Accession Number : ADA223702


Title :   High-Current-Density Thermionic Cathodes and the Generation of High-Voltage Electron Beams


Descriptive Note : Final technical rept. 1 Sep 1982-30 Apr 1989


Corporate Author : MICHIGAN UNIV ANN ARBOR DEPT OF ELECTRICAL ENGINEERING AND COMPUTER SCIENCE


Personal Author(s) : Herniter, Marc E ; Lipscomb, George ; Pearce, Kelly D


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a223702.pdf


Report Date : 30 Apr 1989


Pagination or Media Count : 152


Abstract : The project entitled 'High-Current-Density Thermionic Cathodes ' and 'High Voltage Electron Beams From Thermionic Cathodes' is aimed at developing a thermionic cathode of high current density for use intense electron-beam generators. The emitting material under study is lanthanum hexaboride (LaB6). The project breaks down into 3 major parts: development of methods for heating LaB6 disks to the emission-temperature range of 1800 deg C; measurement of the emission-current distribution over the cathode surface and correlation with thermionic-emission theory; and design and testing of an electron-gun diode with an LaB6 cathode which would be a prototype for use in an intense beam generator. Keywords: LaB6, Lanthanum hexaboride, High-current density thermionic cathodes, High-voltage electron beams.


Descriptors :   *ELECTRON BEAMS , *THERMIONIC EMISSION , *CATHODES , *ELECTRON GUNS , INTENSITY , CURRENT DENSITY , SURFACES , HIGH DENSITY , GENERATORS , HIGH VOLTAGE , BORIDES , MATERIALS , EMISSION , LANTHANUM COMPOUNDS , DIODES , HIGH POWER


Subject Categories : Electrical and Electronic Equipment
      Particle Accelerators


Distribution Statement : APPROVED FOR PUBLIC RELEASE