q-profile measurements with motional stark effect in DIII-D

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Motional Stark Effect (MSE) has emerged as the most reliable technique for the measurement of q profiles in tokamaks equipped with neutral beams. On DIII-D, two separate 8-channel MSE instruments are utilized, giving 16 radial measurements. The viewing geometry for each instrument is designed to optimize radial resolution (1.5 cm < {delta}R < 6 cm) over the measurement range. Dual-frequency polarization modulators combined with lock-in detection provides maximum signal-to-noise with a time response of {approximately}1 ms. Special consideration has gone into the design of the collection optics to minimize undesirable polarization effects on reflectors and Faraday rotation in lenses. Examples ... continued below

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27 p.

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Rice, B. W. July 1, 1996.

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  • Rice, B. W. General Atomics, San Diego, CA (United States)

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Motional Stark Effect (MSE) has emerged as the most reliable technique for the measurement of q profiles in tokamaks equipped with neutral beams. On DIII-D, two separate 8-channel MSE instruments are utilized, giving 16 radial measurements. The viewing geometry for each instrument is designed to optimize radial resolution (1.5 cm < {delta}R < 6 cm) over the measurement range. Dual-frequency polarization modulators combined with lock-in detection provides maximum signal-to-noise with a time response of {approximately}1 ms. Special consideration has gone into the design of the collection optics to minimize undesirable polarization effects on reflectors and Faraday rotation in lenses. Examples of data from negative central magnetic shear, VH-mode, and sawtoothing discharges highlight the capabilities of the DIII-D MSE diagnostic.

Physical Description

27 p.

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INIS; OSTI as DE97000110

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  • 7. international Toki conference on plasma physics and controlled nuclear fusion (ITC-7): fusion plasma diagnostics, Toki City (Japan), 28 Nov - 1 Dec 1995

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  • Other: DE97000110
  • Report No.: GA--A22269
  • Report No.: CONF-951195--3
  • Grant Number: AC03-89ER51114;W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 420304
  • Archival Resource Key: ark:/67531/metadc680571

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Office of Scientific & Technical Information Technical Reports

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

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  • July 1, 1996

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  • July 25, 2015, 2:20 a.m.

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  • Aug. 1, 2016, 6:38 p.m.

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Rice, B. W. q-profile measurements with motional stark effect in DIII-D, article, July 1, 1996; San Diego, California. (digital.library.unt.edu/ark:/67531/metadc680571/: accessed October 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.