Study of Simultaneous Acceleration of Positive and Negative Ion Beams by Dynamic Simulation in RFQ

XING Qing-Zi; LIN Yu-Zheng; FU Shi-Nian; FANG Shou-Xian

Chinese Physics C> 2004, Vol. 28> Issue(6) : 659-663

Study of Simultaneous Acceleration of Positive and Negative Ion Beams by Dynamic Simulation in RFQ

Department of Engineering Physics,Tsinghua University,Beijing 100084,China2 Institute of High Energy Physics,Chinese Academy of Sciences,Beijing 100039,China

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Abstract：
An additional beam with opposite charge state is added into the dynamic simulation of the t-Code program PARMTEQ. The space charge effect and multi-bunch effect during the positive and negative ion beams acceleration are considered. The result is given for a four-vane type RFQ accelerator. The purpose of simulation is focused on the investigation of possible dynamic problems caused by two-beam acceleration in RFQ structure. Two-beam acceleration is prior to diminish the transverse space charge effect, but “trap” between opposite charge state ions in longitudinal position appears when the beam current is large, which is the main cause of the increasing number of longitudinal loss. Therefore new RFQ structures should be designed specially for two-beam acceleration to obtain higher transmission rate than single beam acceleration.

References

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. FANG Shou-Xian, FU Shi-Nian. The Foreland and Future of Science(Volume 5 ) . Bei jing: Chinese Environmental Science Press, 2002.194-206(in Chinese)(方守贤,傅世年.科学前沿与未来(第五集).北京:中国环境科学出版社,2002.194—206) 2. Hardy L. Accelerat or Reliability -Availability. In: Proc. of EPAC2002. Switzerland: CERN, 2002. 149-1533. YU Jin-Xiang, CHEN Jia-Er, REN Xiao-Tang et al. Atomic Energy Science and Technology, 2001, 35( 1) : 34-39(in Chinese)(于金祥,陈佳洱,任晓堂等.原子能科学技术,2001,35(1):34～39)4. Han J M, Cho Y S, Yoon B J et al. Design of the KOMAC H+ / H-RFQ Linac. In: C.E. Eyberger. Proc. of the XIX Internat ional LINAC Conference. Springfield, VA, U. S. A: National Technical Information Service, 1998. 774-7765. Crandall K R. Stokes R H, Wangler T P. RF quadrupole beamdynamics design studies. In: Proc. of the 1979 LINAC Conference.New York: U. S. Government Printing Office, 1980. 205 -2166. GUAN Xia-Ling, LUO Zi-Hua, FU Shi-Nian. Beam dynamic characterist ics of the 3. 5MeV RFQ Accelerat or in ADS. In: Report in IHEP, CAS. 2002 (in Chinese)(关遐龄,罗紫华,傅世年.与ADS相关的3.5MeVRFQ加速器的束流动力学特性.见:中科院高能所内部报告.2002) 7. XING Qing-Zi et al. HEP NP, 2003, 27( 7) : 628(inChinese)(邢庆子等.高能物理与核物理,2003,27(7):628)8. XING Qing-Zi, LIN Yu-Zheng, FU Shi-Nian. Application of PIC Method in z-Code t-Code Simulations of RFQ Accelerator. Nucl .Tech. , to be published(in Chinese)(邢庆子,林郁正,傅世年.PIC方法在RFQ加速器zCode和tCode模拟程序中的应用研究.核技术,待发表) 9. Hockney R W, Eastwood J W. Comput er simulation using particles.London: IOP Publishing Ltd. , 1988. 18-23

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XING Qing-Zi, LIN Yu-Zheng, FU Shi-Nian and FANG Shou-Xian. Study of Simultaneous Acceleration of Positive and Negative Ion Beams by Dynamic Simulation in RFQ[J]. Chinese Physics C, 2004, 28(6): 659-663.

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Received: 2003-09-22
Revised: 1900-01-01

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沈阳化工大学材料科学与工程学院沈阳 110142

Study of Simultaneous Acceleration of Positive and Negative Ion Beams by Dynamic Simulation in RFQ

Corresponding author: XING Qing-Zi,

Department of Engineering Physics,Tsinghua University,Beijing 100084,China2 Institute of High Energy Physics,Chinese Academy of Sciences,Beijing 100039,China

Received Date: 2003-09-22
Accepted Date: 1900-01-01
Available Online: 2004-06-05

Abstract: An additional beam with opposite charge state is added into the dynamic simulation of the t-Code program PARMTEQ. The space charge effect and multi-bunch effect during the positive and negative ion beams acceleration are considered. The result is given for a four-vane type RFQ accelerator. The purpose of simulation is focused on the investigation of possible dynamic problems caused by two-beam acceleration in RFQ structure. Two-beam acceleration is prior to diminish the transverse space charge effect, but “trap” between opposite charge state ions in longitudinal position appears when the beam current is large, which is the main cause of the increasing number of longitudinal loss. Therefore new RFQ structures should be designed specially for two-beam acceleration to obtain higher transmission rate than single beam acceleration.