CYCLOTRONS 2010 - List of Authors (Yang, J.J.)

Paper	Title	Page
MOPCP030	The Injection Line and Central Region Design of CYCIAE-70	111
	M. Li, X.L. Jia, Y.L. Lu, C. Wang, J.J. Yang, H.J. Yao, T.J. Zhang CIAE, Beijing, People's Republic of China
	A compact cyclotron CYCIAE-70 is under design at CIAE capable of providing both 70MeV, 700μA H⁻ beam and 35MeV, 40μA D- beam. Both beams are produced by a single external multicusp ion source, injected axially with a transport line and bent onto the median plane through a spiral inflector. The injection line utilizes two solenoids and a quadruple triplet for transverse focusing and a buncher to increase the injection efficiency. The beam optics design is performed using TRANSOPTR, taking into account space charge effects and neutralization. The inflector is capable of bending both H⁻ and D- beams with a transmission efficiency of over 80%. The central particles are tracked backwards to obtain the initial reference orbit of the first several turns. The electrode structures and the shape of Dee tips are then optimized to achieve matching at the inflector exit and to maximize the acceptance of central region. The central region is capable to accept both beams without component replacement. The preliminary design results of the injection line, spiral inflector and center region are elaborated, and the beam matching from the ion source to the central region is presented.

MOPCP045	Towards Quantitative Predictions of High Power Cyclotrons	144
	Y.J. Bi, J.J. Yang, T.J. Zhang CIAE, Beijing, People's Republic of China A. Adelmann, R. Dölling, J.M. Humbel, W. Joho, M. Seidel PSI, Villigen, Switzerland Y.J. Bi Tsinghua University, Beijing, People's Republic of China C.-X. Tang TUB, Beijing, People's Republic of China
	The large and complex structure of cyclotrons poses great challenges in the precise simulation of high power beams. However, such simulation capabilities are mandatory in the design and operation of the next generation high power proton drivers. The powerful tool OPAL enables us to do large scale simulations including 3D space charge and particle matter interactions. A large scale simulation effort is presented in the paper, which leads to a better quantitative understanding of the existing PSI high power proton cyclotron facility and predicts the beam behavior of CYCIAE-100 under construction at CIAE. The beam power of 1.3 MW delivered by the PSI 590 MeV Ring Cyclotron together with stringent requirements regarding the controlled and uncontrolled beam losses poses great challenges to predictive simulations. The comparisons with measurements show that OPAL can precisely predict the radial beam pattern at extraction with large dynamic range (3-4 orders of magnitude). The new particle matter interaction model is used to obtain necessary beam loss statistics during the acceleration. This data is indispensable in the design of an efficient collimation system in CYCIAE-100.

MOPCP102	Transmission Efficiency Study of SSC	258
	H.F. Hao, J.F. Gao, Q.X. Guo, G.H. Han, A.P. Li, X.M. Su, A.J. Wang, S.X. Wang, C.L. Xie, J.J. Yang, W.Q. Yang, Y.P. Yang, H.W. Zhao IMP, Lanzhou, People's Republic of China
	The transmission efficiency of HIFIL-SSC had been studied. We found the main reasons of the lower transmission efficiency, and some advices was put forward to improve the transmission efficiency.

Paper

Title

Page

The Injection Line and Central Region Design of CYCIAE-70

111

M. Li, X.L. Jia, Y.L. Lu, C. Wang, J.J. Yang, H.J. Yao, T.J. Zhang
CIAE, Beijing, People's Republic of China

A compact cyclotron CYCIAE-70 is under design at CIAE capable of providing both 70MeV, 700μA H⁻ beam and 35MeV, 40μA D- beam. Both beams are produced by a single external multicusp ion source, injected axially with a transport line and bent onto the median plane through a spiral inflector. The injection line utilizes two solenoids and a quadruple triplet for transverse focusing and a buncher to increase the injection efficiency. The beam optics design is performed using TRANSOPTR, taking into account space charge effects and neutralization. The inflector is capable of bending both H⁻ and D- beams with a transmission efficiency of over 80%. The central particles are tracked backwards to obtain the initial reference orbit of the first several turns. The electrode structures and the shape of Dee tips are then optimized to achieve matching at the inflector exit and to maximize the acceptance of central region. The central region is capable to accept both beams without component replacement. The preliminary design results of the injection line, spiral inflector and center region are elaborated, and the beam matching from the ion source to the central region is presented.

MOPCP045

Towards Quantitative Predictions of High Power Cyclotrons

144

Y.J. Bi, J.J. Yang, T.J. Zhang
CIAE, Beijing, People's Republic of China
A. Adelmann, R. Dölling, J.M. Humbel, W. Joho, M. Seidel
PSI, Villigen, Switzerland
Y.J. Bi
Tsinghua University, Beijing, People's Republic of China
C.-X. Tang
TUB, Beijing, People's Republic of China

The large and complex structure of cyclotrons poses great challenges in the precise simulation of high power beams. However, such simulation capabilities are mandatory in the design and operation of the next generation high power proton drivers. The powerful tool OPAL enables us to do large scale simulations including 3D space charge and particle matter interactions. A large scale simulation effort is presented in the paper, which leads to a better quantitative understanding of the existing PSI high power proton cyclotron facility and predicts the beam behavior of CYCIAE-100 under construction at CIAE. The beam power of 1.3 MW delivered by the PSI 590 MeV Ring Cyclotron together with stringent requirements regarding the controlled and uncontrolled beam losses poses great challenges to predictive simulations. The comparisons with measurements show that OPAL can precisely predict the radial beam pattern at extraction with large dynamic range (3-4 orders of magnitude). The new particle matter interaction model is used to obtain necessary beam loss statistics during the acceleration. This data is indispensable in the design of an efficient collimation system in CYCIAE-100.

MOPCP102

Transmission Efficiency Study of SSC

258

H.F. Hao, J.F. Gao, Q.X. Guo, G.H. Han, A.P. Li, X.M. Su, A.J. Wang, S.X. Wang, C.L. Xie, J.J. Yang, W.Q. Yang, Y.P. Yang, H.W. Zhao
IMP, Lanzhou, People's Republic of China

The transmission efficiency of HIFIL-SSC had been studied. We found the main reasons of the lower transmission efficiency, and some advices was put forward to improve the transmission efficiency.