Electron multiplier and photomultiplier including the same

摘要

The present invention relates to an electron multiplier and others to effectively suppress luminescence noise, even in compact size, in which each of multistage dynodes has a plurality of columns each having a peripheral surface separated physically, and in which each column is processed in such a shape that an area or a peripheral length of a section parallel to an installation surface on which the electron multiplier is arranged becomes minimum at a certain position on the peripheral surface in the column of interest.

主权项

1. An electron multiplier supported by an installation surface that is defined by a first direction and a second direction perpendicular to the first direction, comprising multistage dynodes arranged in series on the installation surface, along the first direction on the installation surface, and configured to implement cascade multiplication of electrons traveling along a direction parallel to the first direction, the multistage dynodes constituted by:
a first dynode directly fixed on the installation surface, the first dynode having a column that extends a third direction perpendicular to both the first and second directions; and a second dynode directly fixed on the installation surface in a state that the second dynode is spaced from the first dynode along the first direction, the second dynode having a column that extends along the third direction and is spaced from the column in the first dynode; wherein, in each of the first and second dynodes, the column has a cross-section in a horizontal plane parallel to the installation surface that varies in at least one of size or shape depending upon the height of the column in the third direction.