IPAC2016 - List of Authors (Bai, S.)

Paper	Title	Page
TUPMW001	SPPC Parameter Choice and Lattice Design	1400
	F. Su Institute of High Energy Physics (IHEP), People's Republic of China S. Bai, T.J. Bian, Y.K. Chen, J. Gao, J.Y. Tang, D. Wang, Y. Wang IHEP, Beijing, People's Republic of China
	In this paper we showed a systematic method of appropriate parameter choice for a circular pp collider by using analytical expression of beam-beam tune shift limit started from given design goal and technical limitations. Based on parameters scan, we obtain a set of parameters for SPPC with different circumferences like 54km, 78km or 100km and different energies like 70TeV or 100TeV. We also showed the first version of SPPC lattice although it needs lots of work to do and to be optimized.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUPMW001
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THPOR009	Cepc Partial Double Ring Lattice Design	3785
	F. Su Institute of High Energy Physics (IHEP), People's Republic of China S. Bai, T.J. Bian, Z. Duan, J. Gao, H. Geng, D. Wang, Y. Wang, M. Xiao, G. Xu, Y. Zhang IHEP, Beijing, People's Republic of China
	In this paper, we introduced the layout and lattice design of Circular-Electron-Positron-Collider (CEPC) partial double ring (PDR) scheme. The baseline design of CEPC is a single beam-pipe electron positron collider, which has to adopt pretzel orbit scheme. And it is not suitable to serve as a high luminosity Z factory. If we choose partial double ring scheme, we can get a higher luminosity with lower power and be suitable to serve as a high luminosity Z factory. In this paper, we discussed the details of CEPC partial double ring lattice design and showed the dynamic aperture study and optimization.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPOR009
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THPOR010	CEPC Parameter Choice and Partial Double Ring Design	3788
	D. Wang, S. Bai, T.J. Bian, X. Cui, Z. Duan, J. Gao, H. Geng, Y.Y. Guo, Q. Qin, N. Wang, Y. Wang, M. Xiao, J.Y. Zhai, C. Zhang, Y. Zhang IHEP, Beijing, People's Republic of China W. Chou Fermilab, Batavia, Illinois, USA F. Su Institute of High Energy Physics (IHEP), People's Republic of China
	Funding: Work supported by the National Foundation of Natural Sciences (11505198 and 11575218) In order to avoid the pretzel orbit, CEPC is proposed to use partial double ring scheme in CDR. Based on crab waist scheme, we hope to either increase the luminosity with same beam power as Pre-CDR, or reduce the beam power while keeping the same luminosity in Pre-CDR. FFS with crab sextupoles has been developed and the arc lattice was redesigned to acheive the lower emittance for crab waist scheme.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPOR010
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THPOR011	Design study of CEPC Alternating Magnetic Field Booster	3791
	T.J. Bian, S. Bai, X. Cui, J. Gao, D. Wang, Y. Wang, M. Xiao, C. Zhang IHEP, Beijing, People's Republic of China Y. Cai SLAC, Menlo Park, California, USA M. Koratzinos DPNC, Genève, Switzerland F. Su Institute of High Energy Physics (IHEP), People's Republic of China
	CEPC is next generation circular collider proposed by China. The design of the full energy booster ring of the CEPC is especially challenging. The ejected beam energy is 120GeV but the injected beam only 6GeV. In a conventional approach, the low magnetic field of the main dipole magnets creates problems. We propose to operate the booster ring as a large wiggler at low beam energies and as a normal ring at high energies to avoid the problem of very low dipole magnet fields.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPOR011
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THPOR012	Dynamic Aperture Study of the CEPC Main Ring with Interaction Region	3795
	Y. Wang, S. Bai, T.J. Bian, J. Gao, H. Geng, D. Wang, Y. Zhang IHEP, Beijing, People's Republic of China F. Su Institute of High Energy Physics (IHEP), People's Republic of China
	CEPC is a Circular Electron and Positron Collider proposed by China to mainly study the Higgs boson. In order to achieve factory luminosity, a strong focusing system and low-emittance are required. A momentum acceptance as large as 2\% is also required to get a reasonable beam lifetime. This is one of the key issues of the CEPC accelerator physics. In this paper, the optics design of the interaction region and the optimization of dynamic aperture for the whole ring (single ring scheme) will be presented.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPOR012
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THPOR013	Magnet Error Effect on Dynamic Aperture in CEPC	3798
	S. Bai, J. Gao, Y. Wang, D.J. Xiao IHEP, Beijing, People's Republic of China
	With the discovery of the higgs boson at around 125GeV, a circular higgs factory design with high luminosity (L ~ 1034 cm^-2s⁻¹) is becoming more popular in the accelerator world. The CEPC project in China is one of them. The performance of the machine can be influenced by the existence of every kind of inaccuracies of the magnets, such as misalignment errors and field errors, multipole errors etc on. In this paper, we reported the errors that used in the CEPC beam dynamic study, and the influence on dynamic aperture of the CEPC main ring when introducing these kinds of errors.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPOR013
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THPOR014	MDI Design in CEPC Partial Double Ring	3802
	S. Bai, J. Gao, Y. Wang, Q.L. Xiu, W.C. Yao, Y. Yue IHEP, Beijing, People's Republic of China
	With the discovery of the higgs boson at around 125GeV, a circular higgs factory design with high luminosity (L ~ 10³⁴ cm^-2 s^-1) is becoming more popular in the accelerator world. The CEPC project in China is one of them. Machine Detector Interface (MDI) is the key research area in electron-positron colliders, especially in CEPC, it is one of the criteria to measure the accelerator and detector design performance. Detector background, collimator and solenoid compensation are the most critical physics problem. Beamstrahlung is the problem which is never gotten into before in the existed electron positron collider of world history. Every kinds of background are bad for detector, and solenoid can make damage to accelerator beam. We will use a Monte Carlo simulation method to calculate and analysis the CEPC detector background and the harm it makes to detector. Anti-solenoid are designed to compensate the strong detector solenoid field of several tesla.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPOR014
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THPOR017	Dynamic Aperture Optimization at CEPC with Pretzel Orbit	3808
	H. Geng, S. Bai, X. Cui, Z. Duan, J. Gao, Y.Y. Guo, Y.M. Peng, Q. Qin, D. Wang, N. Wang, Y. Wang, G. Xu, Y. Yue, Y. Zhang IHEP, Beijing, People's Republic of China W. Chou Fermilab, Batavia, Illinois, USA F. Su Institute of High Energy Physics (IHEP), People's Republic of China
	A preliminary design of the CEPC ring with pretzel orbit will be presented. The ring and pretzel orbit will be designed for 50 bunches, as required in the CEPC Pre-CDR. The linear optics, as well as the non-linear chromaticity compensation with the presence of pretzel orbit will be described. Different phase advance difference between the long and short straight sections, have been tried to optimize the dynamic aperture, the results will be shown in this paper.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPOR017
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Paper

