<Tr> <Th_colspan="2"> Test chronology </Th> </Tr> <Tr> <Td_colspan="2"> Ivy King → </Td> </Tr> <P> Ivy Mike was the codename given to the first test of a full - scale thermonuclear device, in which part of the explosive yield comes from nuclear fusion . It was detonated on November 1, 1952 by the United States on the island of Elugelab in Enewetak Atoll, in the Pacific Ocean, as part of Operation Ivy . It was the first full test of the Teller--Ulam design, a staged fusion device . </P> <P> Due to its physical size and fusion fuel type (cryogenic liquid deuterium), the Mike device was not suitable for use as a deliverable weapon; it was intended as an extremely conservative proof of concept experiment to validate the concepts used for multi-megaton detonations . A simplified and lightened bomb version (the EC - 16) was prepared and scheduled to be tested in operation Castle Yankee, as a backup in case the non-cryogenic "Shrimp" fusion device (tested in Castle Bravo) failed to work; that test was cancelled when the Bravo device was tested successfully, making the cryogenic designs obsolete . </P>

When did the us detonate the first hydrogen bomb