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Journal Articles

Design of $$gamma$$-ray and neutron area monitoring system for the IFMIF/EVEDA accelerator building

Takahashi, Hiroki; Maebara, Sunao; Kojima, Toshiyuki; Kubo, Takashi; Sakaki, Hironao; Takeuchi, Hiroshi; Shidara, Hiroyuki; Hirabayashi, Keiichi*; Hidaka, Kosuke*; Shigyo, Nobuhiro*; et al.

Fusion Engineering and Design, 86(9-11), p.2795 - 2798, 2011/10

 Times Cited Count:2 Percentile:20.43(Nuclear Science & Technology)

In the IFMIF/EVEDA accelerator, the engineering validation up to 9 MeV by employing the deuteron beam of 125 mA are planning at the BA site in Rokkasho, Aomori, Japan, the personnel protection system (PPS) is indispensable. The PPS inhibit the beam by receiving the interlock signal from the $$gamma$$-ray and neutron monitoring system. The $$gamma$$-ray and neutron detection level which is planned to be adopted are "80 keV to 1.5 MeV ($$gamma$$-ray)" and "0.025 eV to 15 MeV (neutron)". For the present shielding design, it is absolutely imperative for the safety review to validate the shielding ability which makes detection level lower than these $$gamma$$-ray and neutron detector. For this purpose, the energy reduction of neutron and photon for water and concrete is evaluated by PHITS code. From the calculating results, it is found that the photon energy range extended to 10 MeV by water and concrete shielding material only, an additional shielding to decrease the photon energy of less than 1.5 MeV is indispensable.

Journal Articles

Some error studies for interface management in the HEBT of the IFMIF accelerator

Shidara, Hiroyuki; Vermare, C.*; Sugimoto, Masayoshi; Toupet, S.*; Garin, P.*

Fusion Engineering and Design, 86(9-11), p.2674 - 2677, 2011/10

 Times Cited Count:0 Percentile:0.01(Nuclear Science & Technology)

The IFMIF accelerator system is based on two similar beam lines running in parallel. Each D$$^{+}$$ beam of 40 MeV/125 mA is transported by a High Energy Beam Transport (HEBT) line up to the liquid lithium target where neutrons will be produced. On the target, the specifications of the beam footprint mentioned a rectangular shape (20 cm $$times$$ 5 cm]) with a flat-topped homogenious current density profile and small energy spread. As a view point of the boundary condition management for the interface to the Lithium target, we demonstrate and simulate the beam after HEBT for clarifying the beam character on the beam robustness against the misalignment and mis-accelerated condition etc. regarding the effect to the Lithium target. The tolerance on beam axis off-set at HEBT inlet is estimated around $$pm$$0.2 mm. The energy acceleration dependence shows small footprint robustness in case of mis-accelerated situation but better robustness for over-accelerated condition.

Journal Articles

Values of construction of IFMIF accelerator prototype and targeted issues

Sugimoto, Masayoshi; Garin, P.*; Vermare, C.*; Shidara, Hiroyuki; Kimura, Haruyuki; Suzuki, Hiromitsu; Ohira, Shigeru; Okumura, Yoshikazu; Mosnier, A.*; Facco, A.*; et al.

Kasokuki, 7(2), p.110 - 118, 2010/07

International Fusion Materials Irradiation Facility (IFMIF) is an accelerator-based neutron irradiation facility dedicated for development of fusion materials. Engineering Validation and Engineering Design Activities (EVEDA) phase of IFMIF project has been initiated in June 2007 and a prototype of the IFMIF accelerator (40 MeV - 125 mA CW Deuteron) is under construction in Rokkasho, Aomori. The target of the prototype is 9 MeV - 125 mA CW beam operation, which is full scale prototyping up to the first tank of superconducting linac section. In this report, the major technical specifications and issues of this extremely high-power machine are overviewed and expected results through operation in future are summarized.

Journal Articles

Recent progress in the energy recovery linac project in Japan

Sakanaka, Shogo*; Akemoto, Mitsuo*; Aoto, Tomohiro*; Arakawa, Dai*; Asaoka, Seiji*; Enomoto, Atsushi*; Fukuda, Shigeki*; Furukawa, Kazuro*; Furuya, Takaaki*; Haga, Kaiichi*; et al.

