Investigation of electrical breakdown in vacuum
The program objectives are focused on increasing the voltage applied across an electron beam diode. Two objectives were pursued during the program. The first was to increase the total voltage applied to anelectron gun anode--cathode (A-K) structure by suppressing electron emission from regions other than the electron source. The second objective was to prevent surface flashover from the cathode surface due to fiber contamination from the carbon felt used to enhance electron emission from the source. The primary approach consisted of using a dielectric coating (or a surface treatment), to suppress undesired electron emission from non-emission areas of the cathode. In addition to the dielectric coating, the electrode surfaces were profiled to eliminate field enhancements in the transition areas. The program objectives were met by demonstrating 300 kv/cm fields across the gap during current conduction with no breakdown or surface flashover. This field value was obtained with electrodes coated with a dielectric polymer on the surfaces around the electron source (carbon felt) and with electrodes without the coating. Total pulse width duration was 300 nsec for electrodes with no emitter (carbon felt) and 100 nsec for electrodes with the emitter.
- Research Organization:
- Los Alamos National Lab., NM (United States); Tetra Corp., Albuquerque, NM (United States)
- Sponsoring Organization:
- USDOE; USDOE, Washington, DC (United States)
- DOE Contract Number:
- W-7405-ENG-36
- OSTI ID:
- 6608805
- Report Number(s):
- LA-SUB-93-132; TR-91-002; ON: DE93010757
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
GENERAL PHYSICS
36 MATERIALS SCIENCE
ALUMINIUM
COATINGS
IMIDES
DIELECTRIC PROPERTIES
STAINLESS STEELS
SULFONES
BREAKDOWN
DIELECTRIC MATERIALS
ELECTRODES
ELECTRON EMISSION
FLASHOVER
IONIC CONDUCTIVITY
POLYMERS
PROGRESS REPORT
ALLOYS
CURRENTS
DOCUMENT TYPES
ELECTRIC CONDUCTIVITY
ELECTRIC CURRENTS
ELECTRIC DISCHARGES
ELECTRICAL PROPERTIES
ELEMENTS
EMISSION
HIGH ALLOY STEELS
IRON ALLOYS
IRON BASE ALLOYS
MATERIALS
METALS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
ORGANIC SULFUR COMPOUNDS
PHYSICAL PROPERTIES
STEELS
661300* - Other Aspects of Physical Science- (1992-)
360104 - Metals & Alloys- Physical Properties
360606 - Other Materials- Physical Properties- (1992-)