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成果報告書詳細
管理番号20170000000376
タイトル*平成28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 高温超電導高安定磁場マグネットシステム技術開発(三菱電機株式会社)
公開日2017/7/6
報告書年度2016 - 2016
委託先名三菱電機株式会社
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Title:Fundamental Commercialization Promote Technological Development of the High Temperature Superconducting. Development of High Magnetic Field Magnet System. Development of High Stable Magnetic Field HTS Magnet System Technology. (FY2016-FY2020)FY2016 Annual Report

1) The commercial technological development of HTS coils
 The winding technology for 1 m-class HTS coils is established: the HTS wire is wound with the accuracy of within 0.1 mm in the radial direction. The yield rate (proportion of non-defective coils to total coils) was estimated with superconducting characteristics of the manufactured coils.
 The fifty single-pancake coils were manufactured this year. The winding accuracy of within 0.1 mm was achieved with adjusting the coil diameter by a measurement of laser displacement meter. The electrical transport characteristics (critical current and splice resistance) of the coils were evaluated at 77.3 K. The yield rate increased to over 90% by adopting the Cu-plating HTS wires.
 The magnetization effect of HTS wire on the one-third model coil was evaluated with the magnetic field stability measured by a NMR probe. The magnetic field change of 300 ppm/10 minutes was observed; it improved to 1 ppm/h with the over-shooting of the transport current.
2) The optimization technological development of HTS magnet system
 The half-scale three-tesla HTS magnet with active-shield coils was designed to demonstrate the application of HTS technologies to MRI magnets. The magnet consists of the main coils with inner-diameter of 560 mm and the shield coils with outer-diameter of 1200 mm. The main coils generate the main magnetic field and the shield coils reduce the magnetic field leak. The axial length of the magnet is about 1000 mm and the designed magnetic field distribution is 1.7 ppm/250 mmφ. The rated current is 148 A, the rated central magnetic field is 2.9 T, and the stored energy is about 1.6 MJ when imaging. The required amount of HTS wires is about 70 km. The maximum axial and radial stress at the rated excitation is 30 MPa and 55 MPa, respectively.
 The separated power supply system was evaluated: the excitation and holding power supplies are switched according to the magnet operation mode. This system contributed to 40% of energy saving and improved the magnetic field stability to less than 0.7 ppm/h.
3) The development of coil protection and burnout measures methods
 The coil protection at drive-mode operation was discussed. The transport current tests were conducted for the HTS wires with local degradation to grasp the quench characteristics and derive the abnormality detecting conditions. Furthermore, electrical propagation behavior for quenched area was numerically investigated.
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