Determination of wall reflectivity for ECE frequencies in DIII-D

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The significance of cyclotron radiation losses in next-generation tokamaks depends on the reflectivity of first wall materials. An experimental study of the effective reflectivity for electron cyclotron frequencies in the graphite-walled DIII-D tokamak is reported. Measurements of optically-thin harmonics ({omega} = n{omega}{sub ce}, n > 4) are made for two polarizations from thermal plasma discharges using an absolutely calibrated Michelson interferometer. The reflectivity r and polarization transfer fraction p are obtained by matching measured spectra to simulations from an ECE radiation transport code with adjustable wall parameters. For the frequency range 150-400 GHz average values of r = 0.76 and ... continued below

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8 p.

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Austin, M.E.; Ellis, R.F. & Luce, T.C. May 1, 1997.

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This article is part of the collection entitled: Office of Scientific & Technical Information Technical Reports and was provided by UNT Libraries Government Documents Department to Digital Library, a digital repository hosted by the UNT Libraries. It has been viewed 36 times . More information about this article can be viewed below.

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  • Austin, M.E.
  • Ellis, R.F. Univ. of Maryland, College Park, MD (United States). Institute for Plasma Research
  • Luce, T.C. General Atomics, San Diego, CA (United States)

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  • General Atomic Company
    Publisher Info: General Atomics, San Diego, CA (United States)
    Place of Publication: San Diego, California

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Description

The significance of cyclotron radiation losses in next-generation tokamaks depends on the reflectivity of first wall materials. An experimental study of the effective reflectivity for electron cyclotron frequencies in the graphite-walled DIII-D tokamak is reported. Measurements of optically-thin harmonics ({omega} = n{omega}{sub ce}, n > 4) are made for two polarizations from thermal plasma discharges using an absolutely calibrated Michelson interferometer. The reflectivity r and polarization transfer fraction p are obtained by matching measured spectra to simulations from an ECE radiation transport code with adjustable wall parameters. For the frequency range 150-400 GHz average values of r = 0.76 and p = 0.19 are found.

Physical Description

8 p.

Notes

INIS; OSTI as DE97007206

Source

  • 10. joint workshop on electron cyclotron emission and electron cyclotron resonance heating, Ameland (Netherlands), 6-11 Apr 1997

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  • Other: DE97007206
  • Report No.: GA--A22581
  • Report No.: CONF-970405--2
  • Grant Number: AC03-89ER51114;FG03-96ER54373;FC03-86ER52126
  • Office of Scientific & Technical Information Report Number: 513525
  • Archival Resource Key: ark:/67531/metadc699013

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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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  • May 1, 1997

Added to The UNT Digital Library

  • Aug. 14, 2015, 8:43 a.m.

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  • April 18, 2016, 5:59 p.m.

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Austin, M.E.; Ellis, R.F. & Luce, T.C. Determination of wall reflectivity for ECE frequencies in DIII-D, article, May 1, 1997; San Diego, California. (digital.library.unt.edu/ark:/67531/metadc699013/: accessed October 17, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.