One primary device ( RACER ) was tested Testing in thermonuclear system mockup assemblies of TX-14 , TX-16 , and TX-17/TX-24 , to examine Testing and evaluate the behaviour of radiation cases and the compression of the secondary geometries by the primary 's x-rays prior to full-scale testing Testing during Castle .

Following RACER 's dodgy performance , the COBRA primary was used Using in the emergency capability ALARM CLOCK , JUGHEAD , RUNT I , RUNT II thermonuclear devices , as well as in the SHRIMP device .

RACER IV ( as redesigned and proof-tested in the Simon test Testing ) was employed Employment as primary for the ZOMBIE , RAMROD and MORGENSTERN devices Using .