Long-distance delivery of multi-channel polarization signals in nuclear fusion research

Jinseok Ko; Jinil Chung; Kyuhang Lee

doi:10.1117/12.2267563

23 April 2017 Long-distance delivery of multi-channel polarization signals in nuclear fusion research

Jinseok Ko, Jinil Chung, Kyuhang Lee

Proceedings Volume 10323, 25th International Conference on Optical Fiber Sensors; 103239D (2017) https://doi.org/10.1117/12.2267563
Event: 25th International Conference on Optical Fiber Sensors, 2017, Jeju, Korea, Republic of

Abstract

A polarization-preserving optical system that includes a dual photoelastic modulator (PEM) has been designed and fabricated for the motional Stark effect (MSE) diagnostic system which measures internal magnetic field structures inside the tokamak for the Korea Superconducting Tokamak Advanced Research. The collection optics located outside the vacuum window is composed of four lenses, a dielectric coated mirror, and a dichroic beam splitter in addition to the PEM and a polarizer. The fiber dissector is designed based on the focal plane that aligns 25 lines of sight, each of which constitutes a bundle of 19 600-μm fibers. The fibers run about 40 m from the front optics in the tokamak vacuum vessel to the detector in the diagnostic area remote from the tokamak hall. This takes the advantage of the fact that the polarization information is intensity-modulated once going through the PEM and the polarizer. The polarization signals measured by the MSE diagnostic successfully demonstrates its proof-of-principle physics that is critical in the stable and steady-state operation of the tokamak plasmas.

Citation Download Citation

Jinseok Ko, Jinil Chung, and Kyuhang Lee "Long-distance delivery of multi-channel polarization signals in nuclear fusion research", Proc. SPIE 10323, 25th International Conference on Optical Fiber Sensors, 103239D (23 April 2017); https://doi.org/10.1117/12.2267563

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