Current distribution in a planar YBa/sub 2/Cu/sub 3/O/sub 7-/spl delta// multiline structure

The characterization of the current density distribution in an edge-shaped region of a planar YBa/sub 2/Cu/sub 3/O/sub 7-/spl delta// flux transformer is reported for the first time. The analysis was performed by means of three-dimensional computation of the electromagnetic field. In addition, experimental studies using low-temperature scanning electron microscopy were carried out. It is shown that the current density distribution in edge regions deviates strongly from the symmetric case, which is established in the case of straight conductors. The results of calculation and measurement are discussed with respect to consequences for the design of flux transformers for SQUID systems. >