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Development of the Directly-Sliced Niobium Material for High Performance SRF Cavities
/ Kumar, Ashish (KEK, Tsukuba) ; Araki, Hayato (KEK, Tsukuba) ; Dohmae, Takeshi (KEK, Tsukuba) ; Ito, Hayato (KEK, Tsukuba) ; Saeki, Takayuki (KEK, Tsukuba) ; Umemori, Kensei (KEK, Tsukuba) ; Yamamoto, Akira (KEK, Tsukuba ; CERN ; JAI, UK ; Oxford U.) ; Yamanaka, Masashi (KEK, Tsukuba)
For the purpose of cost reduction for the ILC, KEK has been conducting R&D; on direct sliced Nb materials such as large grain and medium grain Nb. Single-cell, 3-cell, and 9-cell cavities have been manufactured, and each has demonstrated a high-performance accelerating gradient exceeding 35 MV/m. [...]
2023 - 7 p.
- Published in : JACoW SRF 2023 (2023) 634-640
Fulltext: PDF;
In : 21st International Conference on Radio-Frequency Superconductivity (SRF 2023), Grand Rapids, MI, United States, 22 - 30 Jun 2023, pp.634-640
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2.
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Fabrication and Low-Power Test of Disk-and-Washer Cavity for Muon Acceleration
/ Takeuchi, Yusuke (Kyushu U.) ; Cicek, Ersin (KEK, Tsukuba) ; Ego, Hiroyasu (KEK, Tsukuba) ; Futatsukawa, Kenta (KEK, Tsukuba) ; Iwashita, Yoshihisa (Kyoto U., KURRI) ; Kawamura, Naritoshi (KEK, Tsukuba) ; Kitamura, Ryo (JAEA, Ibaraki) ; Kondo, Yasuhiro (J-PARC) ; Mibe, Tsutomu (KEK, Tsukuba) ; Morishita, Takatoshi (J-PARC) et al.
The muon g-2/EDM experiment is under preparation at Japan Proton Accelerator Research Complex (J-PARC), and the muon linear accelerator for the experiment is being developed. A Disk-and-Washer (DAW) cavity will be used for the medium-velocity part of the accelerator, and muons will be accelerated from v/c=ß=0.3 to 0.7 with the operating frequency of 1.296 GHz. [...]
2022 - 4 p.
- Published in : JACoW IPAC 2022 (2022) 1534-1537
Fulltext: PDF;
In : 13th International Particle Accelerator Conference (IPAC 2022), Bangkok, Thailand, 12 - 17 Jun 2022, pp.1534-1537
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3.
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The First Measurement of Low-loss 9-cell Cavity in a Cryomodule at STF
/ Saeki, T (KEK, Tsukuba) ; Akemoto, M (KEK, Tsukuba) ; Fukuda, S (KEK, Tsukuba) ; Furuta, F (KEK, Tsukuba) ; Hara, K (KEK, Tsukuba) ; Higashi, Y (KEK, Tsukuba) ; Higo, T (KEK, Tsukuba) ; Hosoyama, K (KEK, Tsukuba) ; Inoue, H (KEK, Tsukuba) ; Kabe, A (KEK, Tsukuba) et al.
2008 - 3 p.
External link: Published version from JACoW
In : 11th European Particle Accelerator Conference, Genoa, Italy, 23 - 27 Jun 2008, pp.MOPP029
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4.
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Medium-Grain Niobium SRF Cavity Production Technology for Science Frontiers and Accelerator ApplicationsMedium grain niobium SRF cavity production technology for science frontiers and accelerator applications
/ Myneni, G. (Old Dominion U. ; Unlisted, US ; Old Dominion U. (main) ; Jefferson Lab) ; Hani E. Elsayed-Ali (Old Dominion U. ; Old Dominion U. (main)) ; Islam, Md Obidul (Old Dominion U. ; Old Dominion U. (main)) ; Sayeed, Md Nizam (Old Dominion U. ; Old Dominion U. (main)) ; Ciovati, G. (Jefferson Lab ; Old Dominion U.) ; Dhakal, P. (Jefferson Lab) ; Rimmer, R.A. (Jefferson Lab) ; Carl, M. (Unlisted, US) ; Fajardo, A. (Unlisted, US) ; Lannoy, N. (Unlisted, US) et al.
We propose cost-effective production of medium grain (MG) niobium (Nb) discs directly sliced from forged and annealed billet. This production method provides clean surface conditions and reliable mechanical characteristics with sub-millimeter average grain size resulting in stable SRF cavity production. [...]
arXiv:2203.07371.-
2023-04-21 - 14 p.
