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Title: Trak Investigation of Focusing Electrode Geometries for the DARHT Axis-I Diode

Abstract

An investigation was carried out on the effects of different cathode shroud geometries of the DARHT Axis-1 diode using the Trak ray tracing software. Pierce angles of 20, 30, 45, 60, and 67.5 degrees were investigated. For each geometry the current density with respect to radial position will be presented as it evolves in the longitudinal direction. In addition the emittances for each geometry are compared and this information is used to determine the optimal geometry from the selected angles. These results are compared to the baseline geometry currently employed at DARHT of a simple 2.5mm recessed velvet cathode. Of the selected angles it was found that 45 degrees produced the lowest normalized emittance value, whereas 60 degrees produced the most uniform current density profile at 1cm away from the emission surface. For the purpose of this investigation the effects of the bucking coil and solenoid around the hollow anode of the DARHT Axis I injector are neglected.

Authors:
 [1]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1357108
Report Number(s):
LA-UR-17-23948
DOE Contract Number:
AC52-06NA25396
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
47 OTHER INSTRUMENTATION; Explosive emission, pierce angle, velvet cathode

Citation Formats

Kallas, Nicholas Dimitrious. Trak Investigation of Focusing Electrode Geometries for the DARHT Axis-I Diode. United States: N. p., 2017. Web. doi:10.2172/1357108.
Kallas, Nicholas Dimitrious. Trak Investigation of Focusing Electrode Geometries for the DARHT Axis-I Diode. United States. doi:10.2172/1357108.
Kallas, Nicholas Dimitrious. Mon . "Trak Investigation of Focusing Electrode Geometries for the DARHT Axis-I Diode". United States. doi:10.2172/1357108. https://www.osti.gov/servlets/purl/1357108.
@article{osti_1357108,
title = {Trak Investigation of Focusing Electrode Geometries for the DARHT Axis-I Diode},
author = {Kallas, Nicholas Dimitrious},
abstractNote = {An investigation was carried out on the effects of different cathode shroud geometries of the DARHT Axis-1 diode using the Trak ray tracing software. Pierce angles of 20, 30, 45, 60, and 67.5 degrees were investigated. For each geometry the current density with respect to radial position will be presented as it evolves in the longitudinal direction. In addition the emittances for each geometry are compared and this information is used to determine the optimal geometry from the selected angles. These results are compared to the baseline geometry currently employed at DARHT of a simple 2.5mm recessed velvet cathode. Of the selected angles it was found that 45 degrees produced the lowest normalized emittance value, whereas 60 degrees produced the most uniform current density profile at 1cm away from the emission surface. For the purpose of this investigation the effects of the bucking coil and solenoid around the hollow anode of the DARHT Axis I injector are neglected.},
doi = {10.2172/1357108},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Mon May 15 00:00:00 EDT 2017},
month = {Mon May 15 00:00:00 EDT 2017}
}

Technical Report:

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