U.S. Philips Corporation

Andrew J Guest

Derek Washington

In a laminated channel plate electron multiplier, an apertured metal sheet (32) is disposed at a small distance (30 .mu.m) from the outer surface of the input dynode and is used to provide a small negative field for turning back stray secondary electrons which have sufficient energy to follow trajectories across the input side of the input dynode. More particularly, the areas between the apertures of the input dynode (22) are masked by a material (34) having a secondary electron emission coefficient of less than 2, which material (34) is provided on the outer surface of the apertured metal sheet (32), the metal sheet (32) being spaced from the input dynode (22) by an insulating material (36). A potential of the order of -10 V relative to the input dynode is applied to the apertured metal sheet (32).

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Crawley, United Kingdom

Andrew J Guest