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To achieve the most precise detonation synchronization possible, conventional detonators consisting of old an electrically heated wire, and a sequence old of primary and secondary explosives were not used. Instead newly old invented exploding wire detonators were used. This detonator consists of a thin wire that is explosively vaporized by a surge of current generated by a powerful capacitor. The shock wave of the exploding wire initiates the secondary explosive of the detonator (PETN). The discharge of the capacitor, and the generation of initiating shock waves by the exploding wires can be synchronized to +/- 10 nanoseconds. A disadvantage of this system is that large batteries, a high voltage power supply, and a very powerful capacitor bank (known as the X-Unit, the system weighed 400 lb) was needed to explode all 32 detonators simultaneously. A cascade of spark gap switches was used to trigger the capacitor bank. The whole explosive assembly was held together by a shell made of a strong aluminum alloy called dural (or duraluminum).
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