http://en.wikipedia.org/wiki/Castle_Yankee
Quote:
Jughead
Yankee was originally intended to be a test of a simplified and lightened bomb version (the TX-16, or "emergency capability" EC-16) of the large and complex cryogenic device (the first successful multi-stage fusion device) tested in Ivy Mike. A small number of EC-16s were produced on an emergency basis to provide a stop-gap thermonuclear weapon capability in response to the Russian nuclear weapons program.
The test device, code-named "Jughead", had been prepared as a backup in case the non-cryogenic "Shrimp" fusion device (first tested in Castle Bravo) failed to work. The test of "Jughead" was cancelled when the Bravo device was successful, and the few EC-16s which were actually built were withdrawn and dismantled.
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There's a picture there....it doesn't look anything like the bomb in the show. Just thought it was interesting, since you know the writers research this stuff beforehand.