Fundamental welding R&amp;D results for manufacturing vacuum vessel of JT-60SA

Asano, Shiro; Okuyama, T.; Oonawa, Toshiwo; Yanagi, Yutaka; Ejiri, Mitsuru; Kanahara, T.; Ichihashi, Koji; Kikuchi, Atsushi; Mizumaki, S.; Masaki, K.; Shibama, Yusuke; Katayama, Masahiro; Sakasai, A.

doi:10.1016/j.fusengdes.2011.03.024

Cited by 15 publications

(6 citation statements)

References 2 publications

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“…The VV of JT-60SA [16,17] is a double-walled structure fabricated with AISI 316L stainless steel with two shells each 18 mm thick, an interspace of about 160 mm, filled with borated water, which provides temperature control as well as shielding to reduce the neutron budget during deuterium operation. Heated nitrogen gas flow for baking at 200 °C will also make use of the interspace between shells after draining the borated water.…”

Section: Vacuum Vessel Thermal Shield Cryostatmentioning

confidence: 99%

Progress of the JT-60SA project

Barabaschi¹,

Kamada²,

Shirai³

2019

Nucl. Fusion

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The JT-60SA project was initiated in June 2007 under the framework of the Broader Approach Agreement and Japanese National Fusion Programme for an early realization of fusion energy by conducting supportive and complementary work for the ITER project towards supporting the basis for DEMO. With the project now in an advanced implementation stage, the early defined approach for its implementation has proven to be successful and hence continues to be employed. This is underpinned by the very close collaboration between QST in Japan, F4E in Europe, and all other European stakeholders: the EU Voluntary Contributors and EUROfusion. As of September 2018, the closure of the torus has been accomplished. All TF coils have been manufactured, tested at full current and cryogenic temperature demonstrating a consistent temperature margin, and assembled. All manufacturing of equilibrium field coils was completed by the middle of August 2016. Three central solenoid (CS) modules were completed by March 2017 while manufacturing of the last CS module has recently been completed. The manufacture and delivery of all 26 high temperature superconductor current leads was completed in November 2017. All large power systems, including the switching network units and super conducting magnet power supplies, have also been manufactured, delivered and with few residual commissioning activities still ongoing in Naka. With the cryostat base already in place since 2013, the cryostat vessel body cylindrical section has been manufactured, preassembled, measured and delivered to Naka. The full scope of the cryoplant, manufacturing and commissioning, is now successfully completed. The final assembly phase has therefore started together with the gradual execution of integrated commissioning leading to the completion of the assembly in March 2020 and a first plasma in September 2020. The efficient start-up and scientific exploitation of JT-60SA by the large international team is a challenging enterprise, which will be similar to, and provide important input to, the ITER start-up phase. To optimize this phase, a broad set of coordinated activities have been carried out over recent years by a joint Japanese-EU JT-60SA research unit, fully integrated in the integrated project team and liaising with the broader Japanese and EU fusion physics community. The paper will provide an overview of the progress of the manufacturing and assembly of the JT-60SA machine towards first plasma, and progress in preparing for the next phases of JT-60SA following this milestone.

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Section: Vacuum Vessel Thermal Shield Cryostatmentioning

confidence: 99%

Progress of the JT-60SA project

Barabaschi¹,

Kamada²,

Shirai³

2019

Nucl. Fusion

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“…They were welded together on the Naka site to complete the VV sectors. As for the welding of adjoining VV sectors, grooving processing was performed taking into account of the degree of contraction obtained during the welding R&D [17]. The end faces of each VV sector were locally corrected by the pressure of jacks and heat input to avoid misalignment.…”

Section: Vacuum Vesselmentioning

confidence: 99%

Progress of JT-60SA Project: EU-JA joint efforts for assembly and fabrication of superconducting tokamak facilities and its research planning

Shirai

Barabaschi²,

Kamada

2016

Fusion Engineering and Design

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“…The total length of the welding line exceeds 40 km. Therefore, prior to manufacturing, fundamental R&D was performed and the fabrication sequence was established by the trial manufacturing of a 20 • upper half mock-up [13]. Based on the results of the R&D including mechanical tests of welding joints, three welding types were chosen for the double-wall structure of VV [14].…”

Section: Vacuum Vessel (Procured By Jaea)mentioning

confidence: 99%

Progress of the JT-60SA project

Kamada¹,

Barabaschi²,

Ishida³

2013

Nucl. Fusion

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The JT-60SA project implemented by Japan and Europe is progressing on schedule towards the first plasma in March 2019. After careful R&D, procurements of the major components have entered their manufacturing stages. In parallel, disassembly of JT-60U has been completed on time, and the JT-60SA tokamak assembly is expected to start in January 2013. The JT-60SA device, a highly shaped large superconducting tokamak with a variety of plasma control actuators, has been designed in order to contribute to ITER and to complement ITER in all the major areas of fusion plasma development necessary to decide DEMO reactor construction. Detailed assessments and prediction studies of the JT-60SA plasma regimes have confirmed these capabilities: using ITER-and DEMOrelevant plasma regimes, heating conditions, and its sufficiently long discharge duration, JT-60SA enables studies on magnetohydrodynamic stability at high beta, heat/particle/momentum transport, high-energy ion physics, pedestal physics including edge localized mode control, and divertor physics. By integrating these studies, the project provides 'simultaneous and steady-state sustainment of the key performance characteristics required for DEMO' with integrated control scenario development.

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Fundamental welding R&D results for manufacturing vacuum vessel of JT-60SA

Cited by 15 publications

References 2 publications

Progress of the JT-60SA project

Progress of the JT-60SA project

Progress of JT-60SA Project: EU-JA joint efforts for assembly and fabrication of superconducting tokamak facilities and its research planning

Progress of the JT-60SA project

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