​​​​RP EBW Detonator​. P/N ​. The RP explosive is contained in a ” thick stainless steel case which is crimped onto the plastic head. OPEN ACCESS. A view on the functioning mechanism of EBW detonators -part 1: electrical characterisation. To cite this article: E A Lee et al J. Phys.: Conf. Exploding Bridgewire (EBW) Detonators are in widespread use and have proven reliability and performance characteristics. Since their invention there have.

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A view on the functioning mechanism of EBW detonators -part 1: electrical characterisation

EBWs were developed as a means of detonating multiple explosive charges simultaneously, mainly for use in plutonium-based nuclear weapons in which a plutonium core called a pit is compressed very fbw. The precise timing of EBWs is achieved by the detonator using direct physical effects of the vaporized bridgewire to initiate detonation in the detonator’s booster charge.

Detonators without such booster are called initial pressing detonators IP detonators. Primary explosives such as lead azide are very sensitive to static electricity, radio frequency, shock, etc. From Wikipedia, the free encyclopedia. Booster charge circled in green.

RP EBW Detonator

The measurement of current, time to bridgewire burst and the transient voltage across the bridgewire at burst have enabled the determination of the energy used in bursting the bridgewire. Two EBW arms circled in light green. Conventional blasting caps use electricity to heat a bridge wire rather than vaporize it, and that heating then causes the primary explosive to detonate.


Retrieved July 14, By using this site, you agree to the Terms of Use and Privacy Policy. E A Lee et al J. However, there is still not a universally accepted mechanism. The most common commercial wire size is 0.

The resulting shock and heat initiate the eetonator explosive. The slapper detonator is a more recent development along similar lines. Buy this article in print.

Any further deyonator of this work must maintain attribution to the author s and the title of the work, journal citation and DOI. A very rough approximation for the capacitor is a rating of 5 kilovolts and 1 microfarad, and the peak current ranges between and amperes. From the available explosives, only PETN at low densities can be initiated by sufficiently low shock to make its use practical in commercial systems as a part of the EBW initiator.

In a fission bomb, the same or similar circuit is used for powering the neutron triggerthe initial source of fission neutrons.

Exploding-bridgewire detonator

Their use is limited by the thermal stability range of PETN. The results of the experimental work will be presented, together with the implications for the initiation mechanism of PETN in an exploding bridgewire detonator.

This is roughly 1, to 10, times longer and less precise than the EBW electrical vaporization. Detonators Nuclear weapon design. Low- impedance capacitors and low-impedance coaxial cables are required to achieve the necessary detonayor rise rate. Content from this work may be used under the terms of the Creative Commons Attribution 3. During this phase the electrical resistance of the bridgewire assembly rises.


This accounts ebww the heavy cables seen in photos of the Trinity ” Gadget “; high voltage cable requires good insulation and they had to deliver a large current with little voltage drop, lest the EBW not achieve the phase transition quickly enough. However, they require a bulky power source for the current surges required.

Views Read Edit View history. When the wire is connected across this voltage, the resulting high current melts and then vaporizes the wire in a few microseconds.

Given a sufficiently high and well known amount of electric current and voltage, the timing of the bridgewire vaporization is both extremely short a few microseconds and extremely precise and predictable standard deviation of time to detonate as low as a few tens of nanoseconds. This site uses cookies.

Conference SeriesVolumePart Then an electric arc forms in the metal vapor, leading to drop of electrical resistance and sharp growth of the detonattor, quick further heating of the ionized metal vapor, and formation of a shock wave.