Design of the TF Coil for a Tokamak Fusion Power Reactor with YBCO Tape Superconductors
Design of the TF Coil for a Tokamak Fusion Power Reactor with YBCO Tape Superconductors
复制标题
YBCO带状超导托卡马克聚变反应堆TF线圈的设计
DOI：
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发表时间：
2005
期刊：
影响因子：
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通讯作者：
S. Nishio
中科院分区：
文献类型：
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作者：
T. Ando;S. Nishio
日本原子能研究所(JAERI)设计了一种低长宽比托卡马克矢量，以提供商业动力反应堆所需的高性价比。环形磁场线圈绕组内的最大磁场约为20T。考虑了高温超导YBCO带对环形磁场线圈导体的适用性。众所周知，YBCO带材具有较高的临界电流密度。然而，由于磁通跳跃，YBCO带材存在磁不稳定性。在33K时，发生第一次磁通跳跃的磁场估计为6.8T。因此，为了防止磁通跳跃，绕组被分成三个(高、中、低场)绕组，每个绕组产生的最大自磁场小于6.8T。低场绕组首先冷却到33K，然后运行到其额定电流。在这种情况下，中场和高场卷绕组件保持在90K以上。接下来，在类似的过程中操作中间组件。最后，运行更高的组件，在没有磁通跳跃的情况下产生20T。每个绕组的额定电流为40kA。因此，YBCO带材在TF线圈中的应用是可能的，YBCO带材有望在实现低建造和运行成本的托克马克聚变功率堆和高性能等离子体方面发挥重要作用
A low aspect ratio tokamak, VECTOR was designed by Japan Atomic Energy Research Institute (JAERI) to provide the high cost performance necessary for a commercial power reactor. The maximum magnetic field within the winding of the toroidal field (TF) coil is about 20 T. The applicability of high temperature superconductor YBCO tape to the TF coil conductor is considered. YBCO tape is well known to have higher critical current density. However, YBCO tape has magnetic instability due to flux jumps. The magnetic field at which the first flux jump occurs is estimated to be 6.8 T at 33 K. Therefore, to prevent flux jumps, the winding is divided into three (higher, middle and lower field) winding packs and the maximum self magnetic field produced by each winding pack is less than 6.8 T. The low field winding pack is cooled first down to 33 K and operated up to its nominal current. In this case, the middle and higher field winding packs are maintained above 90 K. Next, in similar process the middle pack is operated. Finally, the higher pack is operated, and 20 T is generated without flux jump. The nominal current for every winding pack is 40 kA. Thus it is possible to apply YBCO tape to the TF coil and YBCO tape will be expected to play an important role in the realization of tokomak fusion power reactors with low construction and operation costs, and high performance plasma