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Proceedings Paper

A Michelson Interferometer/Polarimeter On The Tokamak Fusion Test Reactor (TFTR)
Author(s): H. K. Park; D. K. Mansfield; L. C. Johnson; C. H . Ma
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Paper 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.

Paper Details

Date Published: 6 October 1987
PDF: 4 pages
Proc. SPIE 0787, Optical Techniques for Sensing and Measurement in Hostile Environments, (6 October 1987); doi: 10.1117/12.940691
Show Author Affiliations
H. K. Park, Princeton University (United States)
D. K. Mansfield, Princeton University (United States)
L. C. Johnson, Princeton University (United States)
C. H . Ma, Oak Ridge National Laboratory (United States)

Published in SPIE Proceedings Vol. 0787:
Optical Techniques for Sensing and Measurement in Hostile Environments
Calvin H. Gillespie; Roger A. Greenwell, Editor(s)

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