Page 15 - MHD Mode Identification by Higher Order Singular Value Decomposition in C-2W

Charge Exchange Recombination Spectroscopy (ChERS)
O4+ triplet near 278 nm
ChERS and Diag. Neutral Beam
i-ChERS
§ Passive Doppler Spectroscopy Diagnostic for § Impurity Ion Velocity (Doppler Shift)
§ Impurity Ion Temp (Doppler Broadening)
§ Impurity Ion Density (Line-strength)
§ Measured near midplane @ 10 kS/sec
§ 15 viewing chords target O4+ triplet @ 278 nm § See M. Nation’s poster for details
mChERS
q Hydrogen temperature measured using DNB
q Temp proportional to edge biasing voltage
q Signal levels small due to the use of saturation q Full signal fit instead of background subtraction q Uncertainty in wavelength shift (sμ) is large
q Currently improving spectrometer q See D. Gupta’s poster for details
Presenter: Thomas Roche – HTPD2020 Conference
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E1_NB7
E2_NB7 E3_NB7 FIDA H2O_NB7
D-Hot
D-Cold
H-Cold H2O_NB8 E3_NB8 E2_NB8 E1_NB8 H2O_DNB
E3_DNB E2_DNB
E1_DNB Impurity