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Title: Hot filament performance in a Freeman ion source

Abstract

Here, we report on the simulation results of the hot tungsten filament behavior in a Freeman ions source installed in the LANL electro-magnetic isotope separator (EMIS). The Freeman source enables us to ionize and extract high intensity single-charge ion beams from different gases as well as from various solid materials in order to purify the content of a selected isotope. We have modified our LANSCE H– Ion Source Filament Model to calculate the ion source working parameters during a beam production cycle and estimate the ion source filament lifetime. Two main mass erosion processes of the hot cathode in a Freeman ion source are included: thermal evaporation and plasma sputtering. The initial working temperature of the ion source filament was estimated to be in range of 2400 to 2500 K. The filament model shows that the plasma sputtering rate is several magnitude of order higher than the thermal evaporation rate. The results of ion source modeling were compared with recorded data during the EMIS beam production runs using krypton noble gas.

Authors:
ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1];  [1];  [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 National Nuclear Security Administration (NNSA), Office of Defense Nuclear Nonproliferation (NA-20)
OSTI Identifier:
1565852
Report Number(s):
LA-UR-17-29242
Journal ID: 0094-243X
Grant/Contract Number:  
89233218CNA000001
Resource Type:
Accepted Manuscript
Journal Name:
AIP Conference Proceedings
Additional Journal Information:
Journal Volume: 2011; Conference: 17. International Conference on Ion Sources, Geneva (Switzerland), 15-20 Sep 2017
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; Accelerator Design; Technology; and Operations; ion source; filament modeling; plasma sputtering; thermal evpoartion

Citation Formats

Draganic, Ilija N., Leibman, Christopher P., Rybarcyk, Lawrence J., Bronson, Tyler M., and Dudeck, Kevin W. Hot filament performance in a Freeman ion source. United States: N. p., 2018. Web. doi:10.1063/1.5053266.
Draganic, Ilija N., Leibman, Christopher P., Rybarcyk, Lawrence J., Bronson, Tyler M., & Dudeck, Kevin W. Hot filament performance in a Freeman ion source. United States. doi:10.1063/1.5053266.
Draganic, Ilija N., Leibman, Christopher P., Rybarcyk, Lawrence J., Bronson, Tyler M., and Dudeck, Kevin W. Fri . "Hot filament performance in a Freeman ion source". United States. doi:10.1063/1.5053266. https://www.osti.gov/servlets/purl/1565852.
@article{osti_1565852,
title = {Hot filament performance in a Freeman ion source},
author = {Draganic, Ilija N. and Leibman, Christopher P. and Rybarcyk, Lawrence J. and Bronson, Tyler M. and Dudeck, Kevin W.},
abstractNote = {Here, we report on the simulation results of the hot tungsten filament behavior in a Freeman ions source installed in the LANL electro-magnetic isotope separator (EMIS). The Freeman source enables us to ionize and extract high intensity single-charge ion beams from different gases as well as from various solid materials in order to purify the content of a selected isotope. We have modified our LANSCE H– Ion Source Filament Model to calculate the ion source working parameters during a beam production cycle and estimate the ion source filament lifetime. Two main mass erosion processes of the hot cathode in a Freeman ion source are included: thermal evaporation and plasma sputtering. The initial working temperature of the ion source filament was estimated to be in range of 2400 to 2500 K. The filament model shows that the plasma sputtering rate is several magnitude of order higher than the thermal evaporation rate. The results of ion source modeling were compared with recorded data during the EMIS beam production runs using krypton noble gas.},
doi = {10.1063/1.5053266},
journal = {AIP Conference Proceedings},
number = ,
volume = 2011,
place = {United States},
year = {2018},
month = {9}
}

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