Multichordal visible/near-UV spectroscopy on the DIII-D tokamak
A pair of visible/near-UV spectrometers with eight viewing chords apiece have been installed on the DIII-D tokamak. Each system views a neutral heating beam and can acquire up to 250 complete spectra from each chord with 5--20-ms time resolution. Each viewing chord covers 60 A with 0.27-A spectral resolution, and the chords span about (2)/(3) of the plasma's full width. By viewing Doppler-broadened spectral lines from charge exchange recombination (CER) reactions between beam neutrals and plasma ions, ion temperatures up to 4 keV have been measured, and the bulk Doppler shift of these same lines has yielded plasma rotation velocities up to 200 km/s. The constancy of temperature on a magnetic flux surface and the rigid rotor model of a flux surface have been confirmed. These instruments have also been used to measure the neutral beam deposition profile, and preliminary experimental results agree with theoretical calculations of the beam deposition profile.
- Research Organization:
- GA Technologies Inc., San Diego, California 92138
- OSTI ID:
- 7123642
- Journal Information:
- Rev. Sci. Instrum.; (United States), Vol. 59:8
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
DOUBLET-3 DEVICE
PLASMA DIAGNOSTICS
OPTICAL SPECTROMETERS
ULTRAVIOLET SPECTROMETERS
ION TEMPERATURE
LINE BROADENING
ROTATION
TIME RESOLUTION
CLOSED PLASMA DEVICES
MEASURING INSTRUMENTS
MOTION
RESOLUTION
SPECTROMETERS
THERMONUCLEAR DEVICES
TIMING PROPERTIES
TOKAMAK DEVICES
700102* - Fusion Energy- Plasma Research- Diagnostics