A Michelson Interferometer/Polarimeter On The Tokamak Fusion Test Reactor (TFTR)

H. K. Park; D. K. Mansfield; L. C. Johnson; C. H . Ma

doi:10.1117/12.940691

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6 October 1987 A Michelson Interferometer/Polarimeter On The Tokamak Fusion Test Reactor (TFTR)

H. K. Park, D. K. Mansfield, L. C. Johnson, C. H . Ma

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Proceedings Volume 0787, Optical Techniques for Sensing and Measurement in Hostile Environments; (1987) https://doi.org/10.1117/12.940691
Event: 1987 Technical Symposium Southeast on Optics, Electro-Optics, and Sensors, 1987, Orlando, FL, United States

Abstract

A multichannel interferometer/polarimeter for the Tokamak Fusion Test Reactor (TFTR) has been developed in order to study the time dependent plasma current density (Jp) and electron density (ne) profile simultaneously. The goal of the TFTR is demonstration of breakeven via deuterium and tritium (DT) plasma. In order to be operated and maintained during DT operation phase, the system is designed based on the Michelson geometry which possesses intrinsic standing wave problems. So far, there has been no observable signals due to these standing waves. However, a standing wave resulted from the beam path design to achieve a optimum use of the laser power was found. This standing wave has not prevented initial 10 channel interferometer operation. However, a single channel polarimeter test indicated this standing wave was fatal for Faraday rotation measurements. Techniques employing 1/2 wave plates and polarizers have been applied to eliminate this standing wave problem. The completion of 10 channel Faraday rotation measurements may be feasible in the near future.

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H. K. Park, D. K. Mansfield, L. C. Johnson, and C. H . Ma "A Michelson Interferometer/Polarimeter On The Tokamak Fusion Test Reactor (TFTR)", Proc. SPIE 0787, Optical Techniques for Sensing and Measurement in Hostile Environments, (6 October 1987); https://doi.org/10.1117/12.940691

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