, Wuhan, People's Republic of China W. Chen, Z.K. Liang, X. Liu, T. Yu Huazhong University of Science and Technology, State Key Laboratory of Advanced Electromagnetic Engineering and Technology,, Hubei, People's Republic of China
	Funding: Work supported by The National Key Research and Development Pro-gram of China, with grant No. 2016YFC0105305 Proton therapy is recognized as one of the most effec-tive radiation therapy method for cancers. The super-conducting cyclotron becomes an optimum choice for delivering high quality CW proton beam with features including compactness, low power consuming and higher extraction efficiency. This paper introduces de-sign considerations of the beamline with fast scanning features for proton therapy system based on supercon-ducting cyclotrons. The beam optics, the energy selec-tion system (ESS) and the gantry beamline will be de-scribed.
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Paper

Title

Page

Design of the Energy Selection System for Proton Therapy Based on GEANT4

30

Z.K. Liang, W. Chen, X. Liu, J. Zha
Huazhong University of Science and Technology, State Key Laboratory of Advanced Electromagnetic Engineering and Technology,, Hubei, People's Republic of China
K.F. Liu, B. Qin
HUST, Wuhan, People's Republic of China

Huazhong University of Science and Technology (HUST) has planned to build a proton therapy facility based on an isochronous superconducting cyclotron. The 250 MeV/500 nA proton beam is extracted from a super-conducting cyclotron. To modulate beam energy, an en-ergy selection system is essential in the beam-line. The simulation based on Geant4 has been performed for the energy selection system and its result will be discussed in this paper. This paper introduces the variation rules of the beam parameters including the beam energy, beam emit-tance, energy spread and transmission. The degrader's gap and the twiss parameter are proven to be effective ways to reduce the emittance after degrader.

Slides MOD01 [2.331 MB]

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MODM01

Design Study of the 250 MeV Isochronous Superconducting Cyclotron Magnet

33

W. Chen, Z.K. Liang, X. Liu
Huazhong University of Science and Technology, State Key Laboratory of Advanced Electromagnetic Engineering and Technology,, Hubei, People's Republic of China
K. Fan, K.F. Liu, B. Qin
HUST, Wuhan, People's Republic of China

Superconducting cyclotron is an optimum choice to deliver high quality continuous wave (CW) proton beams for proton therapy with its compactness and power saving. Field isochronism and tune optimization are the two crucial factors of cyclotrons during the magnet design. This paper is concentrated on the superconducting magnet design, mainly including the spiral magnet, isochronous field and the tune optimization. The main parameters and some features of the machine will be presented.

Slides MODM01 [0.623 MB]

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MODM04

Design of the Fast Scanning Magnets for HUST Proton Therapy Facility

42

X. Liu, W. Chen, Z.K. Liang
Huazhong University of Science and Technology, State Key Laboratory of Advanced Electromagnetic Engineering and Technology,, Hubei, People's Republic of China
Q.S. Chen, K.F. Liu, B. Qin
HUST, Wuhan, People's Republic of China

Funding: Work supported by Major State Research & Development Program, with grant No. 2016YFC0105305
For implementation of proton therapy, Huazhong University of Science and Technology has planned to construct a 250 MeV/500 nA superconducting cyclotron for proton therapy. In the beam-line, the scanning system spreads out the proton beam on the target according to the complex tumor shape by two magnets for horizontal and vertical scanning independently. As dipole magnets are excited by alternating currents and the maximum repetition rate is up to 100 Hz, the eddy currents are expected to be large. This paper introduces the design of these two scanning magnets and analyzes the eddy current effect. Slits in the end pole are proven to be an effective way to reduce the eddy current. Different directions, distributions and width sizes of slits are simulated and compared to determine the slits arrangement. At last, the maximum temperature of the optimized scanning magnets reaches the temperature requirements.

Slides MODM04 [2.092 MB]

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MOP12

Fast Scanning Beamline Design Applied to Proton Therapy System Based on Superconducting Cyclotrons

79

B. Qin, Q.S. Chen, K. Fan, M. Fan, K.F. Liu, P. Tan
HUST, Wuhan, People's Republic of China
W. Chen, Z.K. Liang, X. Liu, T. Yu
Huazhong University of Science and Technology, State Key Laboratory of Advanced Electromagnetic Engineering and Technology,, Hubei, People's Republic of China

Funding: Work supported by The National Key Research and Development Pro-gram of China, with grant No. 2016YFC0105305
Proton therapy is recognized as one of the most effec-tive radiation therapy method for cancers. The super-conducting cyclotron becomes an optimum choice for delivering high quality CW proton beam with features including compactness, low power consuming and higher extraction efficiency. This paper introduces de-sign considerations of the beamline with fast scanning features for proton therapy system based on supercon-ducting cyclotrons. The beam optics, the energy selec-tion system (ESS) and the gantry beamline will be de-scribed.

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