| 摘要 |
<p>A directly heated cathode for generating an electron beam along an axis (A) comprises two nested, dish-shaped conductors (4,5) on the axis joined electrically and mechanically on the axis by a spot weld (7), and supported by respective co-axial cylinders (1,2). A heater current supplied by the cylinders (1,2) flows between the conductor rims by way of the spot weld (7), and does not interfere with the electron beam generated by the outer conductor (5).</p> |
