Yoshihiro Nabara

Cable Behavior During Manufacture of a 900-m Scale CICC

Tomone Suwa, Yoshihiro Nabara, Yoshikazu Takahashi, M. Oshikiri et autres

The International Thermonuclear Experimental Reactor (ITER) magnet system is composed of four kinds of large superconducting magnets. Those magnets are manufactured by using cable-in-conduit conductors (CICCs). In the production process of the CICCs, the superconducting cable is inserted into a stainless steel …

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Performance Analysis of Mass-Produced Nb3Sn Conductor for Central Solenoid in ITER

Yoshihiro Nabara, Tomone Suwa, Hidemasa Ozeki, Hideki Kajitani et autres

The performance of two mass-produced Nb3Sn conductors for the ITER central solenoids was tested for the first timmass-produced Nb3Sn conductorse. One was cut from the forward end of an 80-m-long conductor, and the other was cut from the forward end of a …

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ITER Central Solenoid Insert Test Results

Nicolai N Martovetsky, Takaaki Isono, D. Bessette, Yoshikazu Takahashi et autres

The ITER central solenoid (CS) is a highly stressed magnet that must provide 30 000 plasma cycles under the ITER prescribed maximum operating conditions. To verify the performance of the ITER CS conductor in conditions close to those for the ITER CS, …

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Analysis of Normal Zone Propagation and Hot Spot Temperature on ITER CS Insert Coil

Tomone Suwa, Hidemasa Ozeki, Yoshihiro Nabara, Tôru Saitô et autres

The Central Solenoid (CS) insert coil consists of a 42-m-long CS conductor, of which the specifications are the same as that of the ITER CS. In order to investigate normal zone propagation and hot spot temperature, a quench test was carried out …

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Current-sharing Temperature Characteristics of ITER Central Solenoid Insert Coil

Yoshihiro Nabara, Tôru Saitô, Tomone Suwa, Hidemasa Ozeki et autres

The performance of the ITER central solenoid insert (CSI) conductor was tested in 2015. The current-sharing temperatures (Tcs) were measured over 16,000 electromagnetic cycles, including three thermal cycles between 4.2 K and room temperature. Tcs under the initial magnetization (IM) condition (13 …

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Stability Test using an Inductive Heater on the ITER CS Insert Coil

Hidemasa Ozeki, Tomone Suwa, Takaaki Isono, Yoshikazu Takahashi et autres

For the stable operation of the Central Solenoid (CS) coil of the ITER without quenching, it is important to know the threshold of allowable external heating energy the CS conductor can be subjected to during operation. To evaluate the minimum quench energy …

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Manufacture of superconductors for toroidal field coil and center solenoid in ITER

Yoshihiro Nabara, Tomone Suwa, Hidemasa Ozeki, Yoshihiko Nunoya et autres

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ITER Central Solenoid Insert Test Results

Nicolai N Martovetsky, Takaaki Isono, D. Bessette, Yoshikazu Takahashi et autres

The ITER central solenoid (CS) is a highly stressed magnet that must provide 30 000 plasma cycles under the ITER prescribed maximum operating conditions. To verify the perfor-mance of the ITER CS conductor in conditions close to those for the ITER CS, …

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Analysis of Internal-Tin $\hbox{Nb}_{3}\hbox{Sn}$ Conductors for ITER Central Solenoid

Tomone Suwa, Yoshihiro Nabara, Hidemasa Ozeki, T. Hemmi et autres

Japan Atomic Energy Agency (JAEA) is procuring 100% of the ITER Central Solenoid (CS) conductors. The CS conductor is required to maintain the performance under 60000 pulsed electromagnetic cycles. JAEA tested two internal-tin Nb3Sn conductors for the CS at the SULTAN test …

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Behavior of $\hbox{Nb}_{3}\hbox{Sn}$ Cable Assembled With Conduit for ITER Central Solenoid

Yoshihiro Nabara, Tomone Suwa, Yoshikazu Takahashi, T. Hemmi et autres

We describe herein the characteristics of a Nb3Sn cable inserted into a conduit (cable-in-conduit conductor) for the International Thermonuclear Experimental Reactor toroidal field (TF) coil and central solenoid (CS). During insertion, the pulling force almost linearly increases as a function of the …

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Development of Manufacturing Technologies for ITER Toroidal Field Coil Conductors

Kazuya Hamada, Yoshikazu Takahashi, Yoshihiro Nabara, Katsumi Kawano et autres

The Japan Atomic Energy Agency (JAEA) is responsible for procuring 25% of the ITER toroidal field (TF) coil conductors as the Japanese Domestic Agency (JADA) for the ITER project. The TF conductor is a circular shaped, cable-inconduit conductor, composed of a cable …

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Mass Production and Quality Control of Nb3Sn Superconducting Strands for ITER Toroidal Field Coils

Yoshihiro Nabara, Yoshihiko Nunoya, Takaaki ISONO, Kazuya Hamada et autres

Superconducting conductors are applied in the toroidal field (TF) coils, poloidal field coils, and central solenoid (CS) in the ITER. The Japan Atomic Energy Agency plans to procure 25% of the TF conductors and 100% of the CS conductors. Mass-produced Nb 3Sn …

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