Use of fast scopes to enable Thomson scattering measurement in presence of fluctuating plasma light.

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The addition of inexpensive high-speed oscilloscopes has enabled higher Te Thomson scattering measurements on the SSPX spheromak. Along with signal correlation techniques, the scopes allow new analyses based on the shape of the scattered laser pulse to discriminate against fluctuating background plasma light that often make gated-integrator measurements unreliable. A 1.4 J Nd:YAG laser at 1064 nm is the scattering source. Spatial locations are coupled by viewing optics and fibers to 4-wavelength-channel filter polychrometers. Ratios between the channels determine Te while summations of the channels determine density. Typically, the channel that provides scattered signal at higher Te is contaminated by ... continued below

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McLean, H; Moller, J & Hill, D April 19, 2004.

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The addition of inexpensive high-speed oscilloscopes has enabled higher Te Thomson scattering measurements on the SSPX spheromak. Along with signal correlation techniques, the scopes allow new analyses based on the shape of the scattered laser pulse to discriminate against fluctuating background plasma light that often make gated-integrator measurements unreliable. A 1.4 J Nd:YAG laser at 1064 nm is the scattering source. Spatial locations are coupled by viewing optics and fibers to 4-wavelength-channel filter polychrometers. Ratios between the channels determine Te while summations of the channels determine density. Typically, the channel that provides scattered signal at higher Te is contaminated by fluctuating background light. Individual channels are correlated with either a modeled representation of the laser pulse or a noise-free stray light signal to extract channel amplitudes.

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PDF-file: 18 pages; size: 1.2 Mbytes

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  • Journal Name: Review of Scientific Instruments, vol. 75, no. 10, October 7, 2004, pp. 3887

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  • Report No.: UCRL-JRNL-203651
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 892781
  • Archival Resource Key: ark:/67531/metadc881908

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  • April 19, 2004

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  • Sept. 21, 2016, 2:29 a.m.

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  • Dec. 2, 2016, 5:57 p.m.

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McLean, H; Moller, J & Hill, D. Use of fast scopes to enable Thomson scattering measurement in presence of fluctuating plasma light., article, April 19, 2004; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc881908/: accessed December 10, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.