Patent ID: 7786671

Claim:
A single-channel photomultiplier tube, comprising: a sealed envelope, including a wall forming a photon-transparent window having an external face and an internal face that has an internal concavity with a central axis, turned toward the inside of the tube, and having a plane of symmetry containing the central axis; a photocathode arranged on the internal face of the wall forming the transparent window configured to receive light photons having passed through the transparent window; focusing optics including one or more electrodes; an electron multiplier with a focused linear structure located downstream of the optics in a direction of travel of the electrons, including a plurality of dynodes including a first dynode, intermediate dynodes, a penultimate dynode, and a final dynode; an anode; and connection means passing through the sealed envelope and including contacts for external connection to the envelope, themselves connected to internal electrical connections, for respectively connecting the photocathode, the dynodes, electrodes forming together the focusing optics, and the anode, at their respective operating voltages, wherein the electron multiplier includes parts physically distinct from one another, with each part forming an autonomous multiplier, and the autonomous multipliers having between them a symmetry of revolution with respect to the central axis of the concavity.