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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WEOAA02 | On-axis Beam Accumulation Enabled by Phase Adjustment of a Double-frequency RF System for Diffraction-limited Storage Rings | 2032 |
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Funding: Work supported by NSFC (Y4113G005C) Future synchrotron light sources aim to achieve ultra- low emittances on both transverse planes, approaching or even reaching the diffraction limit of X-ray photon energies. These diffraction-limited storage rings (DLSRs) feature very strong lattice nonlinearities and thus very small dynamic aperture, which exclude off-axis injection schemes. In this paper, we propose a longitudinal on-axis injection scheme, which is based on a double-frequency RF system and in- dependently adjustment of the RF phase of each cavity to enable RF gymnastics. Such a scheme looks feasible with the state-of-art technology of fast injection kicker. Compari- son with other on-axis injection schemes is also discussed. |
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Slides WEOAA02 [1.712 MB] | |
DOI • | reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEOAA02 | |
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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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THPOR009 | Cepc Partial Double Ring Lattice Design | 3785 |
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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 |
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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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