- Ivy King
Ivy King was the largest pure fission nuclear bomb ever tested by the United States. The bomb was tested during the Truman administration as part of
Operation Ivy . This series of tests involved the development of very powerful nuclear weapons in response to the nuclear weapons program of theSoviet Union .The production of Ivy King was hurried so it would be ready if its sister project,
Ivy Mike , failed in its attempt to achieve a thermonuclear reaction. The Ivy King test actually took place two weeks after Mike. Unlike the Mike bomb, the Ivy King device could theoretically have been added to United States' nuclear arsenal because it was designed to be air-deliverable.On
November 16 ,1952 at 11:30 local time (23:30 GMT) a B-36H bomber dropped the bomb over a point 2,000 feet (610 m) north of Runit Island in theEnewetak atoll, resulting in a 500 kiloton explosion at 1480 feet (450 m).The Ivy King bomb, designated as a Mk-18 bomb and named the "Super Oralloy Bomb", was a modified version of the Mk-6D bomb. Instead of using an implosion system similar to the Mk-6D, it used a 92 point implosion system initially developed for the Mk-13. Its
uranium -plutonium core was replaced by 60kg of highly enriched uranium (HEU) fashioned into a thin-walled sphere equivalent to approximately four critical masses. The thin-walled sphere was a commonly used design which ensured that the fissile material remained sub-critical until imploded. The HEU sphere was then enclosed in a natural uranium tamper. To physically prevent the HEU sphere collapsing into a critical condition if the surrounding explosives were detonated, or if the sphere was crushed following an aircraft accident, the hollow centre was filled with a chain made fromaluminium andboron which was pulled out to arm the bomb. The boron coated chain also absorbed theneutron s needed to drive the nuclear reaction.The primary designer of the Super Oralloy Bomb, physicist
Ted Taylor , later became a vocal proponent of nuclear disarmament.References
*
* Chuck Hansen (1995) "Swords of Armageddon." Published on CD-Rom only by Chukelea, Sunnyvale, CA.External links
* [http://nuclearweaponarchive.org/Usa/Tests/Ivy.html Operation Ivy]
* Video of the [http://www.sonicbomb.com/modules.php?name=Content&pa=showpage&pid=58 Ivy King Nuclear Test]
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