Far infrared fusion plasma diagnostics

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Over the last several years, reflectometry has grown in importance as a diagnostic for both steady-state density Profiles as well as for the investigation of density fluctuations and turbulence. As a diagnostic for density profile measurement, it is generally believed to be well understood in the tokamak environment. However, its use as a fluctuation diagnostic is hampered by a lack of quantitative experimental understanding of its wavenumber sensitivity and spatial resolution. Several researchers, have theoretically investigated these questions. However, prior to the UCLA laboratory investigation, no group has experimentally investigated these questions. Because of the reflectometer's importance to the world ... continued below

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Pages: (89 p)

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Luhmann, N.C. Jr. & Peebles, W.A. January 1, 1990.

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Description

Over the last several years, reflectometry has grown in importance as a diagnostic for both steady-state density Profiles as well as for the investigation of density fluctuations and turbulence. As a diagnostic for density profile measurement, it is generally believed to be well understood in the tokamak environment. However, its use as a fluctuation diagnostic is hampered by a lack of quantitative experimental understanding of its wavenumber sensitivity and spatial resolution. Several researchers, have theoretically investigated these questions. However, prior to the UCLA laboratory investigation, no group has experimentally investigated these questions. Because of the reflectometer's importance to the world effort in understanding plasma turbulence and transport, UCLA has, over the last year, made its primary Task IIIA effort the resolution of these questions. UCLA has taken the lead in a quantitative experimental understanding of reflectometer data as applied to the measurement of density fluctuations. In addition to this, work has proceeded on the design, construction, and installation of a reflectometer system on UCLA's CCT tokamak. This effort will allow a comparison between the improved confinement regimes (H-mode) observed on both the DIII-D and CCT machines with the goal of achieving a physics understanding of the phenomena. Preliminary investigation of a new diagnostic technique to measure density profiles as a function of time has been initiated at UCLA. The technique promises to be a valuable addition to the range of available plasma diagnostics. Work on advanced holographic reflectometry technique as applied to fluctuation diagnostics has awaited a better understanding of the reflectometer signal itself as discussed above. Efforts to ensure the transfer of the diagnostic developments have continued with particular attention devoted to the preliminary design of a multichannel FIR interferometer for MST.

Physical Description

Pages: (89 p)

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OSTI; NTIS; GPO Dep.

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  • Other: DE93002531
  • Report No.: DOE/ER/53225-T6
  • Grant Number: FG03-86ER53225
  • DOI: 10.2172/7011189 | External Link
  • Office of Scientific & Technical Information Report Number: 7011189
  • Archival Resource Key: ark:/67531/metadc1182939

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Office of Scientific & Technical Information Technical Reports

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  • January 1, 1990

Added to The UNT Digital Library

  • July 2, 2018, 10:52 p.m.

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  • July 26, 2018, 10:29 p.m.

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Luhmann, N.C. Jr. & Peebles, W.A. Far infrared fusion plasma diagnostics, report, January 1, 1990; United States. (https://digital.library.unt.edu/ark:/67531/metadc1182939/: accessed July 17, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.