US 3,976,905 AGranted

Channel electron multipliers

AssigneeRamot University for Applied Research and Industrial Development Ltd.

InventorsAdy Seidman, Zohar Avrahami, Benjamin Sheinfux, Jan Grinberg

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Abstract

A channel electron multiplier is described having a tubular wall coated w a secondary-electron emitting material and including an electric field for accelerating the electrons, the electric field comprising a plurality of low-resistive conductive rings each alternating with a high-resistive insulating ring. The thickness of the low-resistive rings is many times larger than that of the high-resistive rings, being in the order of tens of microns for the low-resistive rings and at least one order of magnitude lower for the high-resistive rings; and the diameter of the channel tubular walls is also many times larger than the thickness of the high-resistive rings. Both single-channel and multiple-channel electron multipliers are described. A very important advantage, particularly in making multiple-channel multipliers, is the simplicity of the procedure that may be used in constructing such multipliers. Other operational advantages are described.

Claims11

Dependent claims

A channel electron multiplier including a plurality of layers of low-resistive material each alternating with a layer of high-resistive material;

a tubular wall defined by an opening extending through the plurality of layers so as to form a plurality of axially-extending rings constituted by the edges of the opening through the layers, and a secondaryemission coating thereover;
the low-resistive layers being each of a thickness many times large than that of the high-resistive layers, the diameter of the tubular wall being many times larger than the thickness of the high-resistive layers;
said secondary-emission coating being in contact with the edges of the low-resistive and high-resistive layers defining said opening, and bring of a resistive material capable of emitting secondary electrons when struck by an incident electron or other charged particle or radiation;
and means for applying a stepped electric voltage gradient to said plurality of low-resistive rings to thereby produce an electric field within the tubular wall which electric field has a radial component for accelerating the electron or other charged particle and for causing it to strike the resistive coating and to produce electrons by secondary emission.

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Dependencies are inferred from the claim text.