Proceedings of 1st International Particle Accelerator Conference (IPAC '10) (Internet), p.2338 - 2340, 2010/05

Future synchrotron light source using a 5-GeV energy recovery linac (ERL) is under proposal by our Japanese collaboration team, and we are conducting R&D efforts for that. We are developing high-brightness DC photocathode guns, two types of cryomodules for both injector and main superconducting (SC) linacs, and 1.3 GHz high CW-power RF sources. We are also constructing the Compact ERL (cERL) for demonstrating the recirculation of low-emittance, high-current beams using above-mentioned critical technologies.

Journal Articles

Development of 28 GHz and 77 GHz 1 MW gyrotron for ECRH of magnetically confined plasma

Kariya, Tsuyoshi*; Minami, Ryutaro*; Imai, Tsuyoshi*; Sakamoto, Keishi; Kubo, Shin*; Shimozuma, Takashi*; Takahashi, Hiromi*; Ito, Satoshi*; Muto, Takashi*; Mitsunaka, Yoshika*; et al.

Fusion Science and Technology, 55(2T), p.91 - 94, 2009/02

 Times Cited Count:11 Percentile:63.13(Nuclear Science & Technology)

Oral presentation

Present status of Japanese tasks for the IFMIF/EVEDA accelerator system

Shinto, Katsuhiro; Ohira, Shigeru; Kikuchi, Takayuki; Kubo, Takashi; Yonemoto, Kazuhiro; Kasuya, Kenichi; Maebara, Sunao; Takahashi, Hiroki; Kojima, Toshiyuki; Tsutsumi, Kazuyoshi; et al.

no journal, , 

no abstracts in English

Oral presentation

Present status of the IFMIF/EVEDA prototype accelerator construction

Shidara, Hiroyuki; Vermare, C.*; Sugimoto, Masayoshi; Garin, P.*; Maebara, Sunao; Shinto, Katsuhiro; Mosnier, A.*; Ibarra, A.*; Facco, A.*

no journal, , 

no abstracts in English

Oral presentation

Present status of the IFMIF/EVEDA prototype accelerator construction

Shidara, Hiroyuki; Matsumoto, Hiroshi; Sugimoto, Masayoshi; Mosnir, A.*

no journal, , 

The Engineering Validation and Engineering Design Activities of the IFMIF are on-going and will deliver confirmations and knowledge required to start the construction. At the Rokkasho site in Japan, the prototype accelerator will be installed and commissioned. The prototype accelerator accelerates deuteron beam up to 9 MeV by the injector, the RFQ, and the first section of IFMIF SRF-Linac for realizing the IFMIF, an accelerator driven neutron source with the deuteron accelerator(s) of (2 $$times$$ 125) mA/40 MeV/CW/ over 160 hours continuous operation. The experimental activities at Rokkasho will be set out from 2013, starting with the injector installation. The entire experiment's starting is scheduled on 2016. The R&D is being collaboratively carried out by relating EU countries of France/CEA, Spain/Ciemat and Italy/INFN and Japan (JAEA), and their coordination and the project management are done by the project team. On this presentation, the progress and the present status of R&D by EU is focused.

Oral presentation

LIPAc, the 125 mA / 9 MeV / CW deuteron IFMIF's prototype accelerator; What lessons have we learnt from LEDA ?

Scantamburlo, F.*; Knaster, J.*; Okumura, Yoshikazu; Kasugai, Atsushi; Shidara, Hiroyuki*; Chauvin, N.*; Gobin, R.*; Nghiem, P. A. P.*

no journal, , 

The Engineering Validation and Engineering Design Activities (EVEDA) phase of IFMIF aims at running a 9 MeV / 125 mA / CW deuteron accelerator to demonstrate the feasibility of IFMIF's 40 MeV / 125 mA / CW accelerator with components mainly designed and constructed in European labs. LEDA was operated successfully in 1999-2001 as a 6.7 MeV / 100 mA / CW proton accelerator with high availability. The present paper assesses the experience gained in LEDA and explains how LIPAc, the IFMIF prototype accelerator, is inheriting its role of breaking through technological boundaries.

