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Selected advances in the accelerator design of the Future Circular Electron-Positron Collider (FCC-ee)
/ FCC Collaboration
In autumn 2023, the FCC Feasibility Study underwent a crucial “mid-term review”. We describe some accelerator performance risks for the proposed future circular electron-positron collider, FCC-ee, identified for, and during, the mid-term review. [...]
FERMILAB-CONF-24-0659-AD-PIP2.-
2024 - 4 p.
- Published in : JACoW IPAC 2024 (2024) WEPR14
Fulltext: PDF;
In : 15th International Particle Accelerator Conference (IPAC 2024), Nashville, TN, United States, 19 - 24 May 2024, pp.WEPR14
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CEPC Technical Design Report: Accelerator
/ CEPC Study Group Collaboration
The Circular Electron Positron Collider (CEPC) is a large scientific project initiated and hosted by China, fostered through extensive collaboration with international partners. The complex comprises four accelerators: a 30 GeV Linac, a 1.1 GeV Damping Ring, a Booster capable of achieving energies up to 180 GeV, and a Collider operating at varying energy modes (Z, W, H, and ttbar). [...]
arXiv:2312.14363; IHEP-CEPC-DR-2023-01; IHEP-AC-2023-01.-
2024-06-03 - 1106 p.
- Published in : Radiat. Detect. Technol. Methods 8 (2024) 1-1105
Fulltext: 2312.14363 - PDF; Publication - PDF;
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The SuperKEKB Has Broken the World Record of the Luminosity
/ Funakoshi, Yoshihiro (KEK, Tsukuba) ; Abe, Tetsuo (KEK, Tsukuba) ; Akai, Kazunori (KEK, Tsukuba) ; Arimoto, Yasushi (KEK, Tsukuba) ; Egawa, Kazumi (KEK, Tsukuba) ; Enomoto, Shun (KEK, Tsukuba) ; Fukuma, Hitoshi (KEK, Tsukuba) ; Furukawa, Kazuro (KEK, Tsukuba) ; Iida, Naoko (KEK, Tsukuba) ; Ikeda, Hitomi (KEK, Tsukuba) et al.
The SuperKEKB broke the world record of the luminosity in June 2020 in the Phase 3 operation. The luminosity has been increasing since then and the present highest luminosity is 4.65 x 10³⁴ cm⁻²s⁻¹ with β_{y}^{*} of 1 mm. [...]
2022 - 5 p.
- Published in : JACoW IPAC 2022 (2022) 1-5
Fulltext: PDF;
In : 13th International Particle Accelerator Conference (IPAC 2022), Bangkok, Thailand, 12 - 17 Jun 2022, pp.1-5
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Impact of Bunch Current on Optics Measurements in SuperKEKB
/ Keintzel, Jacqueline (CERN ; TU Vienna) ; Ishibashi, Takuya (KEK, Tsukuba) ; Koiso, Haruyo (KEK, Tsukuba) ; Mitsuka, Gaku (KEK, Tsukuba) ; Morita, Akio (KEK, Tsukuba) ; Ohmi, Kazuhito (KEK, Tsukuba) ; Ohnishi, Yukiyoshi (KEK, Tsukuba) ; Sugimoto, Hiroshi (KEK, Tsukuba) ; Terui, Shinji (KEK, Tsukuba) ; Tobiyama, Makoto (KEK, Tsukuba) et al.
SuperKEKB has recently achieved the world record instantaneous luminosity of 2.8 × 10³⁴ \si{cm⁻²s⁻¹} and aims at reaching a target luminosity of about 6 × 10³⁵ \si{cm⁻²s⁻¹}. To accomplish this goal it is planned to increase beam currents up to §I{3.6}{A} and §I{2.6}{A} for the positron and the electron ring, respectively. [...]
Geneva : JACoW, 2021 - 4 p.
