Characterization of plasma formation and mass ejection in exploding foil initiators

Borman, Alexander J. and Dowding, Colin (2021) Characterization of plasma formation and mass ejection in exploding foil initiators. IEEE Transactions on Plasma Science, 49 (3). pp. 1159-1165. ISSN 0093-3813

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To aid exploding foil initiator (EFI) design, better prediction of ejecta momentum through either mass or velocity prediction is required. A numerical model was developed to calculate the mass of material converted to plasma within the confined region of an EFI bridge during the change of state under an electrical stimulus from a discharging capacitor. Optimization is facilitated through the increased understanding of plasma evolution in current EFI designs, including the impact of this on both current delivery to the bridge and overall unit efficiency. The plasma regions were formed in key regions within the bridge, termed P A (ground side of EFI) and P B (high-voltage side of EFI) in this work. Different regions were dominant in mass ejection for different operating voltages. A trend is identified wherein the bridge exhibits an optimum threshold between the capacitor energy being utilized for mass conversion to plasma and that used for acceleration of this mass. It is postulated that, through geometric design modification, this threshold can be adjusted to deliver the momentum threshold of the explosive for which an EFI may be designed.

Item Type: Article
Additional Information: Manuscript received February 13, 2020; revised July 28, 2020 and October 6, 2020; accepted October 6, 2020. Date of publication February 15, 2021; date of current version April 8, 2021. Funding Information: This work was supported by the University of Lincoln.
Uncontrolled Keywords: exploding foil initiator (efi),finite-element modeling,plasma mass ejecta,nuclear and high energy physics,condensed matter physics ,/dk/atira/pure/subjectarea/asjc/3100/3106
Faculty \ School: Faculty of Science > School of Engineering
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Depositing User: LivePure Connector
Date Deposited: 09 Feb 2022 12:30
Last Modified: 21 Apr 2023 01:22
DOI: 10.1109/TPS.2021.3056204

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