High-Velocity Flyer-Plate Developments on Two High-Pulsed-Power Generators Based on a Strip-Line Design (GEPI and CEPAGE)

Lefrançois, Alexandre; Chanal, P.-Y.; Blanc, Gaël Le; Petit, J.; Avrillaud, G.; Delchambre, M.

doi:10.1109/tps.2010.2081382

Cited by 25 publications

(11 citation statements)

References 8 publications

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“…This low inductance generator has been initially designed to perform quasi-isentropic experiments on inert materials and impact studies using high velocity flyer plates. [14][15][16] The primary storage is made of 28 stages connected in parallel, and simultaneously triggered (cf. Fig.…”

Section: Spalling Tests At Very High Strain-ratesmentioning

confidence: 99%

Dynamic tensile fracture of mortar at ultra-high strain-rates

Erzar

Buzaud

Chanal

2013

Journal of Applied Physics

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Influences of reflow time and strain rate on interfacial fracture behaviors of Sn-4Ag/Cu solder joints J. Appl. Phys. 112, 064508 (2012); 10.1063/1.4754016Time-resolved dynamic compaction and tensile fracture of low-porosity aluminum under impact loading During the lifetime of a structure, concrete and mortar may be exposed to highly dynamic loadings, such as impact or explosion. The dynamic fracture at high loading rates needs to be well understood to allow an accurate modeling of this kind of event. In this work, a pulsed-power generator has been employed to conduct spalling tests on mortar samples at strain-rates ranging from 2 Â 10 4 to 4 Â 10 4 s À1 . The ramp loading allowed identifying the strain-rate anytime during the test. A power law has been proposed to fit properly the rate-sensitivity of tensile strength of this cementitious material over a wide range of strain-rate. Moreover, a specimen has been recovered damaged but unbroken. Micro-computed tomography has been employed to study the characteristics of the damage pattern provoked by the dynamic tensile loading. V C 2013 AIP Publishing LLC.

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Section: Spalling Tests At Very High Strain-ratesmentioning

confidence: 99%

Dynamic tensile fracture of mortar at ultra-high strain-rates

Erzar

Buzaud

Chanal

2013

Journal of Applied Physics

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“…The load consists of a set of conductors that form an inductive short circuit [1][2][3][30][31][32][33][34][35][36][37][38][39][40][41]. The current delivered to such a load creates a magnetic pressure between the load's conductors, which is used to drive the experiment.…”

Section: Conceptual Design Of Neptunementioning

confidence: 99%

“…The success of these experiments has motivated the development of a number of megampere-class pulsed-power accelerators that are optimized for material-science research [30][31][32][33][34][35][36]. These machines deliver as much as 5 MA to a load and achieve pressures as high as 100 GPa.…”

Section: Introductionmentioning

confidence: 99%

Conceptual design of a1013-W pulsed-power accelerator for megajoule-class dynamic-material-physics experiments

Stygar¹,

Reisman²,

Stoltzfus³

et al. 2016

Phys. Rev. Accel. Beams

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We have developed a conceptual design of a next-generation pulsed-power accelerator that is optimized for megajoule-class dynamic-material-physics experiments. Sufficient electrical energy is delivered by the accelerator to a physics load to achieve-within centimeter-scale samples-material pressures as high as 1 TPa. The accelerator design is based on an architecture that is founded on three concepts: single-stage electrical-pulse compression, impedance matching, and transit-time-isolated drive circuits. The prime power source of the accelerator consists of 600 independent impedance-matched Marx generators. Each Marx comprises eight 5.8-GW bricks connected electrically in series, and generates a 100-ns 46-GWelectrical-power pulse. A 450-ns-long water-insulated coaxial-transmission-line impedance transformer transports the power generated by each Marx to a system of twelve 2.5-m-radius water-insulated conical transmission lines. The conical lines are connected electrically in parallel at a 66-cm radius by a water-insulated 45-post sextuple-posthole convolute. The convolute sums the electrical currents at the outputs of the conical lines, and delivers the combined current to a single solid-dielectric-insulated radial transmission line. The radial line in turn transmits the combined current to the load. Since much of the accelerator is water insulated, we refer to it as Neptune. Neptune is 40 m in diameter, stores 4.8 MJ of electrical energy in its Marx capacitors, and generates 28 TW of peak electrical power. Since the Marxes are transit-time isolated from each other for 900 ns, they can be triggered at different times to construct-over an interval as long as 1 μs-the specific load-current time history required for a given experiment. Neptune delivers 1 MJ and 20 MA in a 380-ns current pulse to an 18-mΩ load; hence Neptune is a megajoule-class 20-MA arbitrary waveform generator. Neptune will allow the international scientific community to conduct dynamic equation-of-state, phase-transition, mechanical-property, and other material-physics experiments with a wide variety of drive-pressure time histories.

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“…(i) high-velocity electromagnetic launchers such as the railgun, 1 (ii) the "slapper" flyer plate impact shock-wave systems 2 such as the recently developed AMPERE foil-flyer accelerator, 3 (iii) isentropic compression experimentation. 4 Many other examples can be found in a number of worldwide facilities that employ large high-current capacitor banks coupled to a load via strip-lines, with an extreme example being SHIVA STAR.…”

Section: Introductionmentioning

confidence: 99%

MIDOT: A novel probe for monitoring high-current flat transmission lines

Omar

Novac

Graneau

et al. 2016

Review of Scientific Instruments

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A novel inductive probe, termed MIDOT, was developed for monitoring high-current flat transmission lines. While being inexpensive the probe does not require calibration, is resistant to both shock waves and temperature variations, and it is easy to manufacture and mount. It generates strong output signals that are relatively easy to interpret and has a detection region limited to a pre-defined part of the transmission line. The theoretical background related to the MIDOT probes, together with their practical implementation in both preliminary experimentation and high-current tests, is also presented in the paper. The novel probe can be used to benchmark existing 2D numerical codes used in calculating the current distribution inside the conductors of a transmission line but can also easily detect an early movement of a transmission line component. The probe can also find other applications, such as locating the position of a pulsed current flowing through a thin wire.

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High-Velocity Flyer-Plate Developments on Two High-Pulsed-Power Generators Based on a Strip-Line Design (GEPI and CEPAGE)

Cited by 25 publications

References 8 publications

Dynamic tensile fracture of mortar at ultra-high strain-rates

Dynamic tensile fracture of mortar at ultra-high strain-rates

Conceptual design of a1013-W pulsed-power accelerator for megajoule-class dynamic-material-physics experiments

MIDOT: A novel probe for monitoring high-current flat transmission lines

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