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PI Physik Instrumente - Microscope Stages LB ROS 11/24
Photonics Dictionary

magnetically focused image tube

A vacuum tube in which a magnetic field is superimposed onto the tube's electrical field. When the two fields are aligned, electrons from the photocathode are accelerated through the tube in a spiral and strike the phosphor target as if they had traveled point-to-point, providing highly accurate reproductions of images.
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