stigmatic focus
stigmatic focus
"Stigmatic focus" means image formation without off-axial astigmatism. For example, in the original Wien filter, focusing action occurs only in the electric field direction but does not occur in the magnetic field direction. Thus, even when an incident beam to the filter is circular, a liner beam is obtained on the image plane. To accomplish astigmatism-free imaging in the Wien filter, application of curved electric and magnetic fields produces magnetic components in the original electric field direction and thus attains the focusing action in the original magnetic field direction.
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