2023 BFY4 Abstract Detail Page
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| Abstract Title: |
W07: Pulsed Faraday Rotation |
| Abstract: |
Faraday Rotation is a phenomenon showing that magnetism and light are related, in that the polarization properties of a medium are affected by the presence of a static magnetic field. The rotation of the plane of polarization of light by a modest B-field is typically a small effect; but this variant of 'Pulsed Faraday Rotation' uses an ordinary (and commercially available) apparatus together with a new prototype pulsed-current supply to excite the solenoid. The use of brief (<10 ms) pulses allows the solenoid to be exposed to currents of peak value near 50 A, about 10-fold larger than any steady current that could safely be used. Faraday rotations of >45 degrees are readily obtained; this allows the design and description of Faraday isolators. Students using this sort of apparatus will learn how electrical energy can be capacitively stored and then (safely) discharged in brief high-current pulses. They will learn techniques of data acquisition for brief single events, including the art of triggered acquisition. They will learn two independent techniques for quantifying pulsed large magnetic fields, and they will learn the modelling required to interpret experiments in the transmission of polarized light to infer instantaneous Faraday rotation. |
| Abstract Type: |
Workshop
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Author/Organizer Information |
| Primary Contact: |
R. Seth Smith
Francis Marion University
Florence, SC 29506
|
Co-Author(s)
and Co-Presenter(s) |
David A. Van Baak, TeachSpin Inc.
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