Development of a Nb3Al Conductor to be Applied to a Fusion Reactor and Its Application to a Large Superconducting Coil

Koizumi, N.; Okuno, K.; Nakajima, Hideo; Ando, T.; Tsuji, Hiroshi

doi:10.2221/jcsj.38.391

Cited by 7 publications

(4 citation statements)

References 15 publications

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“…In the case of large scale conductors, cyclic excitation (13 T, 46 kA) was performed at the ITER Nb 3 Al insert coil test. Degradation of critical current was not observed after 10 3 cyclic excitations [7].…”

Section: Introductionmentioning

confidence: 80%

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Critical Current and Fracture Behavior of Nb3Al Superconducting Strands under Cyclic Electromagnetic Force

Wadayama¹,

Natsume²,

Mito³

et al. 2011

JMSE-A

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Abstract:To obtain basic information on fracture behavior and its critical current properties in superconducting strands with long-term periodic excitation, a unique experiment of cyclic strain loading was carried out. The strain was applied to a superconducting filament directly at 4.2 K using an electromagnetic (Lorenz) force instead of the usual mechanical load. The sample strands were Jelly-roll process Nb 3 Al with a copper ratio of 2.1. A new magnet system to evaluate long-term cyclic strain loading was set up. It was able to generate external fields up to 14 T with 58 mm bore. Cyclic strain was applied by the sample current control: 500 A, 0.1 Hz. In the experiment, critical current measurements and applied cyclic strain were carried out in alternation and the variation of critical current was obtained during the cyclic test. In this paper, the experimental results of cyclic strain loading on the critical current of Nb 3 Al strand and mirostructural observation of fracture surface of the filaments is described. Our results show that degradation of critical current properties was not observed at cycle number n = 1500 under the applied axial strain of 0.17%. A noxious sample, from which the outside copper stabilizer was deliberately removed, broke after n = 10, and crack propagation was observed at the fracture surface of the Nb 3 Al filaments. Under a microstructural observation of the break sample, the fracture points of the filaments were seen to be different in a longitudinal direction. A striped pattern like a beach mark due to crack propagation was also observed at the Nb 3 Al fracture surface. It was found that the cross-sectional homogeneity of the strand is important to avoid the damage and breaking from cyclic loading.

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Section: Introductionmentioning

confidence: 80%

“…In the experiments, the maximum number of cyclic strain loading events was n = 1500 considered the condition which cyclically excitation test of ITER conductor n = 1000 [7,9]. Fig.…”

Section: Condition Of Lorentz Force At Cyclic Loadingmentioning

confidence: 99%

Critical Current and Fracture Behavior of Nb3Al Superconducting Strands under Cyclic Electromagnetic Force

Wadayama¹,

Natsume²,

Mito³

et al. 2011

JMSE-A

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show abstract

“…The first instance is an SMES model coil for a small-scale 100 kWh SMES device, which was launched by the Ministry of International Trade and Industry of Japan [7,10,11]. The second and third are the CS insert and Nb 3 Al insert coils, respectively [12][13][14][15][16]. These coils were fabricated and tested by the Japan Atomic Energy Research Institute.…”

Section: Investigation Of Coils Having Long Time Constants and Consismentioning

confidence: 99%

“…The fifth is the inner shaping (IS) coil for the LHD poloidal coil [19,20]. Specifications of these coils are listed in Table 4 [7,[10][11][12][13][14][15][16][17][18][19][20].…”

Section: Investigation Of Coils Having Long Time Constants and Consismentioning

confidence: 99%

Magnetic field measurements of JT-60SA CS model coil

Obana

Takahata

Hamaguchi

et al. 2015

Fusion Engineering and Design

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Fabrication Process Qualification of TF Insert Coil Using Real ITER TF Conductor

Ozeki

Isono

Kawano

et al. 2015

IEEE Trans. Appl. Supercond.

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Development of a Nb3Al Conductor to be Applied to a Fusion Reactor and Its Application to a Large Superconducting Coil

Cited by 7 publications

References 15 publications

Critical Current and Fracture Behavior of Nb3Al Superconducting Strands under Cyclic Electromagnetic Force

Critical Current and Fracture Behavior of Nb3Al Superconducting Strands under Cyclic Electromagnetic Force

Magnetic field measurements of JT-60SA CS model coil

Fabrication Process Qualification of TF Insert Coil Using Real ITER TF Conductor

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