Superconducting Objective Lenses for High Resolution Electron Microscopes |
Common terms and phrases
87 amperes amperes angular aperture applied field axial field axis bell shape field bismuth calculated CALL CHAR CALL LINE CALL LINEPLOT CALL PINPOINT chromatic aberration chromatic aberration coefficient computer program Cornell dH/dz diamagnetic double pie coil dysprosium experimental ferromagnetic field distribution field shapes Figure flux lines flux trapping focal distance focal length FORMAT free space Gaussian Gaussian optics given GO TO 11 half-width high current high field Hobj Joule heating lens configurations low fields magnetic lenses marginal rays maximum field gradient maximum field intensity Nb3Sn discs NMAX object focal point objective lens optical parameters paraxial ray trajectory peak field intensity pie coil configurations PLOT power supply PRINT properties ray tracing region resolution limit saturation magnetization SCALL sets of discs shielding discs shown in Fig solenoid field spherical aberration coefficient stability superconducting discs superconducting lens superconducting solenoid tape temperature tion trapping discs trapping fields Type II superconductors