Physics of solid armature launch transition into arc mode

Drobyshevski, E. M.; Rozov, S. I.; Zhukov, B. G.; Kurakin, R. O.; Beloborodyy, M V; Latypov, V G

doi:10.1109/20.911792

Cited by 10 publications

(1 citation statement)

References 12 publications

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“…While much progress has been reported for the C-shape armatures [1], other solid armatures are still being investigated [2], [3]. This is because the transition to arcing contact continues to be a problem for all types of solid armatures [3]- [5]. During the last decade, the ISL activities have focused predominantly on the use of metal fiber brush armatures [6]- [10].…”

Section: Introductionmentioning

confidence: 99%

Advanced Rail-Sabot Configurations for Brush Armatures

Schneider

2007

IEEE Trans. Magn.

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This paper reports on experimental results obtained at the ISL-railgun facility EMA3 (muzzle velocity 0 2 km/s, applied energy per shot prim 1 MJ, = 3 m, regular cal. = 15 mm 30 mm, (multiple) metal fiber brush armatures) from 2001 to 2005. Several techniques with the aim of investigating contact performance up to 2 km/s were developed during this period. These techniques include: 1) quasi-segmented and wedge shaped rail configurations, which vary the width of the rail as a function of the rail length in order to maximize the performance of multiple brush armatures; 2) separating sabot technique, for which the latest experimental results and some calculated figures of merit based on a simple model are presented; and 3) new contact materials for solving the problem of gouging at very high contact transition velocities. Some experimental results obtained with brush armatures are presented. The paper concludes by presenting detailed results of a representative shot combining all of the mentioned techniques and clearly demonstrating their capacities. A lower limit of the contact transition velocity of 1800 m/s has been observed, increasing the previously observed value of 1100 m/s significantly.

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Section: Introductionmentioning

confidence: 99%

Advanced Rail-Sabot Configurations for Brush Armatures

Schneider

2007

IEEE Trans. Magn.

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Modelling of magneto-electro-thermo-mechanical coupled behavior of the lubricating liquid film for the electromagnetic launch

Bao

Jin

Kou

et al. 2022

International Journal of Heat and Mass Transfer

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Probe characterization of high-current driven metal plasma in a vacuum-arc rail gun

Vijayan

Roychowdhury

Venkatramani

2004

Journal of Applied Physics

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The characteristics of metal plasma launched by high-current electric arc in a vacuum-arc rail gun are determined by employing electrical and magnetic probes. These measurements are validated by results from theoretical simulations. The arc coupled nonlinear circuit equations are solved simultaneously with the Newtonian arc motion and revealed the undercritically damped behavior of the arc current identical to the arc-current signal recorded by the Rogowski magnetic probe. Similarly the arc velocity and displacement derived from the signatures of B-dot probes are shown to concur closely with the results of J×B propulsion from simulation. The heating of plasma is formulated in a three-electron population regime with direct arc energy coupling through magnetohydrodynamic, ion-acoustic, Coulomb, and neutral interactions. This results in high temperature (Te) of hundreds of eV in the arc as revealed by the simulation. Hence Te of the rapidly cooling and equilibrating plasma that emerged from the muzzle is high around 80–90eV, which is confirmed by Langmuir electric probe measurements. Density ne of this metal plasma is shown to be in the range 4×1021–6×1021m−3 and includes multiple ion charge states. The exit velocity of the plasma measured by a pair of Langmuir probes is close to 2.2×106cm∕s and matched well with the arc velocity determined by the B-dot probes and the results from simulation.

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Physics of solid armature launch transition into arc mode

Cited by 10 publications

References 12 publications

Advanced Rail-Sabot Configurations for Brush Armatures

Advanced Rail-Sabot Configurations for Brush Armatures

Modelling of magneto-electro-thermo-mechanical coupled behavior of the lubricating liquid film for the electromagnetic launch

Probe characterization of high-current driven metal plasma in a vacuum-arc rail gun

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