Paper | Title | Page |
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TUYA01 | BEPCII Performance and Beam Dynamics Studies on Luminosity | 1014 |
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The upgrade of the Beijing Electron Positron Collider, BEPCII, is now in a good performance for both high energy physics and synchrotron radiation experiments. The luminosity at the design energy of 1.89 GeV reached the design value 1.0*1033/cm2/s1 recently. A lot of work, including accelerator physics study and technical progress, has been done for the luminosity enhancement, not only at the design energy, but all the energy region run for HEP experiments from 1.0 to 2.3 GeV. The performance of BEPCII and the process of luminosity enhancement will be described in detail. | ||
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Slides TUYA01 [5.801 MB] | |
DOI • | reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUYA01 | |
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WEPOW026 | Recent Physical Studies for the HEPS Project | 2886 |
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The High Energy Photon Source (HEPS), a kilometre- scale storage ring light source, with a beam energy of 5 to 6 GeV and transverse emittances of a few tens of pm.rad, is to be built in Beijing and now is under design. In this paper we reported the progress and status of the physical studies for the HEPS project, covering issues of storage lattice design and optimization, booster design, injection design, collective effects, error study, insertion device effects, longitudinal dynamics, etc. | ||
DOI • | reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPOW026 | |
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THOBA02 | Space Charge Induced Collective Modes and Beam Halo in Periodic Channels | 3165 |
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Funding: This work is supported by the Ministry of Science and Technology of China under Grant No. 2014CB845501. The collective mode instabilities of periodically focused high intensity beams based on the Vlasov-Poisson equation are investigated both analytically and numerically. It is found that the broadened collective stop bands resulting from space charge induced structure resonance in long periodic channels predict well the areas where the rms emittance growth accompanied with n-fold phase space structure (beam halo) would take place. We believe that the formed beam halo, which is depicted in action-angle frame, could be understood as a side-effect of the collective beam mode. |
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Slides THOBA02 [4.704 MB] | |
DOI • | reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THOBA02 | |
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THPOR010 | CEPC Parameter Choice and Partial Double Ring Design | 3788 |
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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. |
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DOI • | reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPOR010 | |
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THPOR017 | Dynamic Aperture Optimization at CEPC with Pretzel Orbit | 3808 |
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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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