Title :
PPPS-2013: Explosive emission and gap closure from a relativistic electron beam diode
Author :
Coleman, J.E. ; Moir, D.C. ; McCuistian, B.T. ; Ekdahl, C.A. ; Johnson, J.B. ; Crawford, M.T.
Author_Institution :
Los Alamos Nat. Lab., Los Alamos, NM, USA
Abstract :
Summary form only given. 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 M V, 60 ns (FWHM) pulse across a fixed A-K gap of 17.5 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 include time resolved current density distributions, impedance and perveance curves and plasma expansion velocity.
Keywords :
cathodes; current density; diodes; relativistic electron beams; space-charge limited devices; black velvet cathode; current 0.26 kA to 3 kA; emission limits; explosive emission cathode studies; gap closure process; graded transmission line; high power relativistic electron beam diode; impedance curve; perveance curve; plasma expansion velocity; resistance 75 ohm; size 1.9 cm to 7 cm; space-charge limited currents; time 60 ns; time resolved current density distributions; voltage 3.8 MV; Cathodes; Current density; Electron beams; Energy resolution; Explosives; Laboratories; Power transmission lines;
Conference_Titel :
Plasma Science (ICOPS), 2013 Abstracts IEEE International Conference on
Conference_Location :
San Francisco, CA
DOI :
10.1109/PLASMA.2013.6633330
