Author: Gao, J.
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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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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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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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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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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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THPOR028 Numerical Analysis of Stresses for the Target of the ILC 300 Hz Conventional Positron Source 3838
 
  • S. Jin, J. Gao
    IHEP, Beijing, People's Republic of China
  • T. Omori
    KEK, Ibaraki, Japan
  • P. Sievers
    CERN, Geneva, Switzerland
  
  A 300Hz conventional, e- driven positron source for the ILC is proposed by an international team. In this paper, we focus on numerical analysis of dynamic stresses in the Tungsten target. These are driven by the pulsed e-beam, which causes rapid heating and subsequent, dynamic loads in the target which can lead to fracture and failure of it. A program of ANSYS workbench is used in the study. The dynamic stresses from both of extremely short (10 ns) and nominal (1μs) thermal pulses are systematically studied in various target related parts such as small spheres, cylinders. Particular attention has also been paid to the buckling of foils.
(*) The first proposal was published in NIMA 672 (2012) 52-56 by
T. Omori, et. al.. The authors come from seven institutes including KEK, Hiroshima U., DESY, ANL, IHEP, SOKENDAI, U. of Hamburg 		 
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPOR028  
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THPOR045 Analytical Estimation of ATF Beam Halo Distribution 3888
 
  • D. Wang, J. Gao
    IHEP, Beijing, People's Republic of China
  • P. Bambade
    LAL, Orsay, France
  • T. Naito
    KEK, Ibaraki, Japan
  
  Funding: Work supported by the National Foundation of Natural Sciences (11505198 and 11575218)
Halo distribution is a key topic for background study. This paper has developed an analytical method to give an estimation of ATF beam halo distribution. The equilibrium particle distribution of the beam tail in the ATF damping ring is calculated analytically with different emittance and different vacuum degree. The analytical results agree the measurements very well. This is a general method which can be applied to any electron rings. 		 
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPOR045  
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