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Comparison between Linear Electromagnetic Accelerators

100%
Siaenen T., Löffler M.
Acta Physica Polonica A
|
2009
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vol. 115
|
issue 6
1089-1091
EN
For symmetric Taylor tests a 2 m long electromagnetic accelerator will be used to accelerate 100 g rods up to 300 m/s. Only a small variance of the muzzle parameters, velocity and exit time, is tolerable. In order to find the most reliable, simple and efficient accelerator type, an axial coilgun, a flat-channel accelerator and an augmented railgun are compared using a lumped parameter model. In particular, the accelerator mutual inductances and their gradients characterize the propulsive forces. The essential advantages of the flat-channel geometry over the axial coilgun geometry are shown. The geometric improvements of the flat-channel accelerator open the way for the augmented railgun suitable and effective for the planned application. To minimize the variance of the muzzle parameters, modular capacitor banks with semiconductor switches allow the dynamic control of the railgun current, in principle.
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Measurement of the Magnetic Field Distribution in Railguns Using CMR-B-Scalar Sensors

51%
Liebfried O., Schneider M., Loeffler M., Balevičius S., Žurauskienė N., Stankevič V.
Acta Physica Polonica A
|
2009
|
vol. 115
|
issue 6
1125-1127
EN
Colossal magnetoresistance effect B-scalar magnetic field sensors with effective areas of 0.05 mm^2 were used very close to the rails for magnetic field measurements. These measurements were performed during static and dynamic railgun experiments. In static experiments three different rail materials were used and the results are compared to a finite element simulation.
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