Swan (nuclear primary)

Swan was a United States test nuclear explosive, which was developed into the XW-45 warhead. The Swan device is the first design to incorporate a two-point ignition hollow-pit air-lens implosion assembly together with fusion boosting.
It was tested standalone on June 22, 1956, in shot Redwing Inca. It was tested again as the primary of a thermonuclear device on July 2, 1956, in shot Redwing Mohawk. Both tests were successful.

Design features

The Swan device had a yield of 15 kilotons, weighed, and had a ovoidshape with a diameter of and a length of, a length to diameter ratio of 1.97.
The above schematicillustrates what were probably its essential features.