Emittance Dominated Long Bunches in Dual Harmonic RF Systems

AN Shi-Zhong<SUP></SUP>; TANG Jing-Yu<SUP></SUP>

doi:10.1088/1674-1137/32/1/014

近期发现有不法分子冒充我刊与作者联系，借此进行欺诈等不法行为，请广大作者加以鉴别，如遇诈骗行为，请第一时间与我刊编辑部联系确认（《中国物理C》（英文）编辑部电话：010-88235947,010-88236950），并作报警处理。

本刊再次郑重声明：

（1）本刊官方网址为cpc.ihep.ac.cn和https://iopscience.iop.org/journal/1674-1137

（2）本刊采编系统作者中心是投稿的唯一路径，该系统为ScholarOne远程稿件采编系统，仅在本刊投稿网网址（https://mc03.manuscriptcentral.com/cpc）设有登录入口。本刊不接受其他方式的投稿，如打印稿投稿、E-mail信箱投稿等，若以此种方式接收投稿均为假冒。

（3）所有投稿均需经过严格的同行评议、编辑加工后方可发表，本刊不存在所谓的“编辑部内部征稿”。如果有人以“编辑部内部人员”名义帮助作者发稿，并收取发表费用，均为假冒。

《中国物理C》（英文）编辑部

2024年10月30日

Chinese Physics C> 2008, Vol. 32> Issue(1) : 60-66 DOI: 10.1088/1674-1137/32/1/014

Emittance Dominated Long Bunches in Dual Harmonic RF Systems

AN Shi-Zhong ^, ,
TANG Jing-Yu ,

Abstract
HTML
Reference
Related

PDF

Abstract：
The storage of long bunches for long time intervals needs flattened stationary buckets with large bucket height. In the case of small energy spread with a cooled beam, the Coulomb interaction cannot be ignored. The properties of the dual harmonic RF systems are discussed for the emittance dominated long bunches below transition. The external voltage has to be increased to compensate the Coulomb interaction to keep bunch length unchanged. The longitudinal motion of the initially mismatched beam has been studied for both single and dual harmonic RF system. Bucket height of the single harmonic system is too small even for 20 % mismatch. Halo formation and debunching can be seen after a few synchrotron periods for single particles with large amplitude. The simulation results by using ORBIT code for the FAIR-HESR synchrotron has been given together with theoretical analysis.

