​​​​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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Deetonator is achieved via conventional explosives placed uniformly around the pit. Sign up for new issue notifications. Archived from the original PDF on October 6, Detonator wires highlighted in yellow. 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 ewb compressed very rapidly.

This in turn has led to the calculation of the energy efficiency of the fireset bridgewire system and an estimate of the energy delivered post bridgewire burst.

Since their invention there have been numerous studies to identify the mechanism by which the exploding bridgewire initiates the explosive. The slapper detonator is a more recent development along similar lines. EBWs use a different physical mechanism than blasting caps, using more electricity delivered ebbw more rapidly, and explode in a much more precise timing after the electric current is applied, by the process of exploding wire method.

Exploding-bridgewire detonator – Wikipedia

The implosion must be highly symmetrical or the plutonium would simply be ejected at the low-pressure points. However, detnoator is still not a universally accepted mechanism.

The exploding-bridgewire detonator EBWalso known as exploding wire detonator is a type of detonator used to initiate the detonation reaction in explosive materialssimilar to a blasting cap because it is fired using an electric current. Exploding Bridgewire EBW Detonators are in widespread use and have proven reliability and performance characteristics.

To find out more, see our Privacy and Cookies policy. Retrieved July 14, The heating process typically takes milliseconds to tens of milliseconds to complete and initiate detonation xetonator the primary explosive.

Exploding-bridgewire detonator

This accounts for 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. The Fat Man Model EBW detonators used an unusual, high reliability detonator system with two EBW “horns” attached to a single booster charge, which then fired each of the 32 explosive lens units.


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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. By using this site, you agree to the Terms of Use and Privacy Policy. A very rough approximation for the capacitor is a rating of 5 kilovolts and 1 microfarad, and the peak current ranges between ddetonator amperes.

RP EBW Detonator

Any further distribution of this work must rbw attribution to the author s and the title of the work, journal citation and DOI. This site uses cookies. Conventional blasting caps use electricity to heat a bridge wire rather than vaporize it, and that heating then causes the primary explosive to detonate. When fired, it creates a strong electromagnetic pulsewhich is inductively coupled into one or more secondary coils connected to the bridge wires or slapper foils. The heating rate is high enough that the liquid metal has no time to flow away, and heats further until it vaporizes.

During this phase the electrical resistance of the bridgewire assembly rises. During initiation, the wire heats with detonatod passing current until melting point is reached. The larger round objects with two wires coming out parallel to the surface are diagnostic equipment.

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

The precise timing of EBWs is achieved by the detonator detonqtor direct physical effects of the vaporized bridgewire to initiate detonation in the detonator’s booster charge. Imprecise contact between the bridgewire and the primary explosive changes how quickly the explosive is heated up, and minor electrical variations in the wire or leads will change how quickly it heats up as well.

Primary explosives such as lead azide are very sensitive to static electricity, radio frequency, shock, etc.

In the US, due to their common use in nuclear weapons, these devices are subject to the nuclear control authorities in every state, according to the Guidelines for the Export of Nuclear Material, Equipment and Technology. The EBW and the slapper detonator are the safest known ew of detonators, as only a very high-current fast-rise pulse can successfully trigger them.


The dettonator of current, time to bridgewire burst and the transient voltage across the bridgewire at burst have enabled the determination of the energy detonato in bursting the bridgewire. The most common commercial wire size is 0. From Wikipedia, the free encyclopedia. This is roughly 1, to 10, times longer and less precise than the EBW electrical vaporization. Two EBW arms circled in light green. Retrieved from ” https: To achieve the melting and subsequent vaporizing of the wire in time sufficiently short to create a shock wave, a current rise rate of at least amperes per microsecond is required.

A low energy density capacitor equivalent to a compression generator cetonator be roughly the size of a soda can. Their use is limited by the thermal stability range of PETN. Booster charge circled in green.

detonxtor This has led to their common use in nuclear weapons. Detonators Nuclear weapon design. In a fission bomb, the same or similar circuit is used for powering the neutron triggerthe initial source of fission neutrons.

Modern exploding-bridgewire detonators arranged in a tray. The time precision and consistency of EBWs 0. Since explosives detonate at typically 7—8 kilometers per second, or 7—8 meters per millisecond, a 1 millisecond delay in detonation from one side of a nuclear weapon to the other would be longer than the time the detonation would take to cross the weapon.

The results of the experimental work will be presented, together with the implications for the initiation mechanism of PETN in an exploding bridgewire detonator. Given a detonstor 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. Views Read Edit View history. However, they require a bulky power source for the current surges required.