Results of r.f. noise coupling tests done in building 141

TL;DRAbstract

As part of the lightning protection plan at the Pantex plant, coupling measurements were made by LLNL to determine the transfer functions of the work areas (cell or bay). From these measured transfer functions the susceptibility of the cell to a lightning strike can be determined, and the appropriate mitigating measures put into effect. The transfer functions are determined by injecting a current on the outside of the cell and measuring the electric field inside. The ratio of electric field to the injected current over a broad frequency range is the transfer function. During one of our tests a comparison of LLNL and SNLA instrumentation was done. The major difference in the systems was that the SNLA system used batteries for power and a fiber optic link to decouple the antenna from the receiver. LLNL used AC power and a cable for the antenna connection. The comparison showed a discrepancy between LLNL and SNLA results. The source of this error was unwanted signal (noise) coupling into

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