A stigmator is a component of electron microscopes that reduces astigmatism of the beam by imposing a weak electric or magnetic quadrupole field on the electron beam. == Background == For early electron microscopes - between the 1940s and 1960s - astigmatism was one of the main performance limiting factors.
A stigmator is a component of electron microscopes that reduces astigmatism of the beam by imposing a weak electric or magnetic quadrupole field on the electron beam. == Background == For early electron microscopes - between the 1940s and 1960s - astigmatism was one of the main performance limiting factors.
Source: Wikipedia "Stigmator" · CC BY-SA 4.0
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