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For|the ska punk band|Operation Ivy (band)Infobox Nuclear weapons test|name = Operation Ivy|picture = IvyMike2.jpg|picture_description = Ivy Mike|country = United States|test_site = Pacific Proving Grounds |period = November 1952|number_of_tests = 2|test_type = Atmospheric tests|device_type = Thermonuclear (Mike) Fission (King)|max_yield = 10.4 Mt|previous_test = Operation Tumbler-Snapper |next_test = Operation Upshot-Knothole Operation Ivy was the eighth series of American Nuclear testing|nuclear tests , coming after Operation Tumbler-Snapper|Tumbler-Snapper and before Operation Upshot-Knothole|Upshot-Knothole . Its purpose was to help upgrade the U.S. arsenal of nuclear weapon s in response to the Soviet nuclear weapons program. The two explosions were staged in late 1952 at Enewetak Atoll in the Pacific Proving Ground in the Marshall Islands .
The first Ivy shot, Ivy Mike|Mike , was the first successful full-scale test of a multi-megaton thermonuclear weapon ("hydrogen bomb") using the Teller-Ulam design . Unlike later thermonuclear weapons, Mike used deuterium as its fusion fuel, maintained as a liquid by an expensive and cumbersome cryogenic system. It was detonated on Elugelab|Elugelab Island yielding 10.4 TNT equivalent|megatons , almost 500 times the bomb dropped on Nagasaki, Nagasaki|Nagasaki . 8 megatons of the yield was from fast fission of the uranium tamper, creating massive amounts of radioactive fallout. The detonation left an underwater crater 6,240& nbsp;ft (1.9& nbsp;km) wide and 164& nbsp;ft (50 m) deep where Elugelab Island had been. Following this successful test, the Mike design was weaponized as either the Mark 16 nuclear bomb|EC-16 or TX-16 , but it was quickly abandoned for solid-fueled designs after the success of the Castle Bravo shot.
The second test, Ivy King|King , fired the largest nuclear weapon to date using only nuclear fission (no fusion nor boosted fission weapon|fusion boosting ). This "Super Enriched uranium|Oralloy Bomb" was intended as a backup if the fusion weapon failed. King yielded 500 kilotons, 25-40 times more than the nuclear weapons dropped during World War II .
Jimmy P. Robinson, http://www.airspacemag.com/history-of-flight/Into-the-Mushroom-Cloud.html? c=y& page=3 a USAF captain, was lost while piloting his F-84 Thunderjet|F-84G through the mushroom cloud to collect air samples; he ran out of fuel and attempted to land on water but was never found. http://www.arlingtoncemetery.net/jprobinson.htm
