We describe the optical diagnostics used to measure magnetic fields up to 11 MGauss (1100 T) produced by Russian MC1 magnetic flux compression generators propelled by American high explosives in a joint experiment. The fields were measured by Faraday rotation in glass samples placed between thin polarizers. Light was introduced and collected in multi-mode fiber optics, allowing the laser light source and the recording instrumentation to be housed in a bunker about 20 m from the explosion. Great care was taken to keep the volume of the diagnostics small so that they would survive the generator implosions long enough to complete the measurements.
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