Teagan Nakamoto

Los Alamos National Laboratory

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Dalton Smith

Los Alamos National Laboratory

Christopher Trujillo

Los Alamos National Laboratory

John R. Gibson

Los Alamos National Laboratory

Douglas Tasker

Los Alamos National Laboratory

Elizabeth Francois

Los Alamos National Laboratory

Zakary Wilde

Los Alamos National Laboratory

Kristina Parrack

Los Alamos National Laboratory

Rylie Lodes

University of Illinois Urbana-Champaign

Zak Wilde

Los Alamos National Laboratory

Hayden Malcolm

Cooperative Institutions

Los Alamos National Laboratory

Tianjin Hi-Tech Superconducting Electronic Technology (China)

High Energy Accelerator Research Organization

European Organization for Nuclear Research

Waseda University

Osaka University

Kyoto University

Japan Proton Accelerator Research Complex

Faculty of 1000 (United Kingdom)

Istituto Nazionale di Fisica Nucleare

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HL-LHCアップグレードのためのビーム分離双極子の2mモデル磁石の開発状況【Powered by NICT】

IEEE Transactions on Applied Superconductivity (2016)

Masashi Sugano Sakae Enomoto Teagan Nakamoto H. Kawamata N. Okada

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Rogowski coils for studies of detonator initiation and other diagnostics

AIP conference proceedings (2018)

Douglas Tasker Patrick R. Bowden Elizabeth Francois John R. Gibson Teagan Nakamoto

Detonators are fundamental to most explosive systems, yet the detonators themselves are rarely diagnosed to determine how well they function or why they fail. To remedy this, various electrical diagnostics were explored, including: Rogowski coils for high fidelity detection of changes in electrical current in explosive bridgewires and how they relate to detonator performance; and radio frequency (RF) antennas to detect any electromagnetic emissions associated with reaction and growth in the explosives. A new type of Rogowski coil is described and some interesting phenomena were detected with the radio frequency antenna.

Detonator

Klystron

Clipper (electronics)

Thermonuclear Fusion

High fidelity

10.1063/1.5045027

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Probing detonator performance through radio wave emissions

AIP conference proceedings (2018)

Zakary Wilde John R. Gibson Teagan Nakamoto Dalton Smith Douglas Tasker

Experiments were performed using a copper antenna to observe transient electric fields generated by shocked Pentaerythritol Tetranitrate (PETN), which behaves as a piezoelectric explosive. PETN pellets were shocked using a detonator and polyvinyl chloride (PVC) as shock attenuation. The amount of attenuation was varied until an initiation threshold was found to increase the probability of a deflagration-to-detonation (DDT) transition occurring. These experiments showed distinct transient shifts in frequency over the duration of the experiments. Correlation was observed between certain shifts in frequency and if the PETN pellet detonated.

Pentaerythritol tetranitrate

Detonator

Deflagration

Transient (computer programming)

10.1063/1.5045030

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Fireset and Cable Design for Support of Detonator Diagnostic Development

Bulletin of the American Physical Society (2017)

Christopher Trujillo Elizabeth Francois John R. Gibson Rylie Lodes Teagan Nakamoto

Detonator

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Development of New Diagnostics for Detonator Characterization

OSTI OAI (U.S. Department of Energy Office of Scientific and Technical Information) (2017)

Teagan Nakamoto Elizabeth Francois John R. Gibson Dalton Smith Douglas Tasker

Detonator

Characterization

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High Performance Modeling of Novel Diagnostics Configuration

Bulletin of the American Physical Society (2017)

Dalton Smith John Gibson Rylie Lodes Hayden Malcolm Teagan Nakamoto

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The Correlation of Electrical Fields and Detonator Behavior

Bulletin of the American Physical Society (2017)

Zakary Wilde Elizabeth Francois John R. Gibson Rylie Lodes Teagan Nakamoto

Detonator

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Characterization of Detonator Performance as a Function of Porosity via the Hayes Effect via Rogowski Coil

Bulletin of the American Physical Society (2017)

Teagan Nakamoto Kristina Parrack Dalton Smith Chris Trujillo Zak Wilde

Characterization

Detonator

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Novel uses of detonator diagnostics

AIP conference proceedings (2018)

John R. Gibson Christopher Trujillo Teagan Nakamoto Dalton Smith Zak Wilde

A novel combination of diagnostics is being used to research the physics of detonator initiation. The explosive PETN (Pentaerythritol tetranitrate) commonly used in detonators, is also a piezo-electric material that, when sufficiently shocked, emits an electromagnetic field in the radio frequency (RF) range, along crystal fracture planes. In an effort to capture this RF signal, a new diagnostic was created. A copper foil, used as an RF antenna, was wrapped around a foam fixture encompassing a PETN pellet. Rogowski coils were used to obtain the change in current with respect to time (di/dt) the detonator circuit, in and polyvinylidene difluoride (PVDF) stress sensors were used to capture shockwave arrival time. The goal of these experiments is to use these diagnostics to study the reaction response of a PETN pellet of known particle size to shock loading with various diagnostics including an antenna to capture RF emissions. Our hypothesis is that RF feedback may signify the rate of deflagration to detonation transition (DDT) or lack thereof. The new diagnostics and methods will be used to determine the timing of start of current, bridge burst, detonator breakout timing and RF generated from detonation. These data will be compared to those of currently used diagnostics in order to validate the accuracy of these new methods. Future experiments will incorporate other methods of validation including dynamic radiography, optical initiation and use of magnetic field sensors.

Detonator

Pentaerythritol tetranitrate

10.1063/1.5044972

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Rogowski coils for studies of detonator initiation and other diagnostics

OSTI OAI (U.S. Department of Energy Office of Scientific and Technical Information) (2017)

Douglas Tasker Patrick R. Bowden Elizabeth Francois John R. Gibson Teagan Nakamoto

Detonator

10.1063/1.5045027

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