- Published in : JINST 18 (2023) T04005
Fulltext: PDF; External link: eConf
In : 2021 Snowmass Summer Study, Seattle, WA, United States, 11 - 20 July 2021, pp.T04005
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5.
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Cavity Diagnostic System for the Vertical Test of the STF Baseline 9-cell Cavity at KEK
/ Yamamoto, Y (KEK, Tsukuba) ; Hayano, H (KEK, Tsukuba) ; Kako, E (KEK, Tsukuba) ; Moon, S I (Pohang Accelerator Lab.) ; Noguchi, S (KEK, Tsukuba) ; Sakai, H (Tokyo U., ISSP) ; Satoh, M (KEK, Tsukuba) ; Shinoe, K (Tokyo U., ISSP) ; Shishido, T (KEK, Tsukuba) ; Umemori, K (KEK, Tsukuba) et al.
2008 - 3 p.
External link: Published version from JACoW
In : 11th European Particle Accelerator Conference, Genoa, Italy, 23 - 27 Jun 2008, pp.MOPP044
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6.
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Results of Vertical Tests for the KEK-ERL Single Cell Superconducting Cavities
/ Umemori, K (KEK, Tsukuba) ; Furuya, T (KEK, Tsukuba) ; Sakai, H (Tokyo U., ISSP) ; Sawamura, M (JAEA, Ibaraki) ; Shinoe, K (Tokyo U., ISSP) ; Takahashi, T (KEK, Tsukuba)
2008 - 3 p.
External link: Published version from JACoW
In : 11th European Particle Accelerator Conference, Genoa, Italy, 23 - 27 Jun 2008, pp.MOPP159
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7.
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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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8.
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Ingot Nb based SRF technology for the International Linear Collider
/ Yamamoto, Akira (KEK, Tsukuba ; CERN) ; Yamanaka, Masashi (KEK, Tsukuba) ; Myneni, Ganapati (Jefferson Lab)
The International Linear Collider (ILC) is anticipated to be built as the next energy-frontier electron-positron colliding accelerator with a global effort in particle physics.Niobium based Superconducting Radio-Frequency (SRF) technology is required to provide beam-accelerating structure with elliptical cavity strings to linearly accelerate the electron and positron beams up to 250 GeV and to realize a center-of-mass energy of 500 GeV in collisions. The accelerator design and R&D; efforts progressed, and the ILC Technical Design Report (ILC-TDR) was published in 2013. [...]
2015
- Published in : AIP Conf. Proc. 1687 (2015) 030005
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9.
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Design and Beam Dynamics Study of Disk-Loaded Structure for Muon Linac
/ Sumi, Kazumichi (Nagoya U.) ; Ego, Hiroyasu (KEK, Tsukuba) ; Iijima, Toru (Nagoya U.) ; Inami, Kenji (Nagoya U.) ; Kondo, Yasuhiro (J-PARC) ; Mibe, Tsutomu (KEK, Tsukuba) ; Moriya, Katsuhiro (JAEA, Ibaraki) ; Nakazawa, Yuga (Ibaraki U., Mito) ; Otani, Masashi (J-PARC) ; Saito, Naohito (KEK, Tsukuba) et al.
The disk-loaded structures (DLS) in the muon LINAC are under development for the J-PARC muon g-2/EDM experiment. Four DLSs with an accelerating gradient of 20 MV/m take charge of muon acceleration from 40 MeV to 212 MeV, which corresponds to 70% to 94% of the speed of light. [...]
2022 - 4 p.
- Published in : JACoW IPAC 2022 (2022) 94-97
Fulltext: PDF;
In : 13th International Particle Accelerator Conference (IPAC 2022), Bangkok, Thailand, 12 - 17 Jun 2022, pp.94-97
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10.
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Cryomodule Tests of the STF Baseline 9-cell Cavities at KEK
/ Kako, E (KEK, Tsukuba) ; Hayano, H (KEK, Tsukuba) ; Noguchi, S (KEK, Tsukuba) ; Ohuchi, N (KEK, Tsukuba) ; Sato, M (KEK, Tsukuba) ; Shishido, T (KEK, Tsukuba) ; Watanabe, K (KEK, Tsukuba) ; Yamamoto, Y (KEK, Tsukuba)
2008 - 3 p.
External link: Published version from JACoW
In : 11th European Particle Accelerator Conference, Genoa, Italy, 23 - 27 Jun 2008, pp.MOPP131
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