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Automation of Mode Locking in a Nonlinear Polarization Rotation Fiber Laser through Output Polarization Measurements
Published on: February 28, 2016
Plasma current measurements by Faraday rotation in a single-mode fiber
Abstract:
We report measurements of the toroidal plasma current in the high-beta tokamak SPICA II using a magnetooptic current sensor. Both the sine and cosine components of the angle of rotation are recorded during the current pulse. In this way, the overall accuracy is increased and a computer algorithm can be employed to calculate the value of the current. The effect of linear birefringence is taken into account. The system has a resolution of 1 kA, and a frequency range of DC to 1 MHz. The measured values of the plasma current (up to 350 kA) are in good agreement with the results of a Rogowski coil.
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