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Title: A fast spectroscopic diagnostic for the measurement of plasma impurity ion dynamics

Abstract

A high-resolution spectrometer has been developed and used to measure simultaneously impurity ion temperature 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. Measurement made by recording the Doppler broadened and shifted 227.091 nm emission from the CV impurity ions in the MST reversed-field pinch (RFP) plasma have achieved precisions of <6 eV for temperatures of 150 Ev and <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 increases during saw tooth events in MST.

Authors:
;
Publication Date:
Research Org.:
Univ. of Wisconsin, Madison, WI (United States)
Sponsoring Org.:
USDOE, Washington, DC (United States)
OSTI Identifier:
10155525
Report Number(s):
DOE/ER/53198-238
ON: DE94012985; BR: AT051011A/AT0530020; TRN: 94:012120
DOE Contract Number:  
FG02-85ER53198
Resource Type:
Technical Report
Resource Relation:
Other Information: PBD: Apr 1994
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; MST DEVICE; ION TEMPERATURE; PLASMA IMPURITIES; SPECTROMETERS; DESIGN; PERFORMANCE; PLASMA DIAGNOSTICS; IONS; VELOCITY; HOT PLASMA; PLASMA DRIFT; SAWTOOTH OSCILLATIONS; 700320; 700330; PLASMA DIAGNOSTIC TECHNIQUES AND INSTRUMENTATION; PLASMA KINETICS, TRANSPORT, AND IMPURITIES

Citation Formats

Den Hartog, D J, and Fonck, R J. A fast spectroscopic diagnostic for the measurement of plasma impurity ion dynamics. United States: N. p., 1994. Web. doi:10.2172/10155525.
Den Hartog, D J, & Fonck, R J. A fast spectroscopic diagnostic for the measurement of plasma impurity ion dynamics. United States. https://doi.org/10.2172/10155525
Den Hartog, D J, and Fonck, R J. 1994. "A fast spectroscopic diagnostic for the measurement of plasma impurity ion dynamics". United States. https://doi.org/10.2172/10155525. https://www.osti.gov/servlets/purl/10155525.
@article{osti_10155525,
title = {A fast spectroscopic diagnostic for the measurement of plasma impurity ion dynamics},
author = {Den Hartog, D J and Fonck, R J},
abstractNote = {A high-resolution spectrometer has been developed and used to measure simultaneously impurity ion temperature 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. Measurement made by recording the Doppler broadened and shifted 227.091 nm emission from the CV impurity ions in the MST reversed-field pinch (RFP) plasma have achieved precisions of <6 eV for temperatures of 150 Ev and <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 increases during saw tooth events in MST.},
doi = {10.2172/10155525},
url = {https://www.osti.gov/biblio/10155525}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Fri Apr 01 00:00:00 EST 1994},
month = {Fri Apr 01 00:00:00 EST 1994}
}