Temporal response of a surface flashover on a velvet cathode in a relativistic diode

Coleman, J. E.; Moir, D. C.; Crawford, M. T.; Welch, D. R.; Offermann, D. T.

doi:10.1063/1.4914851

Title: Temporal response of a surface flashover on a velvet cathode in a relativistic diode

Journal Article · Wed Mar 11 00:00:00 EDT 2015 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.4914851· OSTI ID:1291215

Coleman, J. E. ^[1]; Moir, D. C. ^[1]; Crawford, M. T. ^[1]; Welch, D. R. ^[2];

^[2]

Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Voss Scientific, Albuquerque, NM (United States)

Surface flashover of a carbon fiber velvet cathode generates a discharge from which electrons are relativistically accelerated to γ ranging from 4.9 to 8.8 through a 17.8 cm diode. This discharge is assumed to be a hydrocarbon mixture. Our objective is to quantify the dynamics over the ~100 ns pulse of the plasma discharge generated on the surface of the velvet cathode and across the anode-cathode (A-K) gap. We present a qualitative comparison of calculated and measured results, which includes time resolved measurements with a photomultiplier tube and charge-coupled device images. Additionally, initial visible spectroscopy measurements will also be presented confirming the ion species are dominated by hydrogen.

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Research Organization:: Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC52-06NA25396

OSTI ID:: 1291215

Alternate ID(s):: OSTI ID: 1228167

Report Number(s):: LA-UR-15-20392; PHPAEN

Journal Information:: Physics of Plasmas, Vol. 22, Issue 3; ISSN 1070-664X

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 5 works

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