TY - JOUR AU - MARUSE,, Susumu AB - Abstract A forumula for the field strength at the cathode tip of the point cathode electron gun is analytically derived by taking account of the effect of the shank of the pointed filament. For this purpose, the point cathode is approximated by a slender ellipsoid tip, and the thickness of the eathode tip calcuted with this approximation method shows a fairly good agreement with the result obtained by means of the digital computer, and that the Schottky effect is not effectively utilized under the conventional operating conditions of the point cathode electron gun. This content is only available as a PDF. © Oxford University Press TI - Field Strength at the Cathode Tip of the Point Cathode Electron Gun JF - Journal of Electron Microscopy DO - 10.1093/oxfordjournals.jmicro.a049869 DA - 1973-01-01 UR - https://www.deepdyve.com/lp/oxford-university-press/field-strength-at-the-cathode-tip-of-the-point-cathode-electron-gun-4yocpq1kYj SP - 135 EP - 140 VL - 22 IS - 2 DP - DeepDyve ER -