Joe 4

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The first (albeit not "true") Soviet Hydrogen ("Super") Test, dubbed Joe 4

Joe 4 (Warhead name: RDS-6s (Reaktivnyi Dvigatel Stalina; Stalin's Rocket Engine)) was an American nickname for the first Soviet test of a thermonuclear weapon and was on August 12, 1953. It was not a "true" hydrogen bomb—it was similar to a "boosted" fission bomb rather than a multi-stage, megaton-range fusion weapon. It utilized a scheme in which fission and fusion fuel were "layered", a design known as the Sloika ((Ru: Слойка) named after a type of layer cake) model in the Soviet Union. A similar design was earlier theorized, but never tested, in the USA as the "Alarm Clock".

Its power was roughly equivalent to 400 kilotons of TNT. The Soviet physicist Yuli Khariton estimated that Joe 4's yield was 15% to 20% fusion, the rest fission boosted by the fast neutrons released in the fusion. Being a single-stage weapon, though, it was not capable of being scaled up indefinitely like "true" hydrogen bombs (see Teller-Ulam design for more details on the distinctions between fusion weapons).

Despite its inability to be scaled into the megaton range, the detonation was used by Soviet diplomats as leverage. The Soviets claimed that they too had a hydrogen bomb, but unlike the United States' first thermonuclear weapon, theirs was deployable (i.e. could be dropped from a bomber). Despite this claim, U.S. experts disputed its standing as a "true" hydrogen bomb. The United States did not develop a deployable version of its hydrogen bomb until 1954. The Sloika model was never widely deployed.

The first Soviet test of a "true" hydrogen bomb was on November 22, 1955, the RDS-37 warhead. All were at Semipalatinsk Test Site, Kazakhstan.

See also:

• Joe 1
• RDS-37
• Soviet atomic bomb project
• Ivy Mike
• Castle Bravo

External links

• [Soviet and Nuclear Weapons History]

References

• David Holloway, Stalin and the Bomb: The Soviet Union and Atomic Energy 1939-1956 (Yale University Press, 1995), ISBN 0300066643
• Alexei Kojevnikov, Stalin's Great Science: The Times and Adventures of Soviet Physicists (Imperial College Press, 2004), ISBN 1860944205
• Richard Rhodes, Dark Sun: The Making of the Hydrogen Bomb (Simon and Schuster, 1995), ISBN 068480400X

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