OPTICAL DESIGN FOR Li BEAM ZEEMAN POLARIMETRY MEASUREMENTS ON DIII-D

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Measurements of the magnetic field pitch angle are obtained from the polarization characteristics of the {sigma} component of the Zeeman triplet of Li emission at 670.8 nm. A four element optical system images a horizontal Li beam on an array of 3 x 32, 1 mm diam. optical fibers, providing 32 spatial channels with 5 mm radial resolution in the plasma. Low Verdet constant glass is used for all optical elements near the DIII-D vessel to minimize the effects of Faraday rotation caused by stray magnetic fields. Before entering the fiber optics, the light passes through two crossed (45 degrees) ... continued below

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CARLSTROM, T.N.; THOMAS, D.M. & BREWIS, G. August 1, 2002.

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Measurements of the magnetic field pitch angle are obtained from the polarization characteristics of the {sigma} component of the Zeeman triplet of Li emission at 670.8 nm. A four element optical system images a horizontal Li beam on an array of 3 x 32, 1 mm diam. optical fibers, providing 32 spatial channels with 5 mm radial resolution in the plasma. Low Verdet constant glass is used for all optical elements near the DIII-D vessel to minimize the effects of Faraday rotation caused by stray magnetic fields. Before entering the fiber optics, the light passes through two crossed (45 degrees) photoelastic modulators (PEM) and a linear polarizer, which convert the various polarization states into an intensity modulated signal at the fundamental and 2nd harmonic of the PEM frequencies. For each spatial channel, light from a three fiber bundle is collimated and passes through a temperature tuned etalon (free spectral range, FSR = 0.3 nm; finesse, F = 5.7) in order to select only one {sigma} line of the triplet. The FSR is large enough to adequately cover the expected Zeeman triplet and small enough to achieve a low bandwidth (0.06 nm) at reasonably low F. A 1.0 nm wide interference filter is used to block all but 4-5 peaks of the etalon. The light is then focused on GaAs photo multiplier detectors. Details of the design and performance are presented.

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Medium: X; Size: 14 pages

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Oakland Operations Office, Oakland, CA (US); INIS

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  • 14th Topical Conference on High Temperature Plasma Diagnostics, Madison, WI (US), 07/08/2002--07/11/2002; Other Information: THIS IS A PREPRINT OF A PAPER PRESENTED AT THE 14TH TOPICAL CONFERENCE ON HIGH TEMPERATURE PLASMA DIAGNOSTICS, JULY 8-11,2002, MADISON, WISCONSIN, AND TO BE PUBLISHED IN THE'' PROCEEDINGS''

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  • Report No.: NONE
  • Grant Number: AC03-99ER54463
  • Office of Scientific & Technical Information Report Number: 804717
  • Archival Resource Key: ark:/67531/metadc735762

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Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • August 1, 2002

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  • Oct. 18, 2015, 6:40 p.m.

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  • April 19, 2016, 12:48 p.m.

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CARLSTROM, T.N.; THOMAS, D.M. & BREWIS, G. OPTICAL DESIGN FOR Li BEAM ZEEMAN POLARIMETRY MEASUREMENTS ON DIII-D, article, August 1, 2002; United States. (digital.library.unt.edu/ark:/67531/metadc735762/: accessed October 17, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.