Motional Stark effect imaging first results on the DIII-D tokamak

Alex Thorman, Clive Michael, John Howard, Brian Victor, Chris Holcomb, Steve Allen

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    1 Citation (Scopus)


    A motional Stark effect (MSE) imaging diagnostic was benchmarked against existing conventional MSE polarimeters on the DIII-D tokamak and delivered new capabilities for measuring the magnetic pitch angle from 2 neutral beams and on the high field side of DIII-D. Line integration across flux surfaces was considerable for the radial view utilised; nevertheless, the imaging MSE measurements from both beams were self-consistent and in close agreement with conventional MSE measurements. The ferroelectric liquid crystal waveplate used in the imaging polarimeter was discovered to have spatially non-uniform retardance; hence, it is necessary for the calibration source to replicate the ray paths of the neutral beam emission through the optical system.

    Original languageEnglish
    Article number10D124
    JournalReview of Scientific Instruments
    Issue number10
    Publication statusPublished - 1 Oct 2018


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