Page 16 - MHD Mode Identification by Higher Order Singular Value Decomposition in C-2W

Spatial Heterodyne Spectroscopy Measures Impurity ExB Drift
• Diffraction gratings are placed at an angle near Littrow angle.
• Wavelengths near Littrow wavelength produce fringe patterns on detector
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I(x)=òB(s){1+cos[2p(4(s -s0)tanqLx]}ds
Interferogram
Lineout of Interferogram
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SHS system views the plasma in divertor in jet-outflow region
Summary of Observations
§ Impurity rotation velocity in inner divertor measured by Czerny-Turner spectrometer
§ Drop in radial electric field in the inner divertor obtained from drift equation: ∆𝑉 = ∆"×$, ∆𝐸 = 3.9 𝑘𝑉/𝑚
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§ See D. Sheftman’s poster for details
Presenter: Thomas Roche – HTPD2020 Conference
Calculation of impurity rotational velocity and temperature from spectrum
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O4+ Impurity Emission
V=7km/s T=237 eV