SAP2017 - List of Authors (Pei, S.)

Paper	Title	Page
MOPH22	Primary Design of 4 a S-band Linac using Slotted Iris Structure for Hom Damping	76
	J. Pang, S. Chen, X. He CAEP/IFP, Mainyang, Sichuan, People's Republic of China S. Pei, H. Shi, J.R. Zhang IHEP, Beijing, People's Republic of China
	A S-band LINAC with the operating frequency of 2856MHz and beam current of 4 A was designed for flash X-ray radiography for hydrodynamic test. The optimization of the parameters of the LINAC was processed to achieve the minimum beam radius and the proper energy efficiency. For the purpose of reducing the beam orbits offset at the exit of LINAC, a slotted iris accelerating structure would be employed to suppress the transverse Higher Order Modes (HOMs) by cutting four radial slots in the iris to couple the HOMs to SiC loads. In this paper, we present the design of the LINAC and the results of beam dynamic analysis.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-SAP2017-MOPH22
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MOPH23	Studies on the S-band Bunching System with the Hybrid Accelerating Structure	79
	S. Pei, B. Gao IHEP, Beijing, People's Republic of China
	Funding: Supported by the National Natural Science Foundation of China (11475201) and the Youth Innovation Promotion Association of Chinese Academy of Sciences, China. A standard bunching system is usually composed of a SW PB, a TW B and a standard accelerating structure. In the industrial area, the bunching system is usually simpli-fied by eliminating the PB and integrating the B and the standard accelerating structure together to form a β-varied accelerating structure. The bunching efficiency for this kind of simplified system is lower than that for the stand-ard one. The HB has been proved to be an innovative attempt to reduce the cost but preserve the beam quality as much as possible. Here, the HAS is proposed by inte-grating the PB, the B and the standard accelerating struc-ture together to exclusively simplify the standard bunch-ing system. Compared to the standard bunching system, the one with the HAS is more compact, and the cost is lowered to the largest extent without fairly degrading the beam performance. The proposed HAS can be widely applied in the industrial area.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-SAP2017-MOPH23
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MOPH26	CEPC Linac Design and Error Study	89
	C. Meng, Y.L. Chi, X.P. Li, G. Pei, S. Pei, D. Wang, J.R. Zhang IHEP, Beijing, People's Republic of China
	Circular Electron-Positron Collider (CEPC) is a 100 km ring e⁺ e⁻ collider for a Higgs factory, including the double ring for collider and the injector. The injector is composed of the linac and booster. The linac of CEPC is a normal conducting S-band linac with frequency in 2856.75 MHz and provide electron and positron beam at an energy up to 10 GeV with bunch charge in 1.0 nC and repetition frequency in 100 Hz. The linac scheme will be detailed discussed. The beam dynamic results with short-range Wakefields and detailed error study including misalignment errors and field errors also be presented.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-SAP2017-MOPH26
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MOPH27	Design Studies on an S-band Hybrid Accelerating Structure	92
	B. Gao, Y.L. Chi, S. Pei IHEP, Beijing, People's Republic of China
	Funding: Supported by the National Natural Science Foundation of China (11475201) and the Youth Innovation Promotion Association of Chinese Academy of Sciences, China. In an electron linac, the composition of the bunching system is determined by the synthetical consideration of the beam performance and the construction cost. In the industrial area, the bunching system is usually simplified to reduce the construction cost by eliminating the PB and integrating the B and the standard accelerating structure to form the β-varied structure. The bunching performance for this kind of system is relatively worse than that for the standard one. To keep the beam performance of the standard bunching system and reduce the construction cost as much as possible, the HAS is proposed by integrating the PB, the B and the standard TW accelerating structure together. The HAS can be widely applied in the industrial area to enhance the beam performance of the industrial linac but not increase the cost. In this paper, the design studies on an S-band (2856 MHz) HAS is presented. The HAS studied here is composed of 2 SW cells, 40 TW cells and 2 coupler cells. The on-axis electric field amplitude distribution simulated by HFSS can fully meet the beam dynamics requirement.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-SAP2017-MOPH27
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MOPH28	Design of a 1.3 GHz CW Room Temperature Buncher for the PAPS Project
	S. Shu Institute of High Energy Physics (IHEP), Chinese Academy of Sciences, Beijing, People's Republic of China X.P. Li, S. Pei IHEP, Beijing, People's Republic of China
	A 1.3 GHz CW room temperature buncher is located between the DC gun and the superconducting accelerator modules in the PAPS project. A brief beam dynamic study of the buncher system will be presented in this paper. According to the beam dynamic study, the effective cavity voltage should be more than 120 kV. The designed cavity has a unload Q of 23000 and a shunt impedance of 5.3 MΩ. 3-D electromagnetic simulation codes CST MWS and HFSS are used to optimize the inner dimensions of the buncher cavity. The multi-physics analysis is carried out to determine the cooling scheme and the mechanical sizes of the metal body. The RF coupler design and HOM analysis will also be presented in this paper.
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Paper

