Radiation-Induced Signals in Cables

A model is presented for the calculation of radiation-induced signals in multiconductor electrical cables. The model employs a Monte Carlo method for the calculation of the radiation-driven charge displacement within the cable and a Green's function to translate charge displacement into induced currents on conductors. The model, which is applicable to cables of arbitrary cross-sectional geometry and material configuration, permits consistent treatment of such effects as gaps, residual air, spatially-dependent transient conductivity arising from dose enhancement, saturation, and polarization-effects. These effects have, by improper treatment or neglect, limited the applicability and accuracy of previous models. Results are presented demonstrating the effects of gaps, residual air, dose enhancement, and dielectric liners and illustrating the distribution of signals on many-conductor cables.