Title :
Novel uniform heating topology for thermionic cathodes
Author :
Williams, Kenneth E. ; Gunther, Kim ; Curtis, Marc
Author_Institution :
Appl. Sci. & Eng. LLC, Hartford, WI, USA
Abstract :
Various methods of bringing thermionic cathodes to full emission temperature are described and compared for both temperature-limited emission and space charge-limited emission. Thermal Radiation Heating (TRH) and Backside Electron-beam Auxiliary Cathode Heating (BEACH) are described along with a novel Directly-Heated Cathode (DHC) design which significantly reduces variations in cathode surface temperature. A comparison of the calculated and measured temperature profiles for this new cathode heating topology using selected prototypes is presented.
Keywords :
heat radiation; thermionic cathodes; thermionic electron emission; backside electron-beam auxiliary cathode heating; cathode surface temperature; directly-heated cathode design; space charge-limited emission; temperature-limited emission; thermal radiation heating; thermionic cathodes; uniform heating topology; Cathodes; Current density; Electron beams; Space charge; Space heating; Temperature measurement; Thermal conductivity; Thermionic emission; Topology; Tungsten; CeB6; IrCe; LaB6; backside heating; barium; bombarders; bombardment heating; electron beam; electron gun; emission-limited; high work function; high-efficiency; low work function; sintered; space charge-limited; temperature-limited; thermionic cathodes; tungsten; uniform temperature profile;
Conference_Titel :
Vacuum Electronics Conference, 2009. IVEC '09. IEEE International
Conference_Location :
Rome
Print_ISBN :
978-1-4244-3500-5
Electronic_ISBN :
978-1-4244-3501-2
DOI :
10.1109/IVELEC.2009.5193586