Title

Page

Primary Design of 4 a S-band Linac using Slotted Iris Structure for Hom Damping

76

J. Pang, S. Chen, X. He
CAEP/IFP, Mainyang, Sichuan, People's Republic of China
S. Pei, H. Shi, J.R. Zhang
IHEP, Beijing, People's Republic of China

A S-band LINAC with the operating frequency of 2856MHz and beam current of 4 A was designed for flash X-ray radiography for hydrodynamic test. The optimization of the parameters of the LINAC was processed to achieve the minimum beam radius and the proper energy efficiency. For the purpose of reducing the beam orbits offset at the exit of LINAC, a slotted iris accelerating structure would be employed to suppress the transverse Higher Order Modes (HOMs) by cutting four radial slots in the iris to couple the HOMs to SiC loads. In this paper, we present the design of the LINAC and the results of beam dynamic analysis.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-SAP2017-MOPH22

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MOPH23

Studies on the S-band Bunching System with the Hybrid Accelerating Structure

79

S. Pei, B. Gao
IHEP, Beijing, People's Republic of China

Funding: Supported by the National Natural Science Foundation of China (11475201) and the Youth Innovation Promotion Association of Chinese Academy of Sciences, China.
A standard bunching system is usually composed of a SW PB, a TW B and a standard accelerating structure. In the industrial area, the bunching system is usually simpli-fied by eliminating the PB and integrating the B and the standard accelerating structure together to form a β-varied accelerating structure. The bunching efficiency for this kind of simplified system is lower than that for the stand-ard one. The HB has been proved to be an innovative attempt to reduce the cost but preserve the beam quality as much as possible. Here, the HAS is proposed by inte-grating the PB, the B and the standard accelerating struc-ture together to exclusively simplify the standard bunch-ing system. Compared to the standard bunching system, the one with the HAS is more compact, and the cost is lowered to the largest extent without fairly degrading the beam performance. The proposed HAS can be widely applied in the industrial area.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-SAP2017-MOPH23

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MOPH26

CEPC Linac Design and Error Study

89

C. Meng, Y.L. Chi, X.P. Li, G. Pei, S. Pei, D. Wang, J.R. Zhang
IHEP, Beijing, People's Republic of China

Circular Electron-Positron Collider (CEPC) is a 100 km ring e⁺ e⁻ collider for a Higgs factory, including the double ring for collider and the injector. The injector is composed of the linac and booster. The linac of CEPC is a normal conducting S-band linac with frequency in 2856.75 MHz and provide electron and positron beam at an energy up to 10 GeV with bunch charge in 1.0 nC and repetition frequency in 100 Hz. The linac scheme will be detailed discussed. The beam dynamic results with short-range Wakefields and detailed error study including misalignment errors and field errors also be presented.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-SAP2017-MOPH26

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MOPH27

Design Studies on an S-band Hybrid Accelerating Structure

92

B. Gao, Y.L. Chi, S. Pei
IHEP, Beijing, People's Republic of China

Funding: Supported by the National Natural Science Foundation of China (11475201) and the Youth Innovation Promotion Association of Chinese Academy of Sciences, China.
In an electron linac, the composition of the bunching system is determined by the synthetical consideration of the beam performance and the construction cost. In the industrial area, the bunching system is usually simplified to reduce the construction cost by eliminating the PB and integrating the B and the standard accelerating structure to form the β-varied structure. The bunching performance for this kind of system is relatively worse than that for the standard one. To keep the beam performance of the standard bunching system and reduce the construction cost as much as possible, the HAS is proposed by integrating the PB, the B and the standard TW accelerating structure together. The HAS can be widely applied in the industrial area to enhance the beam performance of the industrial linac but not increase the cost. In this paper, the design studies on an S-band (2856 MHz) HAS is presented. The HAS studied here is composed of 2 SW cells, 40 TW cells and 2 coupler cells. The on-axis electric field amplitude distribution simulated by HFSS can fully meet the beam dynamics requirement.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-SAP2017-MOPH27

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MOPH28

Design of a 1.3 GHz CW Room Temperature Buncher for the PAPS Project

S. Shu
Institute of High Energy Physics (IHEP), Chinese Academy of Sciences, Beijing, People's Republic of China
X.P. Li, S. Pei
IHEP, Beijing, People's Republic of China

A 1.3 GHz CW room temperature buncher is located between the DC gun and the superconducting accelerator modules in the PAPS project. A brief beam dynamic study of the buncher system will be presented in this paper. According to the beam dynamic study, the effective cavity voltage should be more than 120 kV. The designed cavity has a unload Q of 23000 and a shunt impedance of 5.3 MΩ. 3-D electromagnetic simulation codes CST MWS and HFSS are used to optimize the inner dimensions of the buncher cavity. The multi-physics analysis is carried out to determine the cooling scheme and the mechanical sizes of the metal body. The RF coupler design and HOM analysis will also be presented in this paper.

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