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1.
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Measurement and simulations of high-energy neutrons through a various thickness of concrete and steel shields using activation detectors at CHARM and CSBF
/ Nakao, Noriaki (Tokyo Inst. Tech.) ; Sanami, Toshiya (KEK, Tsukuba) ; Kajimoto, Tsuyoshi (Hiroshima U.) ; Yashima, Hiroshi (Kyoto Sangyo U.) ; Froeschl, Robert (CERN) ; Bozzato, Davide (CERN) ; Iliopoulou, Elpida (CERN) ; Infantino, Angelo (CERN) ; Lee, Eunji (Kyushu U.) ; Oyama, Takahiro (KEK, Tsukuba) et al.
A shielding experiment using activation detectors was performed at the CERN High-energy AcceleRator Mixed-field (CHARM) facility and the CERN Shielding Benchmark Facility (CSBF). The protons (24 GeV/c) were bombarded into a 50-cm-thick copper target, and the released neutrons were transmitted through various shields located vertically upward from the target. [...]
2023 - 19 p.
- Published in : J. Nucl. Sci. Tech. 61 (2023) 429-447
Fulltext: PDF;
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2.
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Measurement of neutron spectra for various thicknesses of concrete and steel shielding at 24-GeV/c proton beam facility using Bonner sphere spectrometer
/ Matsumoto, Tetsuro (AIST, Tsukuba) ; Masuda, Akihiko (AIST, Tsukuba) ; Lee, Eunji (KEK, Tsukuba ; Kyushu U.) ; Sanami, Toshiya (KEK, Tsukuba) ; Oyama, Takahiro (KEK, Tsukuba) ; Kajimoto, Tsuyoshi (Hiroshima U.) ; Nakao, Noriaki (Shimizu, Tokyo) ; Yashima, Hiroshi (Kyoto U.) ; Nagaguro, Seiji (KEK, Tsukuba) ; Uwamino, Yoshitomo (Shimizu, Tokyo) et al.
Neutron energy spectra down to thermal energy were measured using a Bonner sphere spectrometer (BSS) for various thicknesses of concrete and steel shielding at the CERN/CHARM facility, where high-energy neutrons were produced by 24-GeV/c protons incident on a thick copper target. The thicknesses of the concrete and steel shielding blocks ranged from 40 cm to 200 cm and from 20 cm to 80 cm, respectively. [...]
2024 - 13 p.
- Published in : J. Nucl. Sci. Tech. 61 (2024) 98-110
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3.
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Benchmark Experiments for Bulk and Maze Shielding Using Activation Detectors with 24-GeV/c Protons at CERN/CHARM
/ Nakao, Noriaki (Tokyo U. Marine Sci. Tech.) ; Sanami, Toshiya (KEK, Tsukuba) ; Kajimoto, Tsuyoshi (Hiroshima U.) ; Froeschl, Robert (CERN) ; Bozzato, Davide (CERN ; KIT, Karlsruhe) ; Iliopoulou, Elpida (CERN) ; Infantino, Angelo (CERN) ; Yashima, Hiroshi (Kyoto Sangyo U.) ; Lee, Eunji (KEK, Tsukuba ; Kyushu U., Fukuoka (main)) ; Oyama, Takahiro (KEK, Tsukuba) et al.
Measurements of high-energy neutrons through shield penetration and maze streaming were performed at the Conseil Européen pour la Recherche Nucléaire (CERN) High-energy Accelerator Mixed-Field (CHARM) facility. The protons of 24 GeV/c were injected onto a 50-cm-thick copper target and the released neutrons were transmitted through shields and a maze in the facility. [...]
2024 - 12 p.
- Published in : Nucl. Sci. Eng. 198 (2024) 336-347
Fulltext: PDF;
In : 14th International Conference on Radiation Shielding & 21st Topical Meeting of the Radiation Protection and Shielding Division, Seattle, WA, USA, 25 - 29 Sep 2022, pp.336-347
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4.
