Accession Number : ADA605863


Title :   Explosive Emission and Gap Closure from a Relativistic Electron Beam Diode


Descriptive Note : Conference paper


Corporate Author : LOS ALAMOS NATIONAL LAB NM


Personal Author(s) : Coleman, J E ; Moir, D C ; Ekdahl, C A ; Johnson, J B ; McCuistian, B T ; Crewford, M T


Full Text : http://www.dtic.mil/dtic/tr/fulltext/u2/a605863.pdf


Report Date : Jun 2013


Pagination or Media Count : 7


Abstract : Explosive emission cathode studies are currently being conducted on a high power relativistic electron beam diode. A black velvet cathode is driven with a 75 Ohm graded transmission line, which provides a 3.8 MV, 80 ns (FWHM) pulse across a fixed A-K gap of 17.8 cm. Cathode sizes range from 1.9 7 cm with space-charge limited currents of 0.26 3 kA. The principal objective of these experiments is to quantify the current emission limits and the dynamics of the gap closure process. A qualitative comparison of experimental and calculated results are presented, which included the I-V relationship, impedance and perveance curves, plasma expansion velocity, and the time-resolved light emission on the surface of the cathode.


Descriptors :   *DIODES , *ELECTRON BEAMS , CATHODES , EXPLOSIVES , HIGH POWER , IMPEDANCE , SIZES(DIMENSIONS) , SPACE CHARGE , TRANSMISSION LINES , VELOCITY


Subject Categories : Electrical and Electronic Equipment
      Particle Accelerators


Distribution Statement : APPROVED FOR PUBLIC RELEASE