Title

Page

SPPC Parameter Choice and Lattice Design

1400

F. Su
Institute of High Energy Physics (IHEP), People's Republic of China
S. Bai, T.J. Bian, Y.K. Chen, J. Gao, J.Y. Tang, D. Wang, Y. Wang
IHEP, Beijing, People's Republic of China

In this paper we showed a systematic method of appropriate parameter choice for a circular pp collider by using analytical expression of beam-beam tune shift limit started from given design goal and technical limitations. Based on parameters scan, we obtain a set of parameters for SPPC with different circumferences like 54km, 78km or 100km and different energies like 70TeV or 100TeV. We also showed the first version of SPPC lattice although it needs lots of work to do and to be optimized.

DOI •

reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUPMW001

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THPOR009

Cepc Partial Double Ring Lattice Design

3785

F. Su
Institute of High Energy Physics (IHEP), People's Republic of China
S. Bai, T.J. Bian, Z. Duan, J. Gao, H. Geng, D. Wang, Y. Wang, M. Xiao, G. Xu, Y. Zhang
IHEP, Beijing, People's Republic of China

In this paper, we introduced the layout and lattice design of Circular-Electron-Positron-Collider (CEPC) partial double ring (PDR) scheme. The baseline design of CEPC is a single beam-pipe electron positron collider, which has to adopt pretzel orbit scheme. And it is not suitable to serve as a high luminosity Z factory. If we choose partial double ring scheme, we can get a higher luminosity with lower power and be suitable to serve as a high luminosity Z factory. In this paper, we discussed the details of CEPC partial double ring lattice design and showed the dynamic aperture study and optimization.

DOI •

reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPOR009

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THPOR010

CEPC Parameter Choice and Partial Double Ring Design

3788

D. Wang, S. Bai, T.J. Bian, X. Cui, Z. Duan, J. Gao, H. Geng, Y.Y. Guo, Q. Qin, N. Wang, Y. Wang, M. Xiao, J.Y. Zhai, C. Zhang, Y. Zhang
IHEP, Beijing, People's Republic of China
W. Chou
Fermilab, Batavia, Illinois, USA
F. Su
Institute of High Energy Physics (IHEP), People's Republic of China

Funding: Work supported by the National Foundation of Natural Sciences (11505198 and 11575218)
In order to avoid the pretzel orbit, CEPC is proposed to use partial double ring scheme in CDR. Based on crab waist scheme, we hope to either increase the luminosity with same beam power as Pre-CDR, or reduce the beam power while keeping the same luminosity in Pre-CDR. FFS with crab sextupoles has been developed and the arc lattice was redesigned to acheive the lower emittance for crab waist scheme.

