= Trigger
{disambiguate=particle physics}
{wiki}
= Detector trigger
{synonym}
A <detector trigger> decides which candidate events cause a readout or recording. It can concentrate a limited recording capacity on rare interactions, but the accepted events then form a selected sample. A <coincidence circuit> uses a timing relation between several detectors; the <Blackett-Occhialini triggered cloud-chamber experiment> made that relation operate an entire camera-and-expansion sequence.
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