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accelerating potential amperes angular aperture applied field AV/V axial field axis bell shape field bismuth calculated chromatic aberration chromatic aberration coefficient computer program diamagnetic double pie coil dysprosium electron lens electron microscopes experimental Fe-Co pole piece ferromagnetic field distribution field excitation field shapes Figure flux lines flux trapping focal distance focal length Gaussian optics given GO TO 44 Grinnell College half-width high current high field Joule heating kgauss lens configurations low fields magnetic field intensity magnetic lenses marginal rays maximum field gradient Nb^Sn discs object focal point objective lens optical parameters paraxial ray trajectory peak field intensity pie coil configurations power supply PRINT properties ray tracing region resolution limit saturation magnetization sets of discs shielding discs shown in Fig single pie coil solenoid field spherical aberration coefficient stability superconducting discs superconducting lens superconducting solenoid temperature tion TIVD trapping discs YDATA