IPAC2016 - List of Authors (Zheng, H.J.)

Paper	Title	Page
WEPMB028	High HOM Damping Structure Study for CEPC	2183
	Z.C. Liu, J. Gao, S. Jin, Y. Wang, H.J. Zheng IHEP, Beijing, People's Republic of China
	Both large circular collider such as CEPC and high current ERL facility need high HOM damping superconducting cavity. The slotted cavity is an option for such applications. It has three slotted waveguides which can highly damp the HOM and extract high HOM power out. However, the HOM absorbers for such facility are usually put outside of the cryomodule to decrease the influence of HOM power on the cryogenic system. Large slot waveguide need to make smaller transition structure to adapt this situation. A rectangular waveguide to coaxial waveguide structure was designed to the slotted cavity. In this paper, we will show the cavity HOM damping design scheme with this structure.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPMB028
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WEPMB032	Fabrication and Testing Status of IHEP03	2194
	T.X. Zhao, J. Gao, S. Jin, Z.Q. Li, Y.L. Liu, Z.C. Liu, Y. Wang, J.Y. Zhai, H.J. Zheng IHEP, Beijing, People's Republic of China M. Asano, E. Kako KEK, Ibaraki, Japan H. Yu, H. Yuan BIAM, Beijing, People's Republic of China
	After the successful development of the IHEP01 and IHEP02 1.3GHz 9cell superconducting cavity, we developed a 1.3GHz Tesla-Like 9cell superconducting cavities in collaboration with KEK. The cavity was made by niobium material produced in OTIC, Ningxia, China. After completeing welding, leakage check, BCP, HPR, we sent the cavity to KEK and used the standard procedures of ILC cavity for processing. These include electron polishing, vacuum furnace outgassing, tuning for field flatness and frequency, light EP, baking and vertical test. We target to have a high Q0 cavity for this experiment. In this paper, we will report the experimental status of the IHEP03 cavity.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPMB032
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THPOR015	CEPC Bunch Lengthening and Cavity HOM Analysis	3805
	H.J. Zheng, J. Gao, Y. Wang IHEP, Beijing, People's Republic of China
	In this paper we will show the higher order mode (HOM) analysis of the cavity for the Circular Electron-Positron Collider (CEPC) partial double ring (PDR) scheme. In order to study the single bunch longitudinal instability in CEPC, bunch lengthening and energy spread are estimated based on Gao's theory. Different models are used to study the bunch lengthening and energy spread of the ring.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPOR015
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Paper

Title

Page

High HOM Damping Structure Study for CEPC

2183

Z.C. Liu, J. Gao, S. Jin, Y. Wang, H.J. Zheng
IHEP, Beijing, People's Republic of China

Both large circular collider such as CEPC and high current ERL facility need high HOM damping superconducting cavity. The slotted cavity is an option for such applications. It has three slotted waveguides which can highly damp the HOM and extract high HOM power out. However, the HOM absorbers for such facility are usually put outside of the cryomodule to decrease the influence of HOM power on the cryogenic system. Large slot waveguide need to make smaller transition structure to adapt this situation. A rectangular waveguide to coaxial waveguide structure was designed to the slotted cavity. In this paper, we will show the cavity HOM damping design scheme with this structure.

DOI •

reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPMB028

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEPMB032

Fabrication and Testing Status of IHEP03

2194

T.X. Zhao, J. Gao, S. Jin, Z.Q. Li, Y.L. Liu, Z.C. Liu, Y. Wang, J.Y. Zhai, H.J. Zheng
IHEP, Beijing, People's Republic of China
M. Asano, E. Kako
KEK, Ibaraki, Japan
H. Yu, H. Yuan
BIAM, Beijing, People's Republic of China

After the successful development of the IHEP01 and IHEP02 1.3GHz 9cell superconducting cavity, we developed a 1.3GHz Tesla-Like 9cell superconducting cavities in collaboration with KEK. The cavity was made by niobium material produced in OTIC, Ningxia, China. After completeing welding, leakage check, BCP, HPR, we sent the cavity to KEK and used the standard procedures of ILC cavity for processing. These include electron polishing, vacuum furnace outgassing, tuning for field flatness and frequency, light EP, baking and vertical test. We target to have a high Q0 cavity for this experiment. In this paper, we will report the experimental status of the IHEP03 cavity.

DOI •

reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPMB032

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPOR015

CEPC Bunch Lengthening and Cavity HOM Analysis

3805

H.J. Zheng, J. Gao, Y. Wang
IHEP, Beijing, People's Republic of China

In this paper we will show the higher order mode (HOM) analysis of the cavity for the Circular Electron-Positron Collider (CEPC) partial double ring (PDR) scheme. In order to study the single bunch longitudinal instability in CEPC, bunch lengthening and energy spread are estimated based on Gao's theory. Different models are used to study the bunch lengthening and energy spread of the ring.

DOI •

reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPOR015

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)