Study on shunt impedance and voltage distribution of 4-rod RFQ cavity

ZHANG Zhou-Li; ZHAO Hong-Wei; XU Zhe; ZHANG Sheng-Hu; ZHANG Cong; SUN Lie-Peng; MEI Li-Rong; SHEN Xiao-Kang

doi:10.1088/1674-1137/34/3/018

Chinese Physics C> 2010, Vol. 34> Issue(3) : 398-401 DOI: 10.1088/1674-1137/34/3/018

Study on shunt impedance and voltage distribution of 4-rod RFQ cavity

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Abstract：
A high current RFQ (radio frequency quadrupole) is being studied at the Institute of Modern Physics, CAS for the direct plasma injection scheme. Shunt impedance is an important parameter when designing a 4-rod RFQ cavity, it reflects the RF efficiency of the cavity, and has a direct influence on the cost of the structure. Voltage distribution of a RFQ cavity has an effect on beam transmission, and particles would be lost if the actual voltage distribution is not as what it should be. The influence of cell length, stem thickness and height on shunt impedance and voltage distribution have been studied, in particular the effect of projecting electrodes has been investigated in detail.

References

[1]

. ZHANG Z L, Jameson R A, ZHAO Hong-Wei et al. Nuclear Instruments and Methods in Physics Research A, 2008,592(3): 1972. XIA J W et al. Nucl. Instrum. Methods A, 2002, 488(1-2):113. Fischer P, Schempp A. Tuning a CW 4-rod RFQ. Proceedings of LINAC 2006. Knoxville, Tennessee USA. 728-7304. Corlett J N. Experience with Cavity Design Programs. Proceedings of CERN Accelerator School on RF Engineering for Particle Accelerators. Oxford, UK, 1992, 2. 307-3175. Bricault P G et al. Simulation of the TRIUMF Split-ring 4-rod RFQ with MAFIA. Proc.of PAC 95. Dallas, TexasUSA. 1125-11276. Podlech H et al. Electromagnetic Design of an 80.5 MHzRFQ for the RIA Driver Linac. Proceedings of EPAC 2002.Paris, France. 942-9447. Lombardi A et al. Comparison Study of RFQ Structures for the Lead Ion LINAC at CREN. EPAC'92. Berlin, Ger-many: 1992. 557-5598. ZHANG Chuan. Research on High Current Radio Fre-quency Quadrupole Accelerators for Neutron Production.Doctoral Dissertation of Peking University, 2004. 65 (in Chinese)

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ZHANG Zhou-Li, ZHAO Hong-Wei, XU Zhe, ZHANG Sheng-Hu, ZHANG Cong, SUN Lie-Peng, MEI Li-Rong and SHEN Xiao-Kang. Study on shunt impedance and voltage distribution of 4-rod RFQ cavity[J]. Chinese Physics C, 2010, 34(3): 398-401. doi: 10.1088/1674-1137/34/3/018

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Received: 2009-04-03
Revised: 2009-05-20

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沈阳化工大学材料科学与工程学院沈阳 110142

Study on shunt impedance and voltage distribution of 4-rod RFQ cavity

Corresponding author: ZHANG Zhou-Li,

Received Date: 2009-04-03
Accepted Date: 2009-05-20
Available Online: 2010-03-05

Abstract:

A high current RFQ (radio frequency quadrupole) is being studied at the Institute of Modern Physics, CAS for the direct plasma injection scheme. Shunt impedance is an important parameter when designing a 4-rod RFQ cavity, it reflects the RF efficiency of the cavity, and has a direct influence on the cost of the structure. Voltage distribution of a RFQ cavity has an effect on beam transmission, and particles would be lost if the actual voltage distribution is not as what it should be. The influence of cell length, stem thickness and height on shunt impedance and voltage distribution have been studied, in particular the effect of projecting electrodes has been investigated in detail.