Suppression of HOM's on a Prototype Superconducting Cavity by Absorbers

LIN Zhi-Gang; ZHOU Lin; CHEN Huai-Bi; ZHAO Zhen-Tang

Chinese Physics C> 2003, Vol. 27> Issue(8) : 735-738

Suppression of HOM's on a Prototype Superconducting Cavity by Absorbers

Department of Engineering Physics, Tsinghua University, Beijing 100084, China2 Institute of High Energy Physics, CAS, Beijing 100039, China

Abstract
HTML
Reference
Related

PDF

Abstract：
Higher-order modes (HOM's) excited in the Superconducting Cavity (SCC) can be damped through many ways. Microwave absorbers, HOM' s couplers, coaxial waveguides and other devices are used to achieve this aim. The recent status of the R&D on an 800MHz Prototype SCC being developed is presented in this paper. For the cavity, the HOM' s damping by absorbers is obtained with the large beam duct. A low power measurement on a prototype cavity has been carried out and the Q-values of HOM's are confirmed to be drastically reduced. Two types of ferrite as absorbers are investigated to achieve the function of damping the HOM' s. The modes we concerned focus in the range of 0.8-2.7GHz. By means of changing the parameters of the ferrite used in the cavity, a conclusion about the damping is acquired . Measurements indicate that most of the HOM' s in this range are effectively absorbed and damped at the presupposition that the basic mode is not affected. A few special modes are pointed out, which cannot be absorbed by means of absorbers because they cannot propagate out of the cavity. The two types of ferrite used in this project have similar property with the same value of B, equal to 1500Gs and the different values of e equal to 14, 16 respectively. In order to study the relation between the parameters of ferrite and the damping effect, further research will be carried out sequential- ly.

References

[1]

Koseki T, Izawa M, Kamiyet Y. PAC, 1995, 3:1794–17962 Moffat D, Barnes P, Kirchgessner J et al. PAC, 1993, 2:977–979 3 Koseki T, Izawa M, Kamiya Y. PAC, 1993, 2:930–9324 Izawa M, Sakanaka S, Takahashi T et al. PAC, 1999, 2:904–906 5 Tajima T, Asano K, Furuya T et al. PAC, 1995, 3:1620–16226 ZHANG Ke–Qian et al. Microwave Photo Guided Wave Tech., 1994,8(9) :311–315(in Chinese)(张克潜等.微波与光导波技术,1994,8(9) :311–315)

[1]	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.
[2]	ZHANG Yao-Feng , WANG Yong , WEI Wei , WANG Jian-Ping , FAN Le , GUAN Chang-Ying , LIU Zu-Ping . Photon Stimulated Desorption Studies on Stainless Steel Material with and without TiN Film Coating. Chinese Physics C, 2008, 32(S1): 34-36.
[3]	ZHANG Yao-Feng , WANG Yong , WEI Wei , WANG Jian-Ping , FAN Le , GUAN Chang-Ying , LIU Zu-Ping . Secondary Electron Yield Studies on Vacuum Materials. Chinese Physics C, 2008, 32(S1): 68-70.
[4]	SUN Yi , WANG Guang-Wei , PAN Wei-Min , LI Zhong-Quan , HUANG Hong , MA Qiang , LIN Hai-Ying , XU Bo , WANG Qun-Yao , LI Shao-Peng , HE Kun , LIU Ya-Ping . First Superconducting RF System Commissioning for BEPCⅡ in China. Chinese Physics C, 2008, 32(S1): 191-193.
[5]	PAN Wei-Min , WANG Guang-Wei , . Calculation of the External Quality Factor of the High Power Input Coupler for the BEPCII Superconducting Cavity. Chinese Physics C, 2008, 32(1): 72-74. doi: 10.1088/1674-1137/32/1/016
[6]	JI Bin , ZHAO Zhen-Lu , ZHANG Tian-Jue , XING Jian-Sheng , WANG Xiu-Long , YIN Zhi-Guo , HOU Shi-Gang , XIA Le . Theoretical and Practical Study on RF Model Cavity of 100MeV H^－ Cyclotron. Chinese Physics C, 2008, 32(S1): 160-162.
[7]	ZHU Feng , QUAN Sheng-Wen , ZHAO Kui , CHEN Jia-Er . Study on High Order Modes of a β=0.45,f=350MHz Spoke Cavity. Chinese Physics C, 2006, 30(10): 1006-1009.
[8]	GE Ming-Qi , ZHAO Sheng-Chu , SUN Hong , GAO Jie . Design study on 1.3GHz Mono-cell High Gradient Low Loss Superconducting Cavity. Chinese Physics C, 2006, 30(4): 354-358.
[9]	ZHONG Juan , PAN Wei-Min . Study on the Performance of the Input Coupler for the BEPCⅡ Superconducting RF Cavity. Chinese Physics C, 2006, 30(10): 1014-1017.
[10]	PEI Shi-Lun , WANG Shu-Hong . RF Electro Magnetic Field Effects on the 571.2MHz Normal Conducting Subharmonic Buncher. Chinese Physics C, 2005, 29(9): 912-917.
[11]	HAO Jian-Kui , ZHAO Kui , ZHU Feng . Researches on Bake Effect on RF Superconducting Cavities. Chinese Physics C, 2005, 29(9): 918-922.
[12]	ZHU Kun , GUO Zhi-Yu , FANG Jia-Xun , GAO Shu-Li , SONG Xiang-Xiang . The Simulation and Experiment Study of a 4 Rod RFQ RF Property. Chinese Physics C, 2005, 29(5): 512-516.
[13]	WANG Gui-Mei , WU Wen-Zong , Xiangyang LU , ZHANG Bao-Cheng , QUAN Sheng-Wen , ZHU Feng , LIN LIN , JIAO Fei , ZHAO Kui . Study on HOMs in 1+1/2 Cell Superconducting Cavity. Chinese Physics C, 2005, 29(11): 1077-1080.
[14]	PAN Wei-Min , SUN Yi , WANG Guang-Wei , Takaaki Furuya , ichi Kurokawa . Studies on Higher Order Modes in BEPCⅡ Superconducting Cavity. Chinese Physics C, 2004, 28(3): 317-320.
[15]	XU Zhong-Xiong , WANG Fang-An , QI Xin . Experimental Studies on Sub-Harmonic Suppression of Magnet Power Supply. Chinese Physics C, 2003, 27(7): 637-640.
[16]	LI Zhong-Quan , ZHANG Chuang . Study of Heavily Damped SC RF Cavity. Chinese Physics C, 2003, 27(10): 919-925.
[17]	PAN Wei-Min . Higher Order Modes Impedance and Damping Study for the LHC Capture Cavity. Chinese Physics C, 2002, 26(10): 1087-1092.
[18]	HAO Jian-Kui , ZHAO Kui , ZHANG Bao-Cheng , XIE Da-Lin , WANG Li-Fang , QUAN Sheng-Wen , SHEN Zi-Lin , TANG Yu-Xing , ZHANG Yun-Chi , YANG Xi , HU Yan-Le , ZHAO Kun . Researches and Preliminary Experiments on Copper-Niobium Sputtered Low-β Superconducting Resonator. Chinese Physics C, 2001, 25(6): 582-587.
[19]	Zhao Zhentang . HOMs Power Generated by Unequany Spaced and Populated Bunches in Storage Ring. Chinese Physics C, 1999, 23(9): 914-921.
[20]	Zu Donglin , Chen jiaer . Study on SRF Multicell Accelerating Cavity for Linear Collider and Trapped Modes. Chinese Physics C, 1997, 21(2): 180-186.