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Measurements and Monte Carlo simulations of high-energy neutron streaming through the access maze using activation detectors at 24 GeV/c proton beam facility of CERN/CHARM
/ Nakao, Noriaki (Shimizu, Tokyo) ; Kajimoto, Tsuyoshi (Hiroshima U. (main)) ; Sanami, Toshiya (KEK, Tsukuba) ; Froeschl, Robert (CERN) ; Iliopoulou, Elpida (CERN) ; Infantino, Angelo (CERN) ; Yashima, Hiroshi (Kyoto U. (main)) ; Oyama, Takahiro (KEK, Tsukuba) ; Nagaguro, Seiji (KEK, Tsukuba) ; Lee, Eunji (Kyushu U., Fukuoka (main) ; NCSU, Raleigh) et al.
A measurement of high-energy neutron streaming was performed through a maze at the CERN (Conseil Européen pour la Recherche Nucléaire) High-energy AcceleRator Mixed-field (CHARM) facility. The protons of 24 GeV/c were injected onto a 50-cm-thick copper target and the released neutrons were streamed through a maze with several corridor-legs horizontally designed with the shield walls in the facility. [...]
2021 - 9 p.
- Published in : J. Nucl. Sci. Tech. 58 (2021) 899-907
Fulltext: PDF;
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5.
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Measurements of secondary-particle emissions from copper target bombarded with 24-GeV/c protons
/ Oyama, Takahiro (KEK, Tsukuba) ; Sanami, Toshiya (KEK, Tsukuba) ; Yashima, Hiroshi (Kyoto U., KURRI) ; Hagiwara, Masayuki (KEK, Tsukuba) ; Nakao, Noriaki (Shimizu, Tokyo) ; Infantino, Angelo (CERN) ; Iliopoulou, Elpida (CERN) ; Froeschl, Robert (CERN) ; Roesler, Stefan (CERN) ; Kajimoto, Tsuyoshi (Hiroshima U.) et al.
To devise an activation technique for characterizing mixed radiation fields, secondary particles from a copper target irradiated by 24 GeV/c protons were measured at the CERN High-energy AcceleRator Mixed field facility (CHARM). Activation detector sets consisting of aluminum, niobium, indium, and bismuth, were placed at 30 cm from the target at angles of 15° to 160° with respect to the beam axis. [...]
2021 - 10 p.
- Published in : Nucl. Instrum. Methods Phys. Res., A 990 (2021) 164977
Fulltext: PDF;
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6.
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High Power Test for Plug-compatible STF-type Power Coupler for ILC
/ Yamamoto, Yasuchika (KEK, Tsukuba) ; Julie, Charles (CERN) ; Kako, Eiji (KEK, Tsukuba) ; Matsumoto, Toshihiro (KEK, Tsukuba) ; Michizono, Shinichiro (KEK, Tsukuba) ; Montesinos, Eric (CERN) ; Yamamoto, Akira (KEK, Tsukuba)
From the view point of plug-compatibility for the power coupler in the ILC, recommended by Linear Collider Collaboration in 2013, new STF-type power couplers with 40mm of input port diameter were re-designed, fabricated and successfully high-power-tested. Moreover, from the view point of the cost reduction for the ILC, another type of power couplers with TiN coating-free ceramic were also fabricated and high-power-tested by the collaboration between CERN and KEK. [...]
2018 - 6 p.
- Published in : 10.18429/JACoW-SRF2017-MOPB064
Fulltext: PDF;
In : 18th International Conference on RF Superconductivity, Lanzhou, China, 17 - 21 Jul 2017, pp.MOPB064
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7.