- Published in : JACoW IPAC 2021 (2021) 1356-1359
Fulltext: PDF;
In : 12th International Particle Accelerator Conference (IPAC 2021), Online, 24 - 28 May 2021, pp.1356-1359
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SuperKEKB Optics Measurements Using Turn-by-Turn Beam Position Data
/ Keintzel, Jacqueline (CERN ; TU Vienna) ; Koiso, Haruyo (KEK, Tsukuba) ; Mitsuka, Gaku (KEK, Tsukuba) ; Morita, Akio (KEK, Tsukuba) ; Ohmi, Kazuhito (KEK, Tsukuba) ; Ohnishi, Yukiyoshi (KEK, Tsukuba) ; Sugimoto, Hiroshi (KEK, Tsukuba) ; Tobiyama, Makoto (KEK, Tsukuba) ; Tomás García, Rogelio (CERN) ; Yang, Renjun (KEK, Tsukuba)
SuperKEKB, an asymmetric electron-positron collider, has recently achieved the world record instantaneous luminosity of 2.8 × 10³⁴ \si{cm⁻²s⁻¹} using crab-waist collision scheme. In order to reach the design value of 6×10³⁵ \si{cm⁻²s⁻¹} a vertical beta function at the interaction point of §I{0.3}{mm} is required, demanding unprecedented optics control. [...]
Geneva : JACoW, 2021 - 4 p.
- Published in : JACoW IPAC 2021 (2021) 1352-1355
Fulltext: PDF;
In : 12th International Particle Accelerator Conference (IPAC 2021), Online, 24 - 28 May 2021, pp.1352-1355
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Mitigation of Electron Cloud Effects in the FCC-ee Collider
/ Yaman, Fatih (Izmir Inst. Tech.) ; Iadarola, Giovanni (CERN) ; Kersevan, Roberto (CERN) ; Ogur, Salim (IJCLab, Orsay) ; Ohmi, Kazuhito (KEK, Tsukuba) ; Zimmermann, Frank (CERN) ; Zobov, Mikhail (Frascati)
Electron clouds forming inside the beam vacuum chamber due to photoemission and secondary emission may limit the accelerator performance. Specifically, the electron clouds can blow up the vertical emittance of a positron beam, through a head-tail-type single-bunch instability, if the central electron density exceeds a certain threshold value, that can be estimated analytically. [...]
arXiv:2203.04872.-
2022-08-17 - 11 p.
- Published in : EPJ Tech. Instrum. 9 (2022) 9
Fulltext: 2203.04872 - PDF; document - PDF;
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Mitigation of coherent beam instabilities in CEPC
/ Wang, Na (Beijing, Inst. High Energy Phys.) ; Zhang, Yuan (Beijing, Inst. High Energy Phys. ; Beijing, GUCAS) ; Liu, Yudong (Beijing, Inst. High Energy Phys.) ; Tian, Saike (Beijing, Inst. High Energy Phys.) ; Ohmi, Kazuhito (KEK, Tsukuba) ; Lin, Chuntao (Beijing, Inst. High Energy Phys. ; KEK, Tsukuba)
The collective beam instabilities are potential restrictions in the Circular Electron Positron Collider (CEPC) to achieve high luminosity performance. These instabilities can induce beam quality degradation or beam losses. [...]
2020 - 5 p.
- Published in : 10.23732/CYRCP-2020-009.286
Fulltext: PDF;
In : ICFA mini-Workshop on Mitigation of Coherent Beam Instabilities in Particle Accelerators (MCBI 2019), Zermatt, Switzerland, 23 - 27 Sep 2019, pp.286-290 (CERN-2020-009)
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ebook
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Electron cloud effects in SuperKEKB commissioning
/ Ohmi, K (KEK, Tsukuba ; Sokendai, Tsukuba) ; Flanagan, J (KEK, Tsukuba ; Sokendai, Tsukuba) ; Fukuma, H (KEK, Tsukuba ; Sokendai, Tsukuba) ; Ikeda, H (KEK, Tsukuba ; Sokendai, Tsukuba) ; Mulyani, E (KEK, Tsukuba ; Sokendai, Tsukuba) ; Shibata, K (KEK, Tsukuba ; Sokendai, Tsukuba) ; Suetsugu, Y (KEK, Tsukuba ; Sokendai, Tsukuba) ; Tobiyama, M (KEK, Tsukuba ; Sokendai, Tsukuba)
A vertical emittance growth (beam size blow-up) due to electron cloud has been observed in the positron low energy ring (LER) in Phase-I commissioning (2016) of SuperKEKB. The emittance growth is caused by fast head-tail instability due to wake force induced by electron cloud. [...]
2020 - 4 p.
Fulltext from publisher: PDF;
In : ECLOUD’18: Proceedings of the Joint INFN-CERN-ARIES Workshop on Electron-Cloud Effects, La Biodola, Isola d'Elba, Italy, 3 - 7 Jun 2018, pp.179-182 (CERN-2020-007)
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