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成果報告書詳細
管理番号20180000000214
タイトル*平成29年度中間年報 高温超電導実用化促進技術開発 高磁場マグネットシステム開発 高温超電導高磁場コイル用線材の実用化技術開発(株式会社フジクラ 国立研究開発法人産業技術総合研究所)
公開日2018/6/28
報告書年度2017 - 2017
委託先名株式会社フジクラ 国立研究開発法人産業技術総合研究所
プロジェクト番号P16006
部署名省エネルギー部
和文要約
英文要約As optimization development of enhancing magnetic field characteristics to achieve final target value of "Je ≧ 400 A / mm^ 2 (30 K, 7 T)” in FY 2018, Je ≧ 300 A / mm^2 (30 K, 7 T) at 40m/h line speed which is the target value for FY 2017, the pinning force in the magnetic field of wire with artificial pinning centers introduced into the superconducting layer has been investigated in wide temperature range to solve the issue of achieving the high speed superconducting layer formation. As a result, the critical current density of Je ≧ 300 A / mm^2 has been realized at 30K, 7T, without spoiling production speed of 40m/h. To promote the development to improve its characteristics in the magnetic field conditions at 30 K and 7 T, magnetic field characteristic evaluation device was introduced.
To achieve the final target of critical current distribution less than 0.15 in 1km long wire, improvement by refining the production line and process parameters, which contributed to realize long and high quality for trial production of km-class wire. In solving the issues, some effective equipment installation to the production line was carried out. Regarding the development of mechanical reliability evaluation technology, wire reliability evaluation devices which conducts thermal and dynamic load test in both wire shape and coil shape were introduced and reliability tests were conducted. The enhancement of delamination strength for the superconducting tapes were clearly observed by cumulative failure late evaluation by using thermal stress. The fatigue constants for delamination stress were also evaluated by using tensile stress machines and almost no fatigue propagation observed at liquid nitrogen temperature.
We have numerically investigated the loss power of superconducting tape wires in ramping magnetic fields. It is numerically clarified that striation and twisting of superconducting tapes are effective to reduce the losses of tape wires when superconducting magnets are excited or demagnetized.
Concerning the development of the scribed coated conductors, the plane-plume PLD method was employed for the purpose of the improvement of the uniformity in the Ic-distribution even for the APC-introduced coated conductors. As a result of the optimization of growth conditions in the plane-plume PLD, the filament-Ic distribution of BHO doped EuBCO coated conductors was much improved from 10.4% to 4.3%. Additionally, the dual-beam scribing system was newly constructed to confirm the principle of multi-beam system for realizing higher processing speed. We could make sure no large differences in two scribed lines on the depth and the width.
We measured the total ac loss of the CORC wire carrying ac transport currents in ac transverse magnetic fields. The total loss was dominated by the transport current loss at a low field region, whereas it was dominated by the magnetization loss at a high field region.
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