Overview of equilibrium reconstruction on DIII-D using new measurements from an expanded motional Stark effect diagnostic

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Motional Stark effect (MSE) measurements constrain equilibrium reconstruction of DIII-D tokamak plasmas using the equilibrium code EFIT. In 2007, two new MSE arrays were brought online, bringing the system to three core arrays, two edge arrays, and 64 total channels. We present the first EFIT reconstructions using this expanded system. Safety factor and E{sub R} profiles produced by fitting to data from the two new arrays and one of the other three agree well with independent measurements. Comparison of the data from the three arrays that view the core shows that one of the older arrays is inconsistent with the ... continued below

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Holcomb, C; Makowski, M; Allen, S; Meyer, W & Van Zeeland, M May 2, 2008.

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Motional Stark effect (MSE) measurements constrain equilibrium reconstruction of DIII-D tokamak plasmas using the equilibrium code EFIT. In 2007, two new MSE arrays were brought online, bringing the system to three core arrays, two edge arrays, and 64 total channels. We present the first EFIT reconstructions using this expanded system. Safety factor and E{sub R} profiles produced by fitting to data from the two new arrays and one of the other three agree well with independent measurements. Comparison of the data from the three arrays that view the core shows that one of the older arrays is inconsistent with the other two unless the measured calibration factors for this array are adjusted. The required adjustments depend on toroidal field and plasma current direction, and on still other uncertain factors that change as the plasma evolves. We discuss possible sources of calibration error for this array.

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PDF-file: 16 pages; size: 1.4 Mbytes

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  • Presented at: 17th Topical Conference High-Temperature Plasma Diagnostics, Albuquerque, NM, United States, May 11 - May 15, 2008

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  • Report No.: LLNL-PROC-403437
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 938506
  • Archival Resource Key: ark:/67531/metadc895206

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  • May 2, 2008

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  • Sept. 27, 2016, 1:39 a.m.

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  • Dec. 9, 2016, 8:15 p.m.

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Holcomb, C; Makowski, M; Allen, S; Meyer, W & Van Zeeland, M. Overview of equilibrium reconstruction on DIII-D using new measurements from an expanded motional Stark effect diagnostic, article, May 2, 2008; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc895206/: accessed October 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.