| Paper | Title | Other Keywords | Page |
|---|---|---|---|
| TUYAA04 | Study to Mitigate Electron Cloud Effect in SuperKEKB | electron, MMI, photon, simulation | 95 |
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| During Phase-1 commissioning of the SuperKEKB from February to June 2016, electron cloud effects (ECE) were observed in the positron ring. The electron clouds were considered to exist in the beam pipes in the drift spaces of the ring, where the beam pipes have antechambers and titanium nitride (TiN) coating as countermeasures against ECE. Following this, permanent magnets and solenoids were attached to the beam pipes as additional countermeasures. Consequently, during Phase-2 commissioning from March to July 2018, experiments showed that the threshold beam current for exciting ECE increased by a factor of at least two relative to that during Phase-1 commissioning. While the countermeasures were strengthened, the effectiveness of the antechambers and TiN film coating was re-evaluated. From various simulations and experiments during Phase-2 commissioning, the antechamber was found to be less effective than expected with regard to reducing the number of photoelectrons in the beam channel. The TiN film coating, on the other hand, was considered to have a low secondary electron yield as expected. | |||
| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-eeFACT2018-TUYAA04 | ||
| About • | paper received ※ 27 September 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, acceleration, booster, positron | 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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| WEXBA05 | Machine Detector Interface for CEPC | detector, photon, scattering, background | 217 |
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| The Circular Electron Positron Collider (CEPC) is a proposed Higgs factory with center of mass energy of 240 GeV to measure the properties of Higgs boson and test the standard model accurately. 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. In this paper, we will introduce the CEPC superconducting magnets design, solenoid compensation, synchrotron radiation and mask design, detector background, collimator, mechanics assembly etc on, which are the most critical physics problem. | |||
| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-eeFACT2018-WEXBA05 | ||
| About • | paper received ※ 29 September 2018 paper accepted ※ 19 February 2019 issue date ※ 21 April 2019 | ||
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| WEOBB02 | CEPC Superconducting Magnets | quadrupole, detector, interaction-region, sextupole | 241 |
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Funding: This work was supported in part by the Yifang Wang scientific Studio of the Ten Thousand Talents Project and in part by the National Natural Science Foundation of China under Grant 11875272. A Circular Electron Positron Collider (CEPC) with a circumference about 100 km, a beam energy up to 120 GeV is proposed to be constructed in China. CEPC will be a double ring collider with two interaction points. Most magnets for CEPC accelerator are conventional magnets, but some superconducting magnets are needed in the interaction region. Final focus superconducting high gradient quadrupoles are inside the solenoid field of Detector magnet, so superconducting anti-solenoid is need to minimize the effect of the solenoid field on the beam. In addition, high strength superconducting sextupole magnets are also required. In this paper, the layout and conceptual design of CEPC Interaction Region superconducting magnets are described, and the R&D plan is presented. |
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| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-eeFACT2018-WEOBB02 | ||
| About • | paper received ※ 23 September 2018 paper accepted ※ 19 February 2019 issue date ※ 21 April 2019 | ||
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