Magnetic lens arrangement for corpuscular radiation equipment working under a vacuum

摘要

A magnetic lens arrangement for corpuscular radiation equipment working under a vacuum, in particular an objective lens for high voltage electron microscopes, which permits having objects to be examined disposed in a vacuum chamber at room temperature, is achieved by an arrangement which includes a vacuum chamber having a lens coil winding, a superconductive shielding device which is of cup-shaped design and encloses the winding, two superconductive shielding cylinders disposed one behind the other with mutual spacing enclosed by the winding, with a vacuum chamber for the object to be examined disposed in front of the open side of the shielding device and the first shielding cylinder.