A fast spectroscopic diagnostic for the measurement of plasma impurity ion dynamics
- Department of Physics, University of Wisconsin-Madison, 1150 University Avenue, Madison, Wisconsin 53706 (United States)
- Department of Nuclear Engineering and Engineering Physics, University of Wisconsin-Madison, 1500 Johnson Drive, Madison, Wisconsin 53706 (United States)
A high-resolution spectrometer has been developed and used to measure simultaneously impurity ion temperatures and flow velocities in high temperature plasmas with 10 [mu]s temporal resolution (limited by digitization rate). This device is actually a duo-spectrometer: measurements from two different chordal views of the plasma can be made simultaneously via two separate quartz input fiber optic bundles coupled to the entrance slits which are tilted to compensate for line curvature. The dispersed spectra on the exit plane of the duo-spectrometer are coupled via quartz fiber optics to two arrays of 16 photomultiplier tubes each. Measurements made by recording the Doppler broadened and shifted 227.091 nm emission from the C V impurity ions in the Madison Symmetric Torus (MST) reversed-field pinch (RFP) plasma have achieved precisions of [lt]6 eV for temperatures of 150 eV and [lt]0.7 km/s for flow velocities of 6 km/s. Representative results from the MST RFP indicate that the toroidal flow velocity drops and ion temperature increase during sawtooth events in MST.
- OSTI ID:
- 6930822
- Journal Information:
- Review of Scientific Instruments; (United States), Vol. 65:10; ISSN 0034-6748
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
PLASMA IMPURITIES
PLASMA DIAGNOSTICS
FIBER OPTICS
GAUSS FUNCTION
HOT PLASMA
ION TEMPERATURE
PHOTOMULTIPLIERS
SPECTROMETERS
FUNCTIONS
IMPURITIES
MEASURING INSTRUMENTS
PHOTOTUBES
PLASMA
700320* - Plasma Diagnostic Techniques & Instrumentation- (1992-)
700330 - Plasma Kinetics
Transport
& Impurities- (1992-)