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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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2.
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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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3.
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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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4.
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Benchmarking of Simulations of Coherent Beam-beam Instability with SuperKERKB Measurement
/ Ohmi, Kazuhito (KEK, Tsukuba) ; El Khechen, Dima (CERN) ; Hirosawa, Kouki (Sokendai, Tsukuba) ; Koiso, Haruyo (KEK, Tsukuba) ; Ohnishi, Yukiyoshi (KEK, Tsukuba)
Coherent beam-beam instability in head-tail mode has been predicted in collision with a large crossing angle. The instability is serious for design of future e⁺e⁻ colliders based on the large crossing angle collision. [...]
JACOW, 2019 - 3 p.
- Published in : 10.18429/JACoW-eeFACT2018-TUYBA01
Fulltext: PDF;
In : 62nd ICFA Advanced Beam Dynamics Workshop on High Luminosity Circular e+e− Colliders, Hong Kong, China, 24 - 27 Sep 2018, pp.TUYBA01
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5.
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Off-momentum Optics at SuperKEKB
/ Ohnishi, Yukiyoshi (KEK, Tsukuba) ; Koiso, Haruyo (KEK, Tsukuba) ; Morita, Akio (KEK, Tsukuba) ; Ohmi, Kazuhito (KEK, Tsukuba) ; Oide, Katsunobu (CERN) ; Sugimoto, Hiroshi (KEK, Tsukuba)
The nano-beam scheme can squeeze the vertical beta function at the IP much smaller than the bunch length. It implies that the large chromaticity is generated in the vicinity of the final focus quadrupole magnets and the strong sextupoles are adopted to correct the chromaticity, for instance the local chromaticity corrections. [...]
JACOW, 2019 - 5 p.
- Published in : 10.18429/JACoW-eeFACT2018-TUOBB02
Fulltext: PDF;
In : 62nd ICFA Advanced Beam Dynamics Workshop on High Luminosity Circular e+e− Colliders, Hong Kong, China, 24 - 27 Sep 2018, pp.TUOBB02
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6.
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Optics measurements and corrections at the early commissioning of SuperKEKB
/ Ohnishi, Y (KEK, Tsukuba, Kapan) ; Sugimoto, H (KEK, Tsukuba, Kapan) ; Morita, A (KEK, Tsukuba, Kapan) ; Koiso, H (KEK, Tsukuba, Kapan) ; Oide, K (KEK, Tsukuba, Kapan) ; Ohmi, K (KEK, Tsukuba, Kapan) ; Zhou, D (KEK, Tsukuba, Kapan) ; Funakoshi, Y (KEK, Tsukuba, Kapan) ; Carmignani, N (ESRF, Grenoble, France) ; Liuzzo, S M (ESRF, grenoble, France) et al.
We present experimental results of measurements and corrections for the optics at the early Phase-1 commissioning of SuperKEKB. The aim of SuperKEKB is a positron-electron collider built to achieve the target luminosity of 8x10^35 cm^−2s^−1. [...]
CERN-ACC-2017-0039.-
Geneva : CERN, 2017
- Published in : 10.18429/JACoW-IPAC2016-THPOR007
Fulltext: PDF;
In : 7th International Particle Accelerator Conference, Busan, Korea, 8 - 13 May 2016, pp.THPOR007
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7.
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Achievements of KEKB
/ Abe, Tetsuo (KEK, Tsukuba) ; Akai, Kazunori (KEK, Tsukuba) ; Akasaka, Norimasa (KEK, Tsukuba) ; Akemoto, Mitsuo (KEK, Tsukuba) ; Akiyama, Atsuyoshi (KEK, Tsukuba) ; Arinaga, Mitsuhiro (KEK, Tsukuba) ; Cai, Yunhai (SLAC) ; Ebihara, Kiyokazu (KEK, Tsukuba) ; Egawa, Kazumi (KEK, Tsukuba) ; Enomoto, Atsushi (KEK, Tsukuba) et al.
The machine commissioning of KEKB started in December 1998 and its operation was terminated at the end of June 2010 to upgrade KEKB to SuperKEKB. In this paper, we summarize the history of KEKB and show the achievements made there..
2013
- Published in : Prog. Theor. Exp. Phys. 2013 (2013) 03A001
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8.
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First Look at the Physics Case of TLEP
/ TLEP Design Study Working Group Collaboration
The discovery by the ATLAS and CMS experiments of a new boson with mass around 125 GeV and with measured properties compatible with those of a Standard-Model Higgs boson, coupled with the absence of discoveries of phenomena beyond the Standard Model at the TeV scale, has triggered interest in ideas for future Higgs factories. A new circular e+e- collider hosted in a 80 to 100 km tunnel, TLEP, is among the most attractive solutions proposed so far. [...]
arXiv:1308.6176.-
Geneva : CERN, 2014-01-29 - 49 p.
Article from SCOAP3: scoap3-fulltext - PDF; scoap - PDF; Fulltext: arXiv:1308.6176 - PDF; CERN-ACC-2016-006 - PDF; Springer Open Access article: PDF; External links: PDF on ECONF; Proceedings write-up on ECONF
In : Community Summer Study 2013 : Snowmass on the Mississippi, Minneapolis, MN, USA, 29 Jul - 6 Aug 2013, pp.164
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9.
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Study of vertical beam blowup in KEKB low energy ring
/ Fukuma, H (KEK, Tsukuba) ; Akai, K (KEK, Tsukuba) ; Akasaka, N (KEK, Tsukuba) ; Enomoto, A (KEK, Tsukuba) ; Flanagan, J W (KEK, Tsukuba) ; Funakoshi, Y (KEK, Tsukuba) ; Furukawa, K (KEK, Tsukuba) ; Hiramatsu, S (KEK, Tsukuba) ; Hosoyama, K (KEK, Tsukuba) ; Ieiri, T (KEK, Tsukuba) et al.
2001
Published version: PDF;
In : 18th International Conference on High-energy Accelerators, Tsukuba, Japan, 26 - 30 Mar 2001, pp.P1hlf10
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10.
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Belle II Technical Design Report
/ Abe, T ; Adachi, I ; Adamczyk, K ; Ahn, S ; Aihara, H ; Akai, K ; Aloi, M ; Andricek, L ; Aoki, K ; Arai, Y et al.
The Belle detector at the KEKB electron-positron collider has collected almost 1 billion Y(4S) events in its decade of operation. [...]
arXiv:1011.0352 ; KEK REPORT 2010-1.
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2010.
Preprint
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