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The Koon shot of Operation Castle was a test of a thermonuclear device designed at the University of California Radiation Laboratory (UCRL), now Lawrence Livermore National Laboratory. The "dry" two-stage device was known as "Morgenstern" and had a highly innovative secondary stage. It was tested on April 7, 1954.
The test was part of the Koon shot of Operation Castle. The Mk-22 failed to achieve anything like its intended yield due to premature heating of the secondary from exposure to neutrons. As the other UCRL test planned for the Castle series, the liquid-fueled "Ramrod" device had the same basic design flaw, that test was canceled
Such fizzles can have very high yields, as in the case of Castle Koon, where the secondary stage of a device with a 1 megaton design fizzled, but its primary still generated a yield of 100 kilotons, and even the fizzled secondary still contributed another 10 kilotons, for a total yield of 110 kT.
Mark 21 – Re-designed variant of Castle Bravo test; Mark 22 – Failed thermonuclear design (Castle Koon device, cancelled April 1954). Mark 24 – High-yield thermonuclear, very similar to Mk-17 but had a different secondary. Mark 26 – Similar design to Mk 21 (cancelled 1956). Mark 27 – Navy nuclear bomb (1958–1965) Mk 101 Lulu (1958 ...
Operation Castle was a United States series of high-yield (high-energy) nuclear tests by Joint Task Force 7 (JTF-7) at Bikini Atoll beginning in March 1954. It followed Operation Upshot–Knothole and preceded Operation Teapot .
Mark 14 nuclear bomb. Castle Union was the code name given to one of the tests in the Operation Castle series of United States nuclear tests.It was the first test of the TX-14 thermonuclear weapon (initially the "emergency capability" EC-14), one of the first deployed U.S. thermonuclear bombs.
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