Field dependence of the n-value and its relation with the critical current of Nb3Sn strands
Field dependence of the n-value and its relation with the critical current of Nb3Sn strands
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DOI：
10.1088/0953-2048/20/8/022
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发表时间：
2007-08
影响因子：
3.6
通讯作者：
Sangjun Oh;Chulhee Lee;K. Cho;Keeman Kim;D. Uglietti;R. Flükiger
中科院分区：
文献类型：
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作者：
Sangjun Oh;Chulhee Lee;K. Cho;Keeman Kim;D. Uglietti;R. Flükiger
我们找到了一个简单的表达场的依赖性的n值的Nb3Sn股，它给出了合理的拟合经验数据。还发现，n值和临界电流之间的关系，这是从一个假设的减少磁通线晶格剪切钉扎力由于热激活，可以描述的领域依赖性的临界电流。利用n值与临界电流之间的关系，我们提出了一个标度律，我们称之为包括热激活的克雷默模型。结果表明，所提出的标度律可以解释在4.2 K的临界电流数据，即使在高场附近的上临界场。并与Ekin的应变标度律进行了比较。
We find a simple expression for the field dependences of the n-value for Nb3Sn strands which gives reasonable fits to empirical data. It is also found that a relationship between the n-value and the critical current, which is obtained from an assumed reduction of the flux line lattice shearing pinning force due to thermal activation, can describe the field dependence of the critical current. Using the relation between the n-value and the critical current, we propose a scaling law which we have called the Kramer model including thermal activation. It is shown that the proposed scaling law can explain the critical current data at 4.2 K, even at high field near the upper critical field. It is also compared with Ekin’s strain scaling law.