Portal:Physics/Selected picture/Week 5, 2007
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![](http://upload.wikimedia.org/wikipedia/commons/thumb/c/c1/Teller-Ulam_device_3D.svg/200px-Teller-Ulam_device_3D.svg.png)
Image credit: User:Fastfission
The Teller–Ulam design is a nuclear weapon design which is used in megaton-range thermonuclear weapons, and is more colloquially referred to as "the secret of the hydrogen bomb". This diagram depicts the basics of the Teller–Ulam configuration: a fission bomb uses radiation (from the bottom section) to compress and heat a separate section of fusion fuel (the top section).