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Comparison between Linear Electromagnetic Accelerators

100%
Siaenen T., Löffler M.
Acta Physica Polonica A
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2009
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vol. 115
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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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Thin Film Manganite-Metal Interconnection and "Loop Effect" Studies in CMR-Based High Magnetic Field Sensors

52%
Balevičius S., Stankevič V., Žurauskienė N., Šimkevičius Č., Liebfried O., Löffler M., Schneider M., Abrutis A., Plaušinaitienė V.
Acta Physica Polonica A
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2009
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vol. 115
|
issue 6
1133-1135
EN
The design, technology and main characteristics of Ag contacts as well as "loop effect" peculiarities of colossal magnetoresistance B-scalar high magnetic field sensor based on La_{1-x}(Ca)Sr_x MnO_3 films used for measuring high magnetic field pulses are presented.
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