Upgraded Calibrations of the Thomson System at DIII-D

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The DIII-D Thomson system measures electron density and temperature with eight pulsed ND:YAG lasers along three paths through the plasma vessel. The components of the Thomson system are absolutely calibrated so the measurements can be combined into a single profile from a normalized plasma radius ({rho}) of about 0.1 to the edge of the plasma. A monochromator calibration and opto-electronic calibration measure the detectors' absolute sensitivity to background and pulsed light. A Rayleigh scattering calibration and transmission calibrations measure the transmission of light to the detectors. The calibration systems are being upgraded to reduce the effect of systematic errors on ... continued below

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Bray, B.; Hsieh, C.; Carlstrom, T.N. & Makariou, C.C. August 1, 2000.

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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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The DIII-D Thomson system measures electron density and temperature with eight pulsed ND:YAG lasers along three paths through the plasma vessel. The components of the Thomson system are absolutely calibrated so the measurements can be combined into a single profile from a normalized plasma radius ({rho}) of about 0.1 to the edge of the plasma. A monochromator calibration and opto-electronic calibration measure the detectors' absolute sensitivity to background and pulsed light. A Rayleigh scattering calibration and transmission calibrations measure the transmission of light to the detectors. The calibration systems are being upgraded to reduce the effect of systematic errors on the temperature and density measurements. The systematic errors can be checked by a comparison of overlapping channels and estimated from fits to the profiles. The contributions of the systematic uncertainties relative to the statistical uncertainties of the measurement are discussed through simulations and experimental data.

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Medium: P; Size: vp.

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INIS; OSTI as DE00766654

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  • 13th Topical Conference on High-Temperature Plasma Diagnostics, Tucson, AZ (US), 06/18/2000--06/22/2000

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  • Report No.: GA-A23440
  • Grant Number: AC03-99ER54463
  • Office of Scientific & Technical Information Report Number: 766654
  • Archival Resource Key: ark:/67531/metadc719936

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  • August 1, 2000

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  • Sept. 29, 2015, 5:31 a.m.

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  • April 18, 2016, 6:09 p.m.

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Bray, B.; Hsieh, C.; Carlstrom, T.N. & Makariou, C.C. Upgraded Calibrations of the Thomson System at DIII-D, article, August 1, 2000; San Diego, California. (digital.library.unt.edu/ark:/67531/metadc719936/: accessed August 21, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.