Abstract
The effective inter-pad distance of low gain avalanche detector prototypes for ATLAS-HGTD from two producers were investigated. The dependence of the effective inter-pad distance on bias voltage and fluence was systematically measured with Transient Current Technique using different laser wavelengths. Bending of the electric field lines at the edges of the electrodes was found to be the reason for the difference between measured and nominal inter-pad distances. The effective inter-pad distances were also simulated and compared to the measurements.
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