The sphere must be almost completely covered by photomultipliers to capture the faint flashes of light.
As the name indicates, a photomultiplier ‘’multiplies’’ weak electrical signals generated by faint light signals making them measurable. It is composed of a vacuum tube containing different types of electrodes. A photon that hits the photomultiplier causes the release of an electrone, which is then accelerated by an electric field and triggers a cascading multiplication process that generates hundreds of millions of electrons. These produce then a measurable electric signal.
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