Abstract
The generation and measurement of intense pulsed magnetic fields are being investigated at the Air Force Weapons Laboratory using a 1.3 MJ, 1.4 μsec current risetime capacitator bank. The machine is discharged axially through a cylindrical metal coated foil resulting in a foil plasma implosion. An axial magnetic field injected into the interior of the foil prior to implosion is greatly compressed by the imploding foil. Measurements of the resulting high magnetic fields are obtained using conventional Ḃ probes made of wire loops and also using Faraday probes. The cylindrical glass Faraday probes are traversed axially by a 1.5 watt argon laser beam. The Faraday rotation of the E vector in the laser beam is analyzed with a Polaroid filter and a subnanosecond response photodiode. Collimation and wavelength filters are used to increase the signal relative to the noise. Low Verdet constant glass was chosen for use in the Faraday probes. This choice eases the high frequency responce characteristics required of the oscilloscope measuring the photodiode response. Comparison of the Ḃ and Faraday probe responses is given.
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