STUDY OF TRAPPED MAGNETIC FLUX IN SUPERCONDUCTING NIOBIUM SAMPLES
STUDY OF TRAPPED MAGNETIC FLUX IN SUPERCONDUCTING NIOBIUM SAMPLES
复制标题
超导铌样品中俘获磁通量的研究
DOI：
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发表时间：
2011
期刊：
影响因子：
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通讯作者：
J. Knobloch
中科院分区：
文献类型：
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作者：
S. Aull;O. Kugeler;J. Knobloch
众所周知，俘获磁通是块状铌 SRF 腔中残余损耗的原因之一。在迈斯纳状态下，周围磁场应从材料中排出。晶格缺陷或杂质等扰动具有抑制超导转变期间外部场的排出的能力，从而使场被俘获。我们测量了具有不同处理历史（例如 BCP 和回火）的铌样品中俘获磁通量的分数。研究了单晶和多晶材料之间的差异以及空间温度梯度和不同冷却速率的影响。此外，还研究了预热期间捕获场的释放过程。
Trapped magneticflux is knownto be one cause of residual losses in bulk niobium SRF cavities. In the Meissner state an ambient magnetic field should be expelled from the material. Disturbances such as lattice defects or impurities have the ability to inhibit the expulsion of an external field during the superconducting transition so that the field is trapped. We measured the fraction of trapped magnetic flux in niobium samples with different treatment histories, such as BCP andtempering. Thedifferencesbetweensingle crystal and polycrystalline material as well as the influence of spatial temperature gradients and different cooling rates were investigated. In addition, the progression of the release of a trapped field during warm up was studied.