ROEBEL Assembled Coated Conductors (RACC): Preparation, Properties and Progress
ROEBEL Assembled Coated Conductors (RACC): Preparation, Properties and Progress
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DOI：
10.1109/tasc.2007.899417
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发表时间：
2007-07
影响因子：
1.8
通讯作者：
W. Goldacker;A. Frank;R. Heller;S. Schlachter;B. Ringsdorf;K. Weiss;C. Schmidt;S. Schuller
中科院分区：
文献类型：
--
作者：
W. Goldacker;A. Frank;R. Heller;S. Schlachter;B. Ringsdorf;K. Weiss;C. Schmidt;S. Schuller
RBCO(R=Y或稀土元素)涂层导体(CC)是未来中高温(40-50K)运行的强场线圈最有前途的高温超导材料。计划为第二代聚变反应堆(演示，“演示器”)及以后的反应堆提供线圈。大电流(Ka级)低交流损耗电缆的ROEBEL线棒概念是最适合用于磁铁绕组导线的组装技术，因为它具有扁平的矩形截面。目前的RACC-CABLE技术(RACC=ROEBEL装配涂层导体)将磁带预成型为具有ROEBEL特有的曲折几何形状的线束。CC通常非常好的弯曲性能支持RACC电缆的组装过程。我们报道了一种16股RACC电缆，换位长度为19 cm，由商业供应商SuperPower的CC材料制成，在77K(Jeng=11.3kAcm-2)时达到了1020A的传输临界电流。研究了原始的YBCO带材和成型的线束的基本性能，如取向和场相关的传输电流、电流的均匀性和弯曲效应，并与RACC电缆的测量性能进行了关联。通过采用适合特定RACC电缆几何形状的模型计算自场效应，特别是考虑了电缆中的电流分布，定量地解释了电缆中电流减少30%的原因。
RBCO (R = Y or rare earth element) coated conductors (CC) are the most promising HTS materials for future high field coils operated at moderately high temperature (40-50 K). Coils are planned for the second generation of fusion reactors (DEMO, "DEMOnstrator") and beyond. A ROEBEL bar concept for a high current (kA-class) low AC loss cable is the most suitable assembling technique for conductors in magnet windings due to the flat rectangular cross section. The presented RACC-cable technique (RACC=ROEBEL assembled coated conductors) works with pre-shaping of tapes into strands with the ROEBEL specific meander geometry. The usually very good bending properties of the CC support the assembling procedure of the RACC-cable. We report on a 16 strand RACC-cable with 19 cm transposition length made from CC material from the commercial supplier SuperPower which reached 1020 A transport critical current at 77 K (Jeng = 11.3 kAcm-2). The basic properties of the virgin YBCO tapes and the shaped strands like orientation and field dependent transport currents, current homogeneity and bending effects, were investigated and correlated with the measured properties of the RACC-cable. Calculation of the self field effects by means of a model adapted to the specific RACC-cable geometry and in particular taking into account the current distribution in the cable, explained the 30% current reduction in the cable quantitatively.