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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RP-1 EBW Detonator
detobator Their use is limited by the thermal stability range of PETN. Consequently, the detonators must have very precise timing. Modern exploding-bridgewire detonators arranged in a tray. Detonator wires highlighted in yellow. A very rough approximation for the capacitor is a rating of 5 kilovolts and 1 microfarad, and the peak current ranges between and amperes. Archived from the original PDF on October 6, The larger round objects with two wires coming out parallel to the surface are diagnostic equipment.
This is sufficiently precise for very low tolerance applications such as nuclear weapon explosive lenses. Closeup with EBW highlighted. 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.
This has led to their common detonatoe in nuclear weapons. During this phase the electrical resistance of the bridgewire assembly rises.
The slapper detonator is a more recent development along similar lines. Sign up for new issue notifications. EBWs have found uses outside nuclear weapons, such as the Titan IV safety conscious applications where stray electrical currents might detonate normal blasting caps, and applications requiring very precise timing for multiple point commercial blasting in mines or quarries. Conventional blasting caps use electricity to heat a bridge wire rather than vaporize it, and that heating then causes the primary explosive to detonate.
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 rapidly.
However, there is still not a universally accepted mechanism. During initiation, the wire heats with the passing current until melting point is reached.
A view on the functioning mechanism of EBW detonators -part 1: electrical characterisation
An EBW has two main parts: This accounts for the heavy cables seen enw 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 heating process typically takes milliseconds to tens of milliseconds to complete and initiate detonation in the primary explosive. Detonators without such booster are called initial pressing detonators IP detonators. The Fat Man Model EBW detonators used an unusual, high reliability detonator setonator with two EBW “horns” attached to a single booster charge, which then fired each of the 32 explosive lens units.
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. In a fission bomb, the same or similar circuit is used for powering the neutron triggerthe initial source of fission neutrons.
Since explosives detonate at typically 7—8 kilometers per second, or 7—8 meters per millisecond, a 1 millisecond delay in detonation vetonator one side of a nuclear weapon to the other would be longer than the time the detonation would take to cross the weapon.
The flux compression generator is one alternative to capacitors.
Since their invention there have been numerous studies to identify the mechanism by which the exploding bridgewire initiates the explosive. This page was last edited on 31 Octoberat 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.