Photomultiplier tube has a dynode insensitive to the fields students

摘要

Photomultiplier tube which is insensitive to the fields magnetic students, comprising a photocathode 11 filed ed ris tho 12 on a transparent at the end of an insulating sleeve 14, said photocathode 11 being reach a reference potential vo. The photomultiplier tube is remarkable in that it comprises a single amplifier stage constituted by a dynode 15 object in the form of a metallic surface bearing on a contour 16 substantially surrounding the photocathode 11 and carries on its internal face 17 a layer of a material has a secondary emission, whereas an anode 18 formed by a metallic grid homeomorphic at the surface of the first dynode 15 is mounted parallel and has a small distance from that - latter, and in that the dynode 15 and the anode 18 are respectively litters has an electrical potential v1 superior to the reference potential vo and has an electrical potential v2 superior to the potential v1 of the dynode. / p & & p & application to the resonance.