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1.
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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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Development of 2-m model magnet of the beam separation dipole with new iron cross section for the High-Luminosity LHC upgrade
/ Sugano, Michinaka (KEK, Tsukuba) ; Enomoto, Shun (KEK, Tsukuba) ; Higashi, Norio (KEK, Tsukuba) ; Iida, Masahisa (KEK, Tsukuba) ; Ikemoto, Yukiko (KEK, Tsukuba) ; Kawamata, Hiroshi (KEK, Tsukuba) ; Kimura, Nobuhiro (KEK, Tsukuba) ; Nakamoto, Tatsushi (KEK, Tsukuba) ; Ogitsu, Toru (KEK, Tsukuba) ; Ohhata, Hirokatsu (KEK, Tsukuba) et al.
Large aperture beam separation dipoles (D1 magnet) must be developed for the interaction regions in the high-luminosity large hadron collider (HL-LHC). The most important specifications of this magnet are a coil aperture of 150 mm and field integral of 35 Tm, which will be realized by Nb-Ti superconducting magnets operated at 12 kA at 1.9 K. [...]
2019 - 7 p.
- Published in : IEEE Trans. Appl. Supercond. 29 (2019) 4003607
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3.
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Test Result of the HL-LHC Beam Separation Dipole Model Magnet With the New Iron Cross Section
/ Suzuki, Kento (KEK, Tsukuba) ; Enomoto, Shun (KEK, Tsukuba) ; Higashi, Norio (KEK, Tsukuba) ; Iida, Masahisa (KEK, Tsukuba) ; Ikemoto, Yukiko (KEK, Tsukuba) ; Kawamata, Hiroshi (KEK, Tsukuba) ; Kimura, Nobuhiro (KEK, Tsukuba) ; Nakamoto, Tatsushi (KEK, Tsukuba) ; Ogitsu, Toru (KEK, Tsukuba) ; Ohata, Hirokatsu (KEK, Tsukuba) et al.
We report the test results of the second short model magnet of the beam separation dipole for the High Luminosity Large Hadron Collider. The test shows that the second model has a good training performance and is capable of operating at the ultimate current that corresponds to 108% of the nominal one. [...]
2019 - 5 p.
- Published in : IEEE Trans. Appl. Supercond. 29 (2019) 4000905
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4.
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Field Measurement to Evaluate Iron Saturation and Coil End Effects in a Modified Model Magnet of Beam Separation Dipole for the HL-LHC Upgrade
/ Enomoto, Shun (KEK, Tsukuba) ; Sugano, Michinaka (KEK, Tsukuba) ; Nakamoto, Tatsushi (KEK, Tsukuba) ; Suzuki, Kento (KEK, Tsukuba) ; Okada, Naoki (KEK, Tsukuba) ; Kawamata, Hiroshi (KEK, Tsukuba) ; Sasaki, Ken-ichi (KEK, Tsukuba) ; Ikemoto, Yukiko (KEK, Tsukuba) ; Tanaka, Kenichi (KEK, Tsukuba) ; Ohhata, Hirokatsu (KEK, Tsukuba) et al.
A beam separation dipole magnet for the high luminosity large hadron collider upgrade is developed. The development of the 2-m-long model magnet (MBXFS1) was initiated so as to evaluate the design and performance of the beam separation dipole magnet. [...]
2018 - 5 p.
- Published in : IEEE Trans. Appl. Supercond. 28 (2018) 4004505
In : 25th International Conference on Magnet Technology, Amsterdam, The Netherlands, 27 Aug - 1 Sep 2017, pp.4004505
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5.
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Fabrication and Test Results of the First 2 m Model Magnet of Beam Separation Dipole for the HL-LHC Upgrade
/ Sugano, Michinaka (KEK, Tsukuba) ; Nakamoto, Tatsushi (KEK, Tsukuba) ; Enomoto, Shun (KEK, Tsukuba) ; Kawamata, Hiroshi (KEK, Tsukuba) ; Okada, Naoki (KEK, Tsukuba) ; Okada, Ryutaro (KEK, Tsukuba) ; Sasaki, Ken-ichi (KEK, Tsukuba) ; Ogitsu, Toru (KEK, Tsukuba) ; Kimura, Nobuhiro (KEK, Tsukuba) ; Tanaka, Kenichi (KEK, Tsukuba) et al.
