PPPL-3607 is available in <a href="PPPL-3607.pdf">pdf</a> or 
<a href="PPPL-3607.ps">postscript</a> formats.

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<b>Application of Stark Tuned Laser for Interferometry and Polarimetry in Plasmas</b>
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<b>Authors:</b> H.K. Park, K.C. Lee, B. Deng, C.W. Domier, M. Johnson, B. Nathan, and N.C. Luhmann, Jr. 
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<b>Date of PPPL Report:</b> September 2001  
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<b>Presented at:</b> the Tenth International Symposium on Laser-aided Plasma Diagnostics, September 24th through the 28th, 2001, in Fukuoka Japan. </p>


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A Stark-tuned optically pumped far-infrared CH<sub>3</sub>OH laser at 119 <FONT FACE = "symbol">m</FONT FACE>m has been successfully applied in the Far Infrared Tangential Interferometer/Polarimeter (FIReTIP) system for the National Spherical Torus Experiment (NSTX). The system will provide temporally and radially resolved 2-D electron density profile [n<sub>e</sub>(r,t)] and toroidal field profile [B<sub>T</sub>(r,t)] data. In the 2001 campaign, a single channel interferometer system has been operated and tested for the Faraday rotation measurement. A plan for improvement and upgrading of the FIReTIP is discussed.



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