CYCLOTRONS 2010 - List of Authors (Xing, J.S.)

Paper	Title	Page
MOPCP026	Beam Extraction System for CYCIAE-14	105
	S.M. Wei, S. An, W.P. Hu, M. Li, Y.L. Lu, L.P. Wen, H.D. Xie, J.S. Xing, Z.G. Yin, T.J. Zhang CIAE, Beijing, People's Republic of China
	A 14MeV medical cyclotron is under design and construction at CIAE, and H⁻ ion will be accelerated and extracted by carbon stripper in dual opposite direction. Two stripping points are chosen in each extracting direction to extract proton beams to different targets or beam lines to extend the use of the machine. Two modes have been considered for the extraction system. One is designed to be installed on the wall of the vacuum cavity, and the other is designed to be inserted vertically from the sector poles. The final choice depends on the agility, simplicity and results of the experimentation. The angle between the stripper and the beam orbit is optimized to improve the extracted beam quality. The results of numerical simulation show the two stripping points at each extraction direction, the beam orbit and the beam characteristic at each extraction direction. The comparison of the beam envelope of different stripper azimuth is also presented in this paper to show the influence of the stripper azimuth. Based on the concept design, the mechanical design and the experimentation of the DC motor in magnetic field have been conducted, with the results shown in the paper as well.

MOPCP067	Design and Primary Test of Full Scale Cavity of CYCIAE-100	183
	B. Ji, P.Z. Li, J. Lin, G.S. Liu, G.F. Pan, Z.H. Wang, J.S. Xing, Z.G. Yin, S.P. Zhang, T.J. Zhang, Z.L. Zhao CIAE, Beijing, People's Republic of China
	The engineering of the RF cavity for cyclotron concerns several aspects of the system including vacuum, cooling, mechanical support etc, Sometime it is even more complex than the RF design itself. With limit space in a compact cyclotron, in order to achieve a voltage distribution of 60kV in central orbit and 120kV for outer orbit, a double stem double gap λ by 2 cavities has been designed for CYCIAE-100[1]. The RF resonance of the cavity is simulated [1] by finite integral codes, while the thermal analysis and mechanical tolerance are studied using other approaches [2, 3]. The mechanical design and fabrications is then carried out under these directions, resulting in a full scale cavity model. The simulations and the mechanical design will be reported in this paper, followed with low level measurement results of quality factor, shunt impedance curve along accelerating gap etc. After surface polishing, the measurement yields an unloaded Q value of 9300, which matches well with the simulation with a neglectable difference of several hundreds. The high power test of the cavity will be carried out later, and will be given in separate paper presented at this conference. [1] Tianjue Zhang,et al, 100 MeV H⁻ Cyclotron as an RIB Driving Accelerator, CYC 2004 [2] Yuanjie Bi, et al, The Study on RF Cavity Tolerance for CYCIAE-100, CYC 2007 [3] S.M. Wei, et al, Thermal Analysis of RF Cavity for CYCIAE-100, CYC 2007

Paper

Title

Page

Beam Extraction System for CYCIAE-14

105

S.M. Wei, S. An, W.P. Hu, M. Li, Y.L. Lu, L.P. Wen, H.D. Xie, J.S. Xing, Z.G. Yin, T.J. Zhang
CIAE, Beijing, People's Republic of China

A 14MeV medical cyclotron is under design and construction at CIAE, and H⁻ ion will be accelerated and extracted by carbon stripper in dual opposite direction. Two stripping points are chosen in each extracting direction to extract proton beams to different targets or beam lines to extend the use of the machine. Two modes have been considered for the extraction system. One is designed to be installed on the wall of the vacuum cavity, and the other is designed to be inserted vertically from the sector poles. The final choice depends on the agility, simplicity and results of the experimentation. The angle between the stripper and the beam orbit is optimized to improve the extracted beam quality. The results of numerical simulation show the two stripping points at each extraction direction, the beam orbit and the beam characteristic at each extraction direction. The comparison of the beam envelope of different stripper azimuth is also presented in this paper to show the influence of the stripper azimuth. Based on the concept design, the mechanical design and the experimentation of the DC motor in magnetic field have been conducted, with the results shown in the paper as well.

MOPCP067

Design and Primary Test of Full Scale Cavity of CYCIAE-100

183

B. Ji, P.Z. Li, J. Lin, G.S. Liu, G.F. Pan, Z.H. Wang, J.S. Xing, Z.G. Yin, S.P. Zhang, T.J. Zhang, Z.L. Zhao
CIAE, Beijing, People's Republic of China

The engineering of the RF cavity for cyclotron concerns several aspects of the system including vacuum, cooling, mechanical support etc, Sometime it is even more complex than the RF design itself. With limit space in a compact cyclotron, in order to achieve a voltage distribution of 60kV in central orbit and 120kV for outer orbit, a double stem double gap λ by 2 cavities has been designed for CYCIAE-100[1]. The RF resonance of the cavity is simulated [1] by finite integral codes, while the thermal analysis and mechanical tolerance are studied using other approaches [2, 3]. The mechanical design and fabrications is then carried out under these directions, resulting in a full scale cavity model. The simulations and the mechanical design will be reported in this paper, followed with low level measurement results of quality factor, shunt impedance curve along accelerating gap etc. After surface polishing, the measurement yields an unloaded Q value of 9300, which matches well with the simulation with a neglectable difference of several hundreds. The high power test of the cavity will be carried out later, and will be given in separate paper presented at this conference.
[1] Tianjue Zhang,et al, 100 MeV H⁻ Cyclotron as an RIB Driving Accelerator, CYC 2004
[2] Yuanjie Bi, et al, The Study on RF Cavity Tolerance for CYCIAE-100, CYC 2007
[3] S.M. Wei, et al, Thermal Analysis of RF Cavity for CYCIAE-100, CYC 2007