Access

Get Citation

LIN Zhi-Gang, ZHOU Lin, CHEN Huai-Bi and ZHAO Zhen-Tang. Suppression of HOM's on a Prototype Superconducting Cavity by Absorbers[J]. Chinese Physics C, 2003, 27(8): 735-738.

LIN Zhi-Gang, ZHOU Lin, CHEN Huai-Bi and ZHAO Zhen-Tang. Suppression of HOM's on a Prototype Superconducting Cavity by Absorbers[J]. Chinese Physics C, 2003, 27(8): 735-738. shu

RIS(for EndNote,Reference Manager,ProCite)

BibTex

Txt

Milestone

Received: 2002-11-19
Revised: 1900-01-01

Article Metric

Article Views(2795)
PDF Downloads(633)
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

Suppression of HOM's on a Prototype Superconducting Cavity by Absorbers

Corresponding author: LIN Zhi-Gang,

Department of Engineering Physics, Tsinghua University, Beijing 100084, China2 Institute of High Energy Physics, CAS, Beijing 100039, China

Received Date: 2002-11-19

Accepted Date: 1900-01-01

Available Online: 2003-08-05

Abstract: Higher-order modes (HOM's) excited in the Superconducting Cavity (SCC) can be damped through many ways. Microwave absorbers, HOM' s couplers, coaxial waveguides and other devices are used to achieve this aim. The recent status of the R&D on an 800MHz Prototype SCC being developed is presented in this paper. For the cavity, the HOM' s damping by absorbers is obtained with the large beam duct. A low power measurement on a prototype cavity has been carried out and the Q-values of HOM's are confirmed to be drastically reduced. Two types of ferrite as absorbers are investigated to achieve the function of damping the HOM' s. The modes we concerned focus in the range of 0.8-2.7GHz. By means of changing the parameters of the ferrite used in the cavity, a conclusion about the damping is acquired . Measurements indicate that most of the HOM' s in this range are effectively absorbed and damped at the presupposition that the basic mode is not affected. A few special modes are pointed out, which cannot be absorbed by means of absorbers because they cannot propagate out of the cavity. The two types of ferrite used in this project have similar property with the same value of B, equal to 1500Gs and the different values of e equal to 14, 16 respectively. In order to study the relation between the parameters of ferrite and the damping effect, further research will be carried out sequential- ly.

HTML

Reference (1)

Suppression of HOM's on a Prototype Superconducting Cavity by Absorbers

Abstract：

References

Access

Article Metrics

Metrics

通讯作者: 陈斌, bchen63@163.com

Email This Article