PHOTOMULTIPLIER TUBE HAS AN INSENSITIVE DYNODE AT HIGH MAGNETIC FIELDS

摘要

P PHOTOMULTIPLIER TUBE INSENSITIVE HIGH MAGNETIC FIELDS, COMPRISING A PHOTOCATHODE 11 DEPOSITED ON A TRANSPARENT WINDOW 12 AT THE END OF AN INSULATING SLEEVE 14, THIS PHOTOCATHODE 11 BEARING TO A POTENTIAL REFERENCE VO. THIS PHOTOMULTIPLIER TUBE IS REMARKABLE IN THAT IT HAS A SINGLE AMPLIFIER STAGE CONSISTING OF A DYNODE 15 IN THE FORM OF A METAL SURFACE MOVING ON A CONTOUR 16 SURROUNDING THE PHOTOCATHODE 11 AND COVERING ON ITS INTERNAL SIDE 17 A LAYER OF SECONDARY EMISSION MATERIAL, WHILE AN ANODE 18 FORMED BY A HOMEOMORPHAL METAL GRID ON THE SURFACE OF THE DYNODE 15 IS PLACED PARALLELALLY AND AT LOW DISTANCE THEREOF, AND IN THAT THE DYNODE 15 AND THE ANODE 18 ARE CARRIED OUT RESPECTIVELY TO AN ELECTRICAL POTENTIAL V1 GREATER THAN THE REFERENCE VO POTENTIAL AND TO AN ELECTRICAL POTENTIAL V2 EXCEEDING THE V1 POTENTIAL OF THE DYNODE. / P P APPLICATION TO NUCLEAR PHYSICS. / P