An Overview Of The Motional Stark Effect Diagnostic On DIII-D And Design Work For An ITER MSE

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The advanced tokamak research program at DIII-D relies critically on the measurement of the current density profile. This was made possible by the development of a Motional Stark Effect (MSE) polarimeter that was first installed in 1992. Three major upgrades have since occurred, and improvements in our understanding of critical performance issues and calibration techniques are ongoing. In parallel with these improvements, we have drawn on our DIII-D experience to begin studies and design work for MSE on burning plasmas and ITER. This paper first reviews how Motional Stark Effect polarimetry (MSE) is used to determine the tokamak current profile. ... continued below

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Holcomb, C T; Allen, S L; Makowski, M A; Jayakumar, R J; Gu, M F; Lerner, S et al. September 20, 2007.

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The advanced tokamak research program at DIII-D relies critically on the measurement of the current density profile. This was made possible by the development of a Motional Stark Effect (MSE) polarimeter that was first installed in 1992. Three major upgrades have since occurred, and improvements in our understanding of critical performance issues and calibration techniques are ongoing. In parallel with these improvements, we have drawn on our DIII-D experience to begin studies and design work for MSE on burning plasmas and ITER. This paper first reviews how Motional Stark Effect polarimetry (MSE) is used to determine the tokamak current profile. It uses the DIII-D MSE system as an example, and shows results from the latest upgrade that incorporates an array of channels from a new counter-Ip injected neutral beam. The various calibration techniques presently used are reviewed. High-leverage or unresolved issues affecting MSE performance and reliability in ITER are discussed. Next, we show a four-mirror collection optics design for the two ITER MSE views. Finally, we discuss measurements of the polarization properties of a few candidate mirrors for the ITER MSE.

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PDF-file: 6 pages; size: 7.9 Mbytes

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  • Presented at: International Workshop on Burning Plasma Diagnostics, Varenna, Italy, Sep 24 - Sep 28, 2007

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  • Report No.: UCRL-CONF-234811
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 922115
  • Archival Resource Key: ark:/67531/metadc895071

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  • September 20, 2007

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  • Sept. 27, 2016, 1:39 a.m.

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  • Dec. 7, 2016, 6:39 p.m.

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Holcomb, C T; Allen, S L; Makowski, M A; Jayakumar, R J; Gu, M F; Lerner, S et al. An Overview Of The Motional Stark Effect Diagnostic On DIII-D And Design Work For An ITER MSE, article, September 20, 2007; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc895071/: accessed July 20, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.