Studies of dual-harmonic acceleration at CSNS-Ⅱ

CHEN Jin-Fang; TANG Jing-Yu

doi:10.1088/1674-1137/34/10/018

Chinese Physics C> 2010, Vol. 34> Issue(10) : 1643-1648 DOI: 10.1088/1674-1137/34/10/018

Studies of dual-harmonic acceleration at CSNS-Ⅱ

CHEN Jin-Fang ^, ,
TANG Jing-Yu

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Abstract：
The Rapid Cycling Synchrotron (RCS) of the China Spallation Neutron Source (CSNS) complex is designed to provide 1.56×10¹³ protons per pulse (ppp) during the initial stage, and it is upgradeable to 3.12×10¹³ ppp during the second stage and 6.24×10¹³ ppp during the ultimate stage. The high beam intensity in the RCS requires alleviation of space charge effects to reduce beam losses, which is key in such high beam power accelerators. With higher intensities in the upgrading phases, a dual-harmonic RF system is planned to produce flat-topped bunches that are useful to reduce the space charge effects. We have studied different schemes to apply the dual-harmonic acceleration in CSNS-Ⅱ, and have calculated the main parameters of the RF systems, which are presented in this paper.

References

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WEI J,CHEN H S,CHEN Y W et al.Nucl.Instrum.Methods Phys.Res.A,2009,600:10-13[2] CSNS Accelerator Team.Conceptual Design on Chinese Spallation Neutron Source-Accelerators,2004.IHEPCSNS-Report/2004-01E(in Chinese)[3] Baillod J M,Magnani L,Nassibian G et al.IEEE Trans.Nucl.Sci.,1983,30:3499-3501[4] Brennan J M,Roser T.Proc.of PAC1999.New York,1999.614-616[5] Middendorf M E,Brumwell F R,Dooling J C et al.Proc.of PAC2007.Albuquerque,New Mexico,2007.2233-2235[6] Seville A,Gardner I,Thomseon J et al.Proc.of EPAC2008.Genoa,2008.349-351[7] Tamura F,Yamamoto M,Yoshii M et al.Phys.Rev.ST Accel.Beams,2009,12:041001-041009[8] Prior C.Studies of Dual Harmonic Acceleration in ISIS.ICANS Ⅻ,RAL Report 94025,1994.A11[9] QIU J,TANG J Y,WANG S et al.HEP NP,2007,31(10):942-946(in Chinese)[10] Hofmann A,Pedersen F.IEEE Trans.Nucl.Sci.,1979,26:3526-3528[11] Lee S Y.Accelerator Physics.Singapore:World Scientific Publishing Co.Pte.Ltd.,1999.229-230[12] Laslett L J.On Intensity Limitations Imposed by Transverse Space-Charge Effects in Circular Particle Accelerators.Proc.1963 Summer Sch.BNL,1963.324-326[13] Duke J P,Rees G H,Trotman J V et al.Dual Harmonic Acceleration.ESS 94-12-R,August 1994

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CHEN Jin-Fang and TANG Jing-Yu. Studies of dual-harmonic acceleration at CSNS-Ⅱ[J]. Chinese Physics C, 2010, 34(10): 1643-1648. doi: 10.1088/1674-1137/34/10/018

CHEN Jin-Fang and TANG Jing-Yu. Studies of dual-harmonic acceleration at CSNS-Ⅱ[J]. Chinese Physics C, 2010, 34(10): 1643-1648. doi: 10.1088/1674-1137/34/10/018 shu

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Received: 2009-11-02
Revised: 2010-01-14

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通讯作者: 陈斌, bchen63@163.com

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沈阳化工大学材料科学与工程学院沈阳 110142

Studies of dual-harmonic acceleration at CSNS-Ⅱ

Corresponding author: CHEN Jin-Fang,

Received Date: 2009-11-02

Accepted Date: 2010-01-14

Available Online: 2010-10-05

Abstract:

The Rapid Cycling Synchrotron (RCS) of the China Spallation Neutron Source (CSNS) complex is designed to provide 1.56×10¹³ protons per pulse (ppp) during the initial stage, and it is upgradeable to 3.12×10¹³ ppp during the second stage and 6.24×10¹³ ppp during the ultimate stage. The high beam intensity in the RCS requires alleviation of space charge effects to reduce beam losses, which is key in such high beam power accelerators. With higher intensities in the upgrading phases, a dual-harmonic RF system is planned to produce flat-topped bunches that are useful to reduce the space charge effects. We have studied different schemes to apply the dual-harmonic acceleration in CSNS-Ⅱ, and have calculated the main parameters of the RF systems, which are presented in this paper.

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Studies of dual-harmonic acceleration at CSNS-Ⅱ

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