[1]	HUANG Guo-Qing , YE Kai-Rong . Beam Measurement Using Digital Technology. Chinese Physics C, 2008, 32(S1): 142-144.
[2]	BI Yuan-Jie , ZHANG Tian-Jue , JI Bin , YAO Hong-Juan , AN Shi-Zhong , XING Jian-Sheng , TANG Chuan-Xiang . Research on RF Cavity Tolerance of CYCIAE-100. Chinese Physics C, 2008, 32(S1): 163-165.
[3]	LIU Wei-Bin , WANG Shu-Hong , YE Qiang , WANG Lin . Emittance Measurement at BEPCⅡ Linac. Chinese Physics C, 2008, 32(S1): 86-88.
[4]	DAI Zhi-Yong , ZHANG Wen-Wei , XIE Yu-Tong , LI Hong , ZHANG Kai-Zhi , ZHANG Lin-Wen , LI Wei-Feng , LIU Cheng-Jun , DENG Jian-Jun , DING Bo-Nan . Development of Beam Transport System of “Dragon-Ⅰ”LIA. Chinese Physics C, 2007, 31(4): 395-399.
[5]	ZHENG Jian-Hua , LIU Wei , WANG Yi-Fang , WANG Yan-Mou , MA Wei-Nian , YIN Yan , SONG Hai-Hong . High Sensitivity Beam Phase Measurement System for Isochronous Cyclotron. Chinese Physics C, 2007, 31(3): 303-306.
[6]	ZHANG Jin-Quan , SONG Ming-Tao , WEI Bao-Wen . Design of Synchrotron for Hadron Therapy. Chinese Physics C, 2007, 31(12): 1122-1125.
[7]	HU Wei , ZHANG Jing , QI Xin . A Digital Control Scheme of Power Supply System for RCS/CSNS. Chinese Physics C, 2007, 31(11): 1062-1066.
[8]	SUN Bao-Gen , ZHENG Pu , LU Ping , XU Hong-Liang , WANG Jun-Hua , WANG Ji-Gang , WANG Bao-Yun . Development of New Beam Profile and Emittance Measurement System for HLS. Chinese Physics C, 2006, 30(8): 792-796.
[9]	GU Peng-Da , GEN Zhe-Qiao , CUI Yan-Yan , PEI Guo-Xi , WANG Shu-Hong . Design Studies of RF Phasing System for BEPCII Linac. Chinese Physics C, 2005, 29(3): 316-320.
[10]	YIN Ming , ZHOU Xiao-Yan . Studies on Wehnelt of Electron-Beam Accelerator. Chinese Physics C, 2005, 29(3): 301-304.
[11]	XING Qing-Zi , FU Shi-Nian , LIN Yu-Zheng , FANG Shou-Xian . Calculation of Beam Acceptance for RFQ Accelerators. Chinese Physics C, 2003, 27(7): 628-632.
[12]	GU Peng-Da , PEI Guo-Xi , WANG Shu-Hong . SLED System for Long Pulse Multi-bunch Linac. Chinese Physics C, 2001, 25(4): 348-353.
[13]	Chen Yinbao , Huang Zhibin . Nonlinear Space Charge Effects and Emittance Growth in Linac. Chinese Physics C, 1999, 23(12): 1231-1242.
[14]	Zhang Chuang . Beam Energy Correction in Synchrotrons. Chinese Physics C, 1999, 23(3): 308-312.
[15]	Chen Yinbao , Huang Zhibin , FuShinian . Scaling Law of Emittance Growth for Bunched Beam with Gaussian Density Distribution in Both Longitudinal and Transverse Directions in Linac. Chinese Physics C, 1997, 21(7): 657-663.
[16]	WANG Shu-Hong . RFQ's Beam Dynamics and RF Structure. Chinese Physics C, 1993, 17(4): 310-321.
[17]	LUO ZI-HUA , LUO YING-XIONG , WANG LIN-LIN . STUDY OF THE BEAM TRAMSVERSE MOTION IN THE RFQ STRUCTURE. Chinese Physics C, 1982, 6(6): 688-696.
[18]	FANG SHOU-XIAN . COMPENSATION OF THE SPACE CHARGE FORCE IN A SYNCHROTRON BY MEANS OF RF QUADRUPOLE. Chinese Physics C, 1981, 5(2): 169-175.
[19]	Ye Si-zong , Zhu Yu-cheng , Liu Gui-lin , Shao Bei-bei , Xiao Ting-han , . ASSESSMENT OF THE RADIOLOGICAL IMPACT OF THE 50 GeV BPS¹⁾ ON ITS ENVIRONMENT. Chinese Physics C, 1980, 4(6): 694-705.
[20]	XU JIAN-MING , CAI ZHI-GUO . THE TRACKING PROBLEM IN POWER SUPPLIES FOR SEPARATED FUNCTION MAGNET SYSTEMS OF FAST CYCLING SYNCHROTRONS. Chinese Physics C, 1979, 3(1): 27-33.

Access

Get Citation

AN Shi-Zhong, TANG Jing-Yu and Emittance Dominated Long Bunches in Dual Harmonic RF Systems[J]. Chinese Physics C, 2008, 32(1): 60-66. doi: 10.1088/1674-1137/32/1/014

AN Shi-Zhong, TANG Jing-Yu and Emittance Dominated Long Bunches in Dual Harmonic RF Systems[J]. Chinese Physics C, 2008, 32(1): 60-66. doi: 10.1088/1674-1137/32/1/014 shu

RIS(for EndNote,Reference Manager,ProCite)

BibTex

Txt

Milestone

Received: 2006-10-26
Revised: 2007-07-13

Article Metric

Article Views(2697)
PDF Downloads(608)
Cited by(0)

Policy on re-use

To reuse of subscription content published by CPC, the users need to request permission from CPC, unless the content was published under an Open Access license which automatically permits that type of reuse.

通讯作者: 陈斌, bchen63@163.com

1.
沈阳化工大学材料科学与工程学院沈阳 110142

Emittance Dominated Long Bunches in Dual Harmonic RF Systems

AN Shi-Zhong ^,
TANG Jing-Yu

Corresponding author: AN Shi-Zhong,

Received Date: 2006-10-26
Accepted Date: 2007-07-13
Available Online: 2008-01-05

Abstract: The storage of long bunches for long time intervals needs flattened stationary buckets with large bucket height. In the case of small energy spread with a cooled beam, the Coulomb interaction cannot be ignored. The properties of the dual harmonic RF systems are discussed for the emittance dominated long bunches below transition. The external voltage has to be increased to compensate the Coulomb interaction to keep bunch length unchanged. The longitudinal motion of the initially mismatched beam has been studied for both single and dual harmonic RF system. Bucket height of the single harmonic system is too small even for 20 % mismatch. Halo formation and debunching can be seen after a few synchrotron periods for single particles with large amplitude. The simulation results by using ORBIT code for the FAIR-HESR synchrotron has been given together with theoretical analysis.