Polymer film‐type channel electron multipliers: Their characteristics and comparison with bulk‐type flexible multipliers

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Abstract
Polymer film‐type channel electron multipliers (CEMs) were developed and their characteristics investigated in comparison with bulk‐type flexible CEM. As film‐type CEMs, a paint‐coating‐type CEM and a solvent‐etching‐type CEM were fabricated. The paint‐coating‐type CEM is made by coating a “paint” which is prepared by dissolving in a solvent an electronically conductive polymeric composition having a high secondary electron emission yield. Up to the present study the mean gain of the film‐type CEM, in spite of the lower resistivity of the dynode, seems to be slightly more dependent on the count rate than that of the bulk‐type CEM made of the same material. However, the convenience of fabricating the dynode film by coating the dynode‐forming paint on the internal surface of any shaped tube or a flexible polymer tube would overcome the slight disadvantage mentioned above.

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