Oral presentation

Development of poloidal steering equatorial launcher for ITER

Takahashi, Koji; Abe, Ganji; Isozaki, Masami; Kobayashi, Noriyuki*; Shidara, Hiroyuki; Oda, Yasuhisa; Ikeda, Ryosuke; Kobayashi, Takayuki; Moriyama, Shinichi; Sakamoto, Keishi

no journal, , 

An ITER equatorial EC launcher has been designed to inject a 170 GHz, 20 MW millimeter wave beam to plasma with poloidal steering functionality in order to obtain more driven current at the peripheral region of plasma. The millimeter wave design to accomplish the high transmission efficiency more than 99% and to compliant with the requirement on heat load on the mirror s and beam size at the resonance location of plasma has been successfully developed. The mock-up to simulate the millimeter wave propagation in the launcher based on the design modification of the beam path is fabricated and the low power experiment is in progress. The field pattern measurement at the mock-up outlet indicates the validity of the design optimization of mirror's and the waveguide set-up. The design of the millimeter wave beam path for poloidal steering launcher and the experiments of the launcher mock-up are reported in detail at the workshop.

Oral presentation

Development and preparation for JT-60SA ECH system

Moriyama, Shinichi; Kobayashi, Takayuki; Sawahata, Masayuki; Terakado, Masayuki; Hiranai, Shinichi; Wada, Kenji; Hinata, Jun; Sato, Fumiaki; Yokokura, Kenji; Hoshino, Katsumichi; et al.

no journal, , 

Assembly of the JT-60SA and preparation of its ECH system are progressing and the first plasma is planned in 2019. The high voltage power supply for two gyrotrons will be procured by EU. The procurement arrangement was signed in July 2015. Its fabrication in EU will be done in 2016 and the installation to the Naka-site will be in 2017. Oscillations at 1 MW for 100 s as the development target of the JT-60SA gyrotron were achieved at both 110 GHz and 138 GHz in June 2014. The gyrotron is the first "1 MW multi-frequency gyrotron" reached the pulse duration of 100s at two frequencies. In addition, 82 GHz oscillation was achieved at 1.0 MW for 1 sec by this gyrotron in June 2015. This additional frequency would be applicable to plasma start-up assistance and wall conditioning at the fundamental EC resonance in JT-60SA. Development is steadily progressing on the waveguide components and the launcher.

Oral presentation

Mock-up test results of ITER ECH Equatorial launcher's mm-wave design

Shidara, Hiroyuki; Takahashi, Koji; Komatsuzaki, Manabu*; Isozaki, Masami; Kobayashi, Noriyuki*; Abe, Teruo*; Abe, Ganji; Oda, Yasuhisa; Ikeda, Ryosuke; Kobayashi, Takayuki; et al.

no journal, , 

In order to validate the millimeter wave design procedure, the EL mock-up has been constructed and the low power test has been carried out by using mW-level low power RF oscillators. The test has been carried out with critical four edged beams instead of all eight beams in the upper waveguide unit. The measured data has been compared with design at several important locations in the launcher and after the launcher exit with steering mirror angle changed. The comparison of the measured beams propagation and the design shows good agreement for the beam sizes and the beam orientation performance. The quantitative evaluations has been carried out and the design procedure's reasonability has been confirmed.

Oral presentation

Progress in ECH system development for JT-60SA

Moriyama, Shinichi; Kobayashi, Takayuki; Sawahata, Masayuki; Terakado, Masayuki; Hiranai, Shinichi; Wada, Kenji; Hinata, Jun; Sato, Fumiaki; Yokokura, Kenji; Hoshino, Katsumichi; et al.

no journal, , 

Assembly of the JT-60SA and preparation of its ECH system are progressing and the first plasma is planned in 2019. The high voltage power supply for two gyrotrons will be procured by EU. The procurement arrangement was signed in July 2015. Its fabrication in EU will be done in 2016 and the installation to the Naka-site will be in 2017. Oscillations at 1 MW for 100 s as the development target of the JT-60SA gyrotron were achieved at both 110 GHz and 138 GHz in June 2014. The gyrotron is the first "1 MW multi-frequency gyrotron" reached the pulse duration of 100s at two frequencies. In addition, 82 GHz oscillation was achieved at 1.0 MW for 1 sec by this gyrotron in June 2015. This additional frequency would be applicable to plasma start-up assistance and wall conditioning at the fundamental EC resonance in JT-60SA. Development is steadily progressing on the waveguide components and the launcher.

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