Measuring current emission and work functions of large thermionic cathodes.
Abstract
As one component of the nations Stockpile Stewardship program, Los Alamos National Laboratory is constructing a 20 MeV, 2 kA (with a 4 kA upgrade capability), 3ps induction linac for doing x-ray radiography of explosive devices. The linac is one leg of a facility called the Dual-Axis Radiography Hydrodynamic Test Facility (DARHT). The electron gun is designed to operate at 3.2 MV. The gun is a Pierce type design and uses a 6.5' cathode for 2 kA operation and an 8' cathode for 4 kA operation. We have constructed a small facility called the Cathode Test Stand (CTS) to investigate engineering and physics issues regarding large thermionic dispenser-cathodes. In particular, we have looked at the issues of temperature uniformity on the cathode surface and cathode quality as measured by its work function. We have done thermal imaging of both 8' and 6.5' cathodes. Here we report on measurements of the cathode work function, both the average value and how it vanes across the face of the cathode.
- Authors:
-
- Clifford M.
- Publication Date:
- Research Org.:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 975915
- Report Number(s):
- LA-UR-01-6870
TRN: US1006817
- Resource Type:
- Conference
- Resource Relation:
- Conference: Submitted to: IEEE International Vacuum Electronics Conference, April 23-25, 2002, Monterey, CA
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 43 PARTICLE ACCELERATORS; CATHODES; DESIGN; ELECTRON GUNS; EXPLOSIVES; HYDRODYNAMICS; INDUCTION; LANL; LINEAR ACCELERATORS; PHYSICS; STOCKPILES; THERMIONICS; VANES; WORK FUNCTIONS; X-RAY RADIOGRAPHY
Citation Formats
Fortgang, C M. Measuring current emission and work functions of large thermionic cathodes.. United States: N. p., 2001.
Web. doi:10.1109/IVELEC.2002.999388.
Fortgang, C M. Measuring current emission and work functions of large thermionic cathodes.. United States. https://doi.org/10.1109/IVELEC.2002.999388
Fortgang, C M. 2001.
"Measuring current emission and work functions of large thermionic cathodes.". United States. https://doi.org/10.1109/IVELEC.2002.999388. https://www.osti.gov/servlets/purl/975915.
@article{osti_975915,
title = {Measuring current emission and work functions of large thermionic cathodes.},
author = {Fortgang, C M},
abstractNote = {As one component of the nations Stockpile Stewardship program, Los Alamos National Laboratory is constructing a 20 MeV, 2 kA (with a 4 kA upgrade capability), 3ps induction linac for doing x-ray radiography of explosive devices. The linac is one leg of a facility called the Dual-Axis Radiography Hydrodynamic Test Facility (DARHT). The electron gun is designed to operate at 3.2 MV. The gun is a Pierce type design and uses a 6.5' cathode for 2 kA operation and an 8' cathode for 4 kA operation. We have constructed a small facility called the Cathode Test Stand (CTS) to investigate engineering and physics issues regarding large thermionic dispenser-cathodes. In particular, we have looked at the issues of temperature uniformity on the cathode surface and cathode quality as measured by its work function. We have done thermal imaging of both 8' and 6.5' cathodes. Here we report on measurements of the cathode work function, both the average value and how it vanes across the face of the cathode.},
doi = {10.1109/IVELEC.2002.999388},
url = {https://www.osti.gov/biblio/975915},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Mon Jan 01 00:00:00 EST 2001},
month = {Mon Jan 01 00:00:00 EST 2001}
}