Abstract
To obtain an axial field distribution desirable for an electron microscope objective, i.e. with high peak intensity and small halfwidth, use has been made of the flux shielding property of hollow superconducting cylinders. Two cylinders, separated by a gap, are coaxially arranged in the bore of a superconducting solenoid. An apparatus is described in which the axial field distribution in the lens can be measured using the Faraday effect in cerium phosphate glass at 4.2K. In this glass the Faraday rotation is large at low temperatures and proportional to the magnetic field. The measured field distribution is compared with that obtained from a resistor network and from a computer. The agreement was satisfactory. With the computer program the most important electron optical quantities have been calculated. Lens defects due to ellipticity and misalignment of the cylinders are discussed. The results are promising especially for high voltage electron microscopy.
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