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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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. 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. Detonators Nuclear weapon design. When fired, it creates a strong electromagnetic pulsewhich is inductively coupled into one or more defonator coils connected to the bridge wires or slapper foils.
The precise timing of EBWs is achieved by the detonator using direct physical effects of the vaporized bridgewire to initiate detonation detonatlr the detonator’s booster charge. Archived from the original PDF on October 6, Low- impedance capacitors and low-impedance coaxial cables are required to achieve the necessary current rise rate. An EBW has two main parts: 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.
The EBW and the slapper detonator are the safest known types of detonators, as only a very high-current fast-rise pulse can successfully trigger them.
This page was last edited on 31 Octoberat However, there is still not a universally accepted mechanism. The time precision and consistency of EBWs 0.
Exploding-bridgewire detonator – Wikipedia
Their use is limited by the thermal stability range of PETN. Modern exploding-bridgewire detonators arranged in a tray. Retrieved from ” https: Exploding Bridgewire EBW Detonators are in widespread use and have proven reliability and performance characteristics. EBWs have found uses outside nuclear weapons, such as the Titan IV safety detonatoor applications where stray electrical currents might detonate normal blasting ebq, and applications requiring very precise timing for multiple point commercial blasting in mines or quarries.
Two EBW arms circled in light green. Detonator wires highlighted in yellow. From Wikipedia, the free encyclopedia.
Booster charge circled in green. EBWs use a different physical mechanism than blasting caps, using more electricity delivered much more rapidly, and explode in a much more precise timing after the electric current is applied, by the process of exploding wire detnoator. In a fission bomb, the same or similar circuit is used for powering the neutron triggerthe initial source of fission neutrons.
RP-1 EBW Detonator
This is roughly 1, to 10, times longer and less precise than the EBW electrical vaporization. The results eb the experimental work will be presented, together with the implications for the initiation mechanism of PETN in an exploding bridgewire detonator.
During initiation, the wire heats with the passing current until melting point is reached. Any further distribution of this work must maintain attribution detonahor the author s and the title of the work, journal citation and DOI.
The heating rate is high enough that the liquid metal has no time to flow away, and heats further until it vaporizes.
Then an electric arc forms in the metal vapor, leading to drop of electrical resistance and sharp growth of the current, quick further heating of the ionized metal vapor, and formation of a shock wave.
Conference SeriesVolumePart Consequently, the detonators must have very precise timing. The heating process typically takes milliseconds to tens of milliseconds to complete and initiate detonation in the primary explosive.
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. 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.
detonattor 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.
If the current rise rate is lower, the bridge may burn, perhaps causing deflagration of the PETN pellet, but it will not cause detonation. E A Lee et al J. Detonators without such booster are called initial pressing detonators IP detonators. EBWs were developed as a means of detonating multiple explosive charges simultaneously, mainly for use in plutonium-based nuclear weapons in deronator a plutonium core called a pit is compressed very rapidly.
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.