UGT noise minimization techniques. Final report Apr--Nov 76

Technical Report · Tue Nov 30 04:00:00 EST 1976

OSTI ID:6625799

Smyth, J B; van Lint, V A.J.; Messler, M A

The high-intensity radiation delivered by a nuclear explosion during an underground test produces large, fast current pulses on conductors and in the earth as a direct result of the interaction of the fast radiation pulse with the earth and test configuration. These currents can produce transient voltages in experiment measuring circuits that interfere seriously with the experiments to be performed. Experimenters have dealt with such interference by combinations of electrical and radiation shielding, grounding or electrical isolation, filtering, modulating and demodulating. The following grounding and cabling practices are preferred: (1) the cables should be enclosed in a conducting shield (zipper tube or pipe) until the cable run escapes from the radiation field and the electric field induced in the tunnel air and wall. This shield should be earth grounded at its end. (2) The uphole cables should have their outer shields shorted together at the gas seal bulkhead, alcove splice rack and mesa splice rack. (3) The transfer impedance for low-noise experiments should be minimized by using solid-shield cables and conducting foil bridges over connectors. (4) Electrically pulsing the transmission line between cable shields and enclosing shield (e. g., zipper) is an effective means of quality control on the transfer impedance. (5) The direct photon-induced cable currents should be minimized by using radiation shielding and solid-dielectric cables in the irradiated region.

• Research Organization: Mission Research Corp., La Jolla, CA (USA)
• OSTI ID: 6625799
• Report Number(s): AD-A-050772; MRC/SD-R-7
• Country of Publication: United States
• Language: English

Related Subjects

440200* -- Radiation Effects on Instrument Components
Instruments
or Electronic Systems
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
CABLES
CONDUCTOR DEVICES
ELECTRIC CABLES
ELECTRIC GROUNDS
ELECTRIC IMPEDANCE
ELECTRICAL EQUIPMENT
ELECTROMAGNETIC PULSES
ELECTROMAGNETIC RADIATION
ELECTRONIC CIRCUITS
EQUIPMENT
HARDENING
IMPEDANCE
NOISE
OVERCURRENT
OVERVOLTAGE
PHYSICAL RADIATION EFFECTS
RADIATION EFFECTS
RADIATION HARDENING
RADIATIONS
SHIELDING
TRANSIENTS