High current density results from a LaB/sub 6/ thermionic cathode electron gun
- 1 January 1990
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Transactions on Plasma Science
- Vol. 18 (6) , 992-1001
- https://doi.org/10.1109/27.61515
Abstract
A Pierce-type electron gun using a planar 1.9-cm-diameter lanthanum hexaboride cathode is being studied as a robust thermionic emitter at high cathode-current densities. The gun has been operated up to voltages of 115 kV, achieving beam current densities of 30 A/cm/sup 2/. The electron gun operated dependably up to 90 kV, achieving temperature-limited currents of 50 A. Due to the high fields at the tip of the Pierce-focusing electrode, the gun would usually arc at voltages >90 kV. Ten shots were obtained at a gun voltage of 115 kV, achieving transmitted currents up to 89 A, transmitted beam power up to 10.2 MW, and transmitted power densities up to 3.4 MW/cm/sup 2/.Keywords
This publication has 22 references indexed in Scilit:
- High-current density, high-brightness electron beams from large-area lanthanum hexaboride cathodesJournal of Applied Physics, 1988
- Nonlinear photoemission from organic cathodes excited by a pulsed near-ultraviolet laserIEEE Journal of Quantum Electronics, 1987
- Os-coated cathode for very high emission-density applicationsIEEE Transactions on Electron Devices, 1987
- Electron Emission of over 200 A/CM2 from a Pulsed-Laser Irradiaied PhotocaihodeIEEE Transactions on Nuclear Science, 1985
- Free-electron laser beam qualityIEEE Journal of Quantum Electronics, 1985
- Bright Electron Beams For Free Electron LasersPublished by SPIE-Intl Soc Optical Eng ,1984
- Pierce-Type Electron Gun with a Large Concave LaB6 CathodeJapanese Journal of Applied Physics, 1981
- Some experimental and estimated characteristics of the lanthanum hexaboride rod cathode electron gunJournal of Physics E: Scientific Instruments, 1969
- Electron Gun using Long-Life Lanthanum Hexaboride CathodeJournal of Applied Physics, 1967
- Handbook of Thermionic PropertiesPublished by Springer Nature ,1966