PHOTOMULTIPLIER WITH LARGE AREA OF PHOTOCATHODE Russian patent published in 2016 - IPC H01J43/00 H01J1/34 

FIELD: physics; optics.

SUBSTANCE: photomultiplier can be used for detecting weak light signals in research in high-energy and nuclear physics, in other various technical applications, including for observing extremely weak light signals. Design of photomultiplier consists of cylindrical glass housing, on inner surface of which there is a photocathode. Actual diameter of housing can exceed 100 mm. Along photocathode is sputtered a distributed voltage divider in form of strip resistor. Dynode system is located at end of glass housing and consists of 12 louvered dynodes and one flat dynode. Before each dynode there is a screen welded to it by spot welding. Photomultiplier operates as follows. During illumination of photocathode, photoelectrons knocked therefrom are accelerated towards louvered dynode system, providing required gain. Secondary electrons, knocked from last flat dynode, are collected on a mesh dynode. Fig. 4 shows a prototype of counter of a portal detector with, integrated into volume of scintillator, one of active prototypes of disclosed photomultiplier.

EFFECT: high sensitivity of photomultiplier.

3 cl, 4 dwg