Method of producing rapid heating of a cathode installed in a thermionic emission assembly

A method of producing rapid heating of a cathode installed in a thermionic emission assembly that includes an anode and a cathode, the cathode contained within an interior region of a Wehnelt cap having a cap beam aperture and adapted to receive electrical energy that heats the cathode to a sufficiently high temperature to emit a beam of electrons propagating through the cap beam aperture, and the Wehnelt cap designed to increase in heat to quickly reach a stable temperature as the cathode emits the beam of electrons, comprising:

• positioning a cathode support structure within the interior region of the Wehnelt cap, the cathode support structure including multiple filament posts extending from different ones of multiple blocks holding the cathode, the blocks electrically connecting the filament posts and thermally isolating the filament posts from the cathode, and the interior region defined by a side wall that encompasses the cathode and extends between a mounting side and a top side of the Wehnelt cap, the top side including the cap beam aperture;
• positioning a ceramic base to form a combined electrical and thermal interface separating the Wehnelt cap and the anode;
• and
• operatively connecting the filament posts, mounting side of the Wehnelt cap, and anode to the ceramic base to form an integrated structure in which the interface thermally isolates the Wehnelt cap from the anode to allow, when electrical energy is applied, the cathode to reach the sufficiently high temperature to emit the beam of electrons and the Wehnelt cap to quickly reach the stable temperature.