The investigation of electromagnetic processes in electromagnetic launchers using colossal magnetoresistance sensors

Liebfried, Oliver

doi:10.20334/1880-m

Cited by 6 publications

References 109 publications

(120 reference statements)

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Velocity-induced current profiles inside the rails of an electric launcher

Liebfried

Schneider

Stankevič

et al. 2012

2012 16th International Symposium on Electromagnetic Launch Technology

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Previous investigations showed that an array of novel CMR-B-scalar sensors based on the Colossal Magnetoresistance effect can be used to measure the magnetic field distribution in the vicinity of the rails of a railgun. However, the data obtained suffered from electromagnetic interference. Therefore, the measurement system was considerably improved with respect to the signal quality. In this publication the results obtained during the dynamic operation of the ISL railgun RAFIRA are presented. The magnetic field distribution in the vicinity of the rails was measured at different armature velocities. Additional information was obtained using high-speed camera snapshots. The experimental results are compared with simulations performed with the finite element code COMSOL Multiphysics. In particular, the influence of the armature current on the measurements is discussed. It is concluded that the magnetic field distribution in the vicinity of the rails clearly indicates an increased current concentration in the rear part of the armature-rail contact interface. Moreover, the current concentration depends on the speed of the armature. Velocitydependent skin depths at the surface of aluminum (Dural) rails for projectile velocities ranging between 750 m/s and 1500 m/s are given.

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Velocity-induced current profiles inside the rails of an electric launcher

Liebfried

Schneider

Stankevič

et al. 2012

2012 16th International Symposium on Electromagnetic Launch Technology

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Distributed laboratory system for characterization of current distribution in electromagnetic rail launchers

Tellini

Marracci

Ferrero

et al. 2011

2011 IEEE International Workshop on Measurements and Networking Proceedings (M&N)

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This paper presents the activity of a Distributed Measurement Laboratory on a challenging topic: the characterization of current distribution in electromagnetic rail launchers. Such experiments are characterized by strong transient magnetic fields, very fast moving conductors and the use of pulsed power in the GW range. Due to the high complexity of the investigated phenomenon an international network of laboratories is seen as an appropriate approach. The development of a proper network technology and a common platform is an important aspect to make the distributed measurement system efficient. Currently, various European laboratories have formed the European Pulsed Power Laboratories (EPPL) in order to improve their individual capacities and to develop networking measurement systems in the field of pulsed power R&D

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