超伝導線の局所的不安定性を考慮したクエンチ発生・伝搬に関する研究

考虑超导线局部不稳定性的失超产生和传播研究

• 批准号: 08750327
• 负责人: 早川 直樹
• 金额: $ 0.7万
• 依托单位: Nagoya University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Encouragement of Young Scientists (A)
• 财政年份: 1996
• 资助国家: 日本
• 起止时间: 1996 至 无数据
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08750327/
• 关键词: 超伝導線; 液体ヘリウム; クエンチ; 弱点破壊; ワイブル統計解析; 局所的不安定性; 前駆現象; 高速度ビデオ

本研究では,超伝導線のクエンチ現象を種々の弱点による局所的不安定性に起因する確率的現象としてとらえ,クエンチ電流値のばらつきに関する統計的解析を行うとともに,クエンチ前駆現象の電気的・光学的同時観測を行った.本研究によって得られた知見を以下にまとめて示す.1.交流用超伝導線のクエンチ電流値を同一実験条件下において繰り返し測定し,そのばらつきを弱点破壊理論に基づくワイブル統計解析によって評価した.その結果,クエンチ電流値のワイブルプロットが混合ワイプル分布型となる場合があることから,超伝導線にはばらつきの小さい本質的な弱点と,ばらつきの大きい別種の弱点とが混在している可能性を示唆した.2.クエンチ時のジュール発熱に伴う液体ヘリウム中の気泡の発生状況について,高速度ビデオを用いて高時間分解観測した.その結果,超伝導線上の局所的領域から液体ヘリウムの核沸騰が観測され,その挙動からクエンチの前駆現象であると推測した.3.高速度ビデオで観測した液体ヘリウムの局所的擾乱について,画像処理技術を用いて定量的に検討した.クエンチの光学的測定と電気的測定との同期を取ることにより,液体ヘリウムの局所的擾乱が超伝導線に沿った膜沸騰状態の気泡へ成長する過程を明確化した.4.超伝導コイルにおけるクエンチ試験から,クエンチ発生個所を電気的・光学的に標定した.その結果,クエンチ発生個所は通電電流による自己磁界の高いコイル両端部以外にも分散しており,クエンチが確率的現象であることを裏付けた.

The purpose of this study is to analyze the causes of unease caused by many kinds of weaknesses in this study, such as the analysis of the accuracy rate, the analysis of the statistics of the electrical current cycle, and the optical simultaneity of the computer. In this study, I have been informed of the following information. 1. The AC is used as an overload line and current. Under the same condition, the return test is measured, and the weakness is broken. The statistical analysis is based on statistical analysis. The results show that the distribution pattern of mixed current distribution is different from that of others, that is, the distribution pattern of current distribution, the distribution pattern of hybrid equipment, the distribution pattern of mixed current distribution, the distribution pattern of mixed current distribution, the distribution pattern of mixed current distribution, the distribution pattern of mixed current distribution, the distribution pattern of mixed current distribution, the distribution pattern of mixed current distribution, the distribution pattern of mixed current distribution, the distribution pattern of mixed current distribution, the distribution pattern of mixed current distribution, the distribution pattern of mixed current distribution, the distribution pattern of mixed current distribution, the distribution pattern of mixed current distribution, the distribution pattern of mixed current distribution, the distribution pattern of mixed equipment, the distribution pattern of mixed equipment, the distribution pattern of hybrid equipment, the distribution pattern of mixed equipment, the distribution pattern of hybrid equipment, the distribution pattern of mixed equipment, the distribution pattern of hybrid equipment, the distribution pattern of current distribution, the distribution pattern of mixed When the temperature is low, the temperature is low and the temperature is low. According to the results of the test, in the field of the bureau, there are some problems in the field, such as the operation of the liquid, the nuclear power, the temperature, the temperature and the temperature. 3. At a high speed, the liquid is in a mess, and the portrait technology uses a quantitative amount of equipment. During the same period, the determination of the optical and electrical equipment was carried out at the same time, and the chaotic superline of the liquid consumer bureau grew along the thin film boiling state bubble growth process to ensure the accuracy. 4. The superconductor is responsible for the production of an optical standard for the electric power plant. According to the results of the experiment, the current distribution system is distributed outside the end of the magnetic field, and the accuracy rate is similar to that of the payroll system.

项目成果

谷口洋一郎: "交流用超電導線のクエンチに伴う液体ヘリウムの局所的擾乱" 電気学会全国大会. (発表予定). (1997)

Yoichiro Taniguchi：“交流超导线淬火造成的液氦局部扰动”，日本电气工程师学会全国会议（预定报告）（1997 年）。