Because of the integral nature of the cable and the chamber in the form of a detector assembly, the experimental determination of the breakdown characteristics was made on the entire assembly. The-results of these tests have been presented in Section TV.

5.6 SUSCEPTIBILITY TO EXTRANEOUS SIGNALS

Because of the. cable processing requirements mentioned earlier in this section, the transmission line that provided the best over-all performance was the stainless steel — quartz — stainless steel configuration, listed as the last item of Table 5-1. Of considerable concern in information transmission systems, especially those information transmission systems associated with the transmission of information about a nuclear device, is the susceptibility of the trans­mission system to extraneous signals and noise. In an attempt to minimize the susceptibility of the transmission system to extraneous electric, magnetic, and electromagnetic fields, the basic cable configuration mentioned above was evaluated with and without additional shields of various’ materials and in various modes of connection. The results obtained on a small sample indicated that the configuration for the best over-all performance was a stainless steel — quartz — stainless steel cable, to which was added two additional copper braids of about 20 mils total thickness.

This cable is then placed in the usual solid-sheath, stainless steel jacket and the resultant cable is called the "prototype” cable. This cable was mentioned previously in Subsection 5. 2.

SECTION VI

N.