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Title: Modeling of tungsten filament in gas discharge in H- ion source

Abstract

Sources of negative ions such as H- are essential elements of proton accelerators and tokamaks. They have limited lifetime. The replacement of an ion source is a costly process causing delays in the operation of the entire machine. The hot tungsten filament is the key element that limits the lifetime of the H- ion source at the Los Alamos Neutron Science Center (LANSCE) facility. An accurate model, which describes the filament physics and provides a reliable estimate on its lifetime, may significantly improve the operation of the facility. In this report we describe such a model, including a comprehensive list of relevant physical processes from first principles. The model can be used to describe different regimes of operation using diagnostics data as input parameters. It has been benchmarked against the data collected during the production cycle at LANSCE and shows good agreement with experimental data.

Authors:
ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]
  1. Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1974927
Alternate Identifier(s):
OSTI ID: 1830860
Report Number(s):
LA-UR-21-24406
Journal ID: ISSN 0034-6748
Grant/Contract Number:  
89233218CNA000001
Resource Type:
Accepted Manuscript
Journal Name:
Review of Scientific Instruments
Additional Journal Information:
Journal Volume: 92; Journal Issue: 11; Journal ID: ISSN 0034-6748
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
thermionic emission; circuit theorems; thermal conductivity; thermodynamic states and processes; electric power; numerical methods; gas discharges; plasma properties and parameters

Citation Formats

Yampolsky, Nikolai, Rybarcyk, Lawrence, Henestroza, Enrique, and Draganic, Ilija. Modeling of tungsten filament in gas discharge in H- ion source. United States: N. p., 2021. Web. doi:10.1063/5.0056123.
Yampolsky, Nikolai, Rybarcyk, Lawrence, Henestroza, Enrique, & Draganic, Ilija. Modeling of tungsten filament in gas discharge in H- ion source. United States. https://doi.org/10.1063/5.0056123
Yampolsky, Nikolai, Rybarcyk, Lawrence, Henestroza, Enrique, and Draganic, Ilija. Wed . "Modeling of tungsten filament in gas discharge in H- ion source". United States. https://doi.org/10.1063/5.0056123. https://www.osti.gov/servlets/purl/1974927.
@article{osti_1974927,
title = {Modeling of tungsten filament in gas discharge in H- ion source},
author = {Yampolsky, Nikolai and Rybarcyk, Lawrence and Henestroza, Enrique and Draganic, Ilija},
abstractNote = {Sources of negative ions such as H- are essential elements of proton accelerators and tokamaks. They have limited lifetime. The replacement of an ion source is a costly process causing delays in the operation of the entire machine. The hot tungsten filament is the key element that limits the lifetime of the H- ion source at the Los Alamos Neutron Science Center (LANSCE) facility. An accurate model, which describes the filament physics and provides a reliable estimate on its lifetime, may significantly improve the operation of the facility. In this report we describe such a model, including a comprehensive list of relevant physical processes from first principles. The model can be used to describe different regimes of operation using diagnostics data as input parameters. It has been benchmarked against the data collected during the production cycle at LANSCE and shows good agreement with experimental data.},
doi = {10.1063/5.0056123},
journal = {Review of Scientific Instruments},
number = 11,
volume = 92,
place = {United States},
year = {2021},
month = {11}
}

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