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Availability of the TiN Coating-Free Ceramic in the STF-type Power Coupler for ILC
/ Yamamoto, Yasuchika (KEK, Tsukuba) ; Irikura, Masao (TETD, Otawara) ; Ishibashi, Makoto (TETD, Otawara) ; Julie, Charles (CERN) ; Kako, Eiji (KEK, Tsukuba) ; Matsumoto, Toshihiro (KEK, Tsukuba) ; Michizono, Shinichiro (KEK, Tsukuba) ; Montesinos, Eric (CERN) ; Yamamoto, Akira (KEK, Tsukuba) ; Yasutake, Hiroto (TETD, Otawara)
In the Superconducting RF Test Facility (STF) in KEK, the research and development for the power coupler with the TiN coating-free ceramic has been done from 2014. In 2016, the high power test at the test bench was stopped due to the worse vacuum level by the unusual heating around the RF window with the TiN coating-free ceramic and the coaxial tapered section, which was caused by the enormous emission of the secondary electrons from the ceramic. [...]
2018 - 3 p.
- Published in : 10.18429/JACoW-IPAC2018-WEPML053
Fulltext: PDF;
In : 9th International Particle Accelerator Conference, Vancouver, Canada, 29 Apr - 4 May 2018, pp.WEPML053
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8.
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Characterization of the PTW 34031 ionization chamber (PMI) at RCNP with high energy neutrons ranging from 100 – 392 MeV
/ Theis, C (CERN) ; Carbonez, P (CERN) ; Feldbaumer, E (CERN) ; Forkel-Wirth, D (CERN) ; Jaegerhofer, L (CERN) ; Pangallo, M (CERN) ; Perrin, D (CERN) ; Urscheler, C (CERN) ; Roesler, S (CERN) ; H Vincke (CERN) et al.
Radiation monitoring at high energy proton accelerators poses a considerable challenge due to the complexity of the encountered stray radiation fields. These environments comprise a wide variety of different particle types and span from fractions of electron-volts up to several terra electron-volts. [...]
2017 - 5 p.
- Published in : EPJ Web Conf. 153 (2017) 08018
Fulltext: PDF;
In : 13th International Conference on Radiation Shielding & 19th Topical Meeting of the Radiation Protection & Shielding Division of the American Nuclear Society 2016, Paris, France, 3 - 6 Oct 2016, pp.08018
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9.
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STF-2 Cryomodule Performance and New Input Coupler R&D; for ILC
/ Yamamoto, Yasuchika (KEK, Tsukuba) ; Honma, Teruya (KEK, Tsukuba) ; Kako, Eiji (KEK, Tsukuba) ; Kojima, Yuuji (KEK, Tsukuba) ; Matsumoto, Toshihiro (KEK, Tsukuba) ; Michizono, Shinichiro (KEK, Tsukuba) ; Nakai, Hirotaka (KEK, Tsukuba) ; Shishido, Toshio (KEK, Tsukuba) ; Yamamoto, Akira (KEK, Tsukuba) ; Julie, Charles (CERN) et al.
The high power test for STF -2 cryomodule with twelve cavities has completed successfully in 2015. It became clear the average accelerating gradient was 30.3 MV/m, eight cavities achi eved above 31.5 MV/m as the ILC specification, and three cavities had the significant performance degradation by heavy field emission due to the additional clean room work in t he STF tunnel. [...]
SISSA, 2016 - 6 p.
- Published in : PoS ICHEP2016 (2016) 066
Fulltext: PDF; External link: PoS server
In : 38th International Conference on High Energy Physics, Chicago, IL, USA, 03 - 10 Aug 2016, pp.066
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10.
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Microscopic approach to NA and AA scattering in the framework of chiral effective field theory and Brueckner-Hartree-Fock theory
/ Toyokawa, M (Kyushu U.) ; Yahiro , M (Kyushu U.) ; Matsumoto, T (Kyushu U.) ; Minomo, K (Osaka U., Res. Ctr. Nucl. Phys.) ; Ogata, K (Osaka U., Res. Ctr. Nucl. Phys.) ; M. Kohno (Osaka U., Res. Ctr. Nucl. Phys.)
Geneva : CERN, 2015
Published version from CERN: PDF;
In : 14th International Conference on Nuclear Reaction Mechanisms, Villa Monastero, Varenna, Italy, 15 - 19 Jun 2015, pp.189
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