'special jet engine'; American codename: Joe 4) was the first Soviet attempted test of a thermonuclear weapon that occurred on August 12, 1953, that detonated with an energy equivalent to 400 kilotons of TNT.
[2] The assumption was that the deuterium tritium mixture could be easily heated and compressed, and the shock would start the thermonuclear reaction prematurely.
In April 1949 the group received D + T cross section data obtained from intelligence gathering without mentioning the source.
[5] After the United States tested Ivy Mike in November 1952, Lavrentiy Beria sent a memo to spare no effort on the development of the RDS-6s.
[13] Despite the inability of the RDS-6s to be scaled into the megaton range, the detonation was still used by Soviet diplomats as leverage.
The Soviets claimed that they too had a hydrogen bomb, but unlike the United States' first thermonuclear device, theirs was deployable by air.
[14] The United States didn't develop a deployable version of the hydrogen bomb until five months after the RDS-6s test, in 1954.
[citation needed][A 1] The first Soviet test of a "true" hydrogen bomb was on November 22, 1955, under the directive of Nikolai Bulganin (influenced by Nikita Khrushchev), code-named RDS-37.