| Paper | Title | Other Keywords | Page |
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| MOXBA01 | Challenges for Circular e+e− Colliders | collider, electron, operation, luminosity | 7 |
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Funding: This work was supported by the European Commission under the HORIZON 2020 project ARIES no.~730871. This paper sketches the glorious past and the tantalizing future of circular e+e− colliders, highlighting some of the key issues. |
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| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-eeFACT2018-MOXBA01 | ||
| About • | paper received ※ 13 October 2018 paper accepted ※ 19 February 2019 issue date ※ 21 April 2019 | ||
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| MOYBA01 | Round Colliding Beams at Vepp-2000 with Extreme Tuneshifts | luminosity, collider, electron, emittance | 34 |
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| VEPP-2000 is the only electron-positron collider operating with round beams that allow to enhance beam-beam limit. VEPP-2000 with SND and CMD-3 detectors carried out two successful data-taking runs after new BINP injection complex was commissioned. The 2016/2017 run was dedicated to high energy range (640-1000 MeV per beam) while the 2017/2018 run was focused at 275-600 MeV/beam energies. With sufficient positron production rate and upgraded full-energy booster the collider luminosity was limited by beam-beam effects, namely flip-flop effect. Thorough machine tuning together with new ideas introduced to suppress flip-flop allowed to achieve high beam-beam tuneshift and bunch-by-bunch luminosity values at specific beam energies. The achieved luminosity increased 2-5 times in a whole energy range in comparison to phase-1 operation (2010-2013). | |||
| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-eeFACT2018-MOYBA01 | ||
| About • | paper received ※ 11 October 2018 paper accepted ※ 19 February 2019 issue date ※ 21 April 2019 | ||
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| MOYBA04 | Report from ARIES Muon Collider Workshop in Padua | collider, factory, target, emittance | 41 |
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Funding: This work was supported by the European Commission under the HORIZON 2020 project ARIES no.~730871. Several novel concepts could help the muon collider become a reality. These concepts include parametric ionization cooling, low-emittance muon production by positron annihilation (LEMMA scheme), production of low-emittance muon or positron beams using the Gamma Factory concept, and strategies to upgrade large accelerator complexes, like the LHC or the FCC, into a highest-energy muon collider. The muon collider workshop organized by ARIES APEC at Padua in July 2018 gathered the international community in order to review the recent progress and to formulate a common R\&D strategy. Several important conclusions and recommendations were drawn. |
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| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-eeFACT2018-MOYBA04 | ||
| About • | paper received ※ 13 October 2018 paper accepted ※ 19 February 2019 issue date ※ 21 April 2019 | ||
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| TUOBB03 | Progress of Preliminary Work for the Accelerators of a 2-7GeV Super Tau Charm Facility at China | collider, factory, electron, luminosity | 76 |
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Funding: Work supported by National Natural Science Foundation of China U1832169 and the Fundamental Research Funds for the Central Univer-sities, Grant No WK2310000046 As the most successful tau-charm factory of the world, BEPC II will celebrate its 10th birthday this year and will finish its historical mission in the next decade. Because of its very important role in high energy phys-ics study, BEPC II will certainly need a successor, a new tau-charm collider. This paper discusses the feasi-bility of a greenfield next generation tau-charm collid-er named HIEPA. The luminosity of this successor is about 5×1034 cm−2s−1 pilot and 1×1035cm-2s−1 nominal, with the electron beam longitudinally polarized at the IP. The general scheme of the accelerators and the beam parameters are shown. Several key technologies such as beam polarization and beam emittance diag-nostics are also discussed. |
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| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-eeFACT2018-TUOBB03 | ||
| About • | paper received ※ 16 October 2018 paper accepted ※ 19 February 2019 issue date ※ 21 April 2019 | ||
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| TUPAB02 | Low Emittance Beam Transport for e−/e+ LINAC | emittance, linac, electron, gun | 126 |
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| Design luminosity of SuperKEKB is 8 x 1035 cm-2s-1, which is 40 times higher than that of KEKB achieved. To achieve the design luminosity, the beam have to be transported to the SuperKEKB main ring with the high bunch charge (4 nC) and low emittance: 40/20 um for horizontal/vertical electron beam emittance and 100/15 um for positron beam emittance in Phase 3 final. In the LINAC and the beam transport line, the emittance growth is mainly induced by residual dispersion, beam phase space jitter, wakefield in acceleration structure, and radiation excitation. In the Phase 2 operation, we have evaluated and, if possible, corrected these effects on the emittance. Results of the emittance measurement is described. | |||
| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-eeFACT2018-TUPAB02 | ||
| About • | paper received ※ 19 October 2018 paper accepted ※ 19 February 2019 issue date ※ 21 April 2019 | ||
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| TUPAB04 | Overall Design of the CEPC Injector LINAC | linac, electron, emittance, damping | 139 |
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| The CEPC injector consists of linac and booster. To meet the requirement of the booster, the linac should provide 10 GeV electron and positron beam at a repetition frequency of 100 Hz. In this paper, the overall design of the linac has introduced. For the linac one-bunch-per-pulse is adopted and bunch charge should be larger than 3 nC in the design. A 1.1 GeV damping ring with 75.4 m circumference has adopted to reduce the transverse emittance of positron beam to suitably small value. | |||
| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-eeFACT2018-TUPAB04 | ||
| About • | paper received ※ 26 September 2018 paper accepted ※ 19 February 2019 issue date ※ 21 April 2019 | ||
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| TUPAB07 | Commissioning of Positron Damping Ring and the Beam Transport for SuperKEKB | emittance, linac, MMI, operation | 152 |
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| The Positron Damping Ring (DR) for SuperKEKB successfully started its operation in February 2018, and the commissioning was continued until the end of SuperKEKB Phase 2 in July without serious troubles. This paper describes achievements of the beam commissioning of injection and extraction lines (LTR and RTL) between the LINAC and DR. In the LTR commissioning, the positron beam with high emittance, wide energy spread, and high charge were transported and injected into the DR. In the RTL commissioning, special cares were necessary to preserve the low emittance. The observed emittance growth in the RTL was not a problem for Phase 2, but it should be resolved in the coming Phase 3. In this paper, brief results of the commissioning of the DR is also reported. | |||
| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-eeFACT2018-TUPAB07 | ||
| About • | paper received ※ 20 October 2018 paper accepted ※ 19 February 2019 issue date ※ 21 April 2019 | ||
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| WEXAA04 | Ideas for Longitudinal Polarization at the Z/W/H/top Factory | polarization, solenoid, acceleration, booster | 190 |
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| Different schemes for getting the longitudinal polarization at FCC-ee are considered. Depolarization rates for rings with spin rotators are evaluated and methods of acceleration of polarized beams in a booster synchrotron are proposed. | |||
| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-eeFACT2018-WEXAA04 | ||
| About • | paper received ※ 10 October 2018 paper accepted ※ 19 February 2019 issue date ※ 21 April 2019 | ||
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