The large aperture superconducting beam separation dipole (D1) must be developed as part of the high luminosity upgrade of the Large Hadron Collider (HL-LHC) at CERN. The most important specifications of the D1 are a coil aperture of 150 mm and field integral of 35 T·m at 12.0 kA and 1.9 K. [...]
2017 - 9 p.
- Published in : IEEE Trans. Appl. Supercond. 27 (2017) 4002409
In : Applied Superconductivity Conference, Denver, CO, USA, 4 - 9 Sep 2016, pp.4002409
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6.
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Quench Protection Heater Study With the 2-m Model Magnet of Beam Separation Dipole for the HL-LHC Upgrade
/ Suzuki, Kento ; Enomoto, Shun ; Higashi, Norio ; Iida, Masahisa ; Ikemoto, Yukiko ; Kawamata, Hiroshi ; Kimura, Nobuhiro ; Nakamoto, Tatsushi ; Ogitsu, Toru ; Ohata, H et al.
The beam separation dipole magnet (D1), which is being operated in the large hadron collider (LHC), has to be replaced in accordance with upgrade to the high-luminosity LHC. The new D1 will be equipped with several circuits of heaters by which most of the stored energy is dissipated in the whole of the magnet during its quench, thereby avoiding localization of hot spots. [...]
2018 - 5 p.
- Published in : IEEE Trans. Appl. Supercond. 28 (2018) 4002505
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7.
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Influence of 3D Effects on Field Quality in the Straight Part of Accelerator Magnets for the High Luminosity Large Hadron Collider
/ Nilsson, Emelie (CERN) ; Izquierdo Bermudez, Susana (CERN) ; Todesco, Ezio ; Enomoto, Shun ; Farinon, Stefania ; Fabbricatore, Pasquale ; Nakamoto, Tatsushi ; Sugano, Michinaka ; Savary, Frederic
A dedicated D1 beam separation dipole is currently being developed at KEK for the Large Hadron Collider Luminosity upgrade (HL-LHC). Four 150 mm aperture, 5.6 T magnetic field and 6.7 m long Nb-Ti magnets will replace resistive D1 dipoles. [...]
2018 - 1 p.
- Published in : IEEE Trans. Appl. Supercond. 28 (2018) 4003005
Fulltext: PDF;
In : 25th International Conference on Magnet Technology, Amsterdam, The Netherlands, 27 Aug - 1 Sep 2017, pp.4003005
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8.
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Magnetic Field Measurement of 2-m-Long Model of Beam Separation Dipole for the HL-LHC Upgrade
/ Enomoto, Shun (KEK, Tsukuba) ; Sugano, Michinaka (KEK, Tsukuba) ; Nakamoto, Tatsushi (KEK, Tsukuba) ; Okada, Naoki (KEK, Tsukuba) ; Kawamata, Hiroshi (KEK, Tsukuba) ; Sasaki, Ken-ichi (KEK, Tsukuba) ; Tanaka, Kenichi (KEK, Tsukuba) ; Ohhata, Hirokatsu (KEK, Tsukuba) ; Iida, Masahisa (KEK, Tsukuba) ; Okada, Ryutaro (KEK, Tsukuba) et al.
Abstract:
KEK has been developing a beam separation dipole magnet for the high luminosity large hadron collider upgrade. The magnet has a coil aperture of 150 mm and uses NbTi superconducting cable. [...]
2017 - 5 p.
- Published in : IEEE Trans. Appl. Supercond. 27 (2017) 0600705
In : Applied Superconductivity Conference, Denver, CO, USA, 4 - 9 Sep 2016, pp.0600705
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