Computational proposal for locating local defects in superconducting tapes

The purpose of this study is to simulate scanning laser microscopy (SLM) experiments: a line laser, a spot laser and hybrid lasers which combined both the line and spot laser with a computer program. Superconducting paths on a two dimensional normal state conductor are modeled. Three different superconducting path patterns are set on each film conductor. The film conductors are examined by the scanning lasers one by one, and potential responses through the film conductors are computer simulated.;The simulation program is developed for Kirchoff's laws with position-dependent resistivity. A system of linear equations for the entire electric circuit is built and solved using an iterative and a matrix method. One thousand iterations and the LU decomposition with Crout algorithm are performed in the numerical and matrix calculation, respectively.;The results show that the line laser across the film conductor detects junctions and the main trunk of the superconducting paths. The hot spot laser can find the exact location of the trunk of the superconducting paths, however; there is no response on any branches. The hybrid laser technique where both the line and spot laser are used simultaneously shows the exact path location, including the trunk and branches.