DOI •

reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPOR010

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THPOR011

Design study of CEPC Alternating Magnetic Field Booster

3791

T.J. Bian, S. Bai, X. Cui, J. Gao, D. Wang, Y. Wang, M. Xiao, C. Zhang
IHEP, Beijing, People's Republic of China
Y. Cai
SLAC, Menlo Park, California, USA
M. Koratzinos
DPNC, Genève, Switzerland
F. Su
Institute of High Energy Physics (IHEP), People's Republic of China

CEPC is next generation circular collider proposed by China. The design of the full energy booster ring of the CEPC is especially challenging. The ejected beam energy is 120GeV but the injected beam only 6GeV. In a conventional approach, the low magnetic field of the main dipole magnets creates problems. We propose to operate the booster ring as a large wiggler at low beam energies and as a normal ring at high energies to avoid the problem of very low dipole magnet fields.

DOI •

reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPOR011

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THPOR012

Dynamic Aperture Study of the CEPC Main Ring with Interaction Region

3795

Y. Wang, S. Bai, T.J. Bian, J. Gao, H. Geng, D. Wang, Y. Zhang
IHEP, Beijing, People's Republic of China
F. Su
Institute of High Energy Physics (IHEP), People's Republic of China

CEPC is a Circular Electron and Positron Collider proposed by China to mainly study the Higgs boson. In order to achieve factory luminosity, a strong focusing system and low-emittance are required. A momentum acceptance as large as 2\% is also required to get a reasonable beam lifetime. This is one of the key issues of the CEPC accelerator physics. In this paper, the optics design of the interaction region and the optimization of dynamic aperture for the whole ring (single ring scheme) will be presented.

DOI •

reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPOR012

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THPOR013

Magnet Error Effect on Dynamic Aperture in CEPC

3798

S. Bai, J. Gao, Y. Wang, D.J. Xiao
IHEP, Beijing, People's Republic of China

With the discovery of the higgs boson at around 125GeV, a circular higgs factory design with high luminosity (L ~ 1034 cm^-2s⁻¹) is becoming more popular in the accelerator world. The CEPC project in China is one of them. The performance of the machine can be influenced by the existence of every kind of inaccuracies of the magnets, such as misalignment errors and field errors, multipole errors etc on. In this paper, we reported the errors that used in the CEPC beam dynamic study, and the influence on dynamic aperture of the CEPC main ring when introducing these kinds of errors.

DOI •

reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPOR013

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THPOR014

MDI Design in CEPC Partial Double Ring

3802

S. Bai, J. Gao, Y. Wang, Q.L. Xiu, W.C. Yao, Y. Yue
IHEP, Beijing, People's Republic of China

With the discovery of the higgs boson at around 125GeV, a circular higgs factory design with high luminosity (L ~ 10³⁴ cm^-2 s^-1) is becoming more popular in the accelerator world. The CEPC project in China is one of them. Machine Detector Interface (MDI) is the key research area in electron-positron colliders, especially in CEPC, it is one of the criteria to measure the accelerator and detector design performance. Detector background, collimator and solenoid compensation are the most critical physics problem. Beamstrahlung is the problem which is never gotten into before in the existed electron positron collider of world history. Every kinds of background are bad for detector, and solenoid can make damage to accelerator beam. We will use a Monte Carlo simulation method to calculate and analysis the CEPC detector background and the harm it makes to detector. Anti-solenoid are designed to compensate the strong detector solenoid field of several tesla.

DOI •

reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPOR014

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THPOR017

Dynamic Aperture Optimization at CEPC with Pretzel Orbit

3808

H. Geng, S. Bai, X. Cui, Z. Duan, J. Gao, Y.Y. Guo, Y.M. Peng, Q. Qin, D. Wang, N. Wang, Y. Wang, G. Xu, Y. Yue, Y. Zhang
IHEP, Beijing, People's Republic of China
W. Chou
Fermilab, Batavia, Illinois, USA
F. Su
Institute of High Energy Physics (IHEP), People's Republic of China

A preliminary design of the CEPC ring with pretzel orbit will be presented. The ring and pretzel orbit will be designed for 50 bunches, as required in the CEPC Pre-CDR. The linear optics, as well as the non-linear chromaticity compensation with the presence of pretzel orbit will be described. Different phase advance difference between the long and short straight sections, have been tried to optimize the dynamic aperture, the results will be shown in this paper.

DOI •

reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPOR017

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