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Measurement of Poloidal Velocity on the National Spherical Torus Experiment [electronic resource].

Published:
Washington, D.C. : United States. Dept. of Energy, 2010.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Physical Description:
197Kb : digital, PDF file
Additional Creators:
Princeton University. Plasma Physics Laboratory, United States. Department of Energy, United States. Department of Energy. Office of Science, and United States. Department of Energy. Office of Scientific and Technical Information
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Summary:
A diagnostic suite has been developed to measure impurity poloidal flow using charge exchange recombination spectroscopy on the National Spherical Torus Experiment. Toroidal and poloidal viewing systems measure all quantities required to determine the radial electric field. Two sets of up/down symmetric poloidal views are used to measure both active emission in the plane of the neutral heating beams and background emission in a radial plane away from the neutral beams. Differential velocity measurements isolate the line-integrated poloidal velocity from apparent flows due to the energy-dependent chargeexchange cross section. Six f/1.8 spectrometers measure 276 spectra to obtain 75 active and 63 background channels every 10 ms. Local measurements from a similar midplane toroidal viewing system are mapped into two dimensions to allow the inversion of poloidal line-integrated measurements to obtain local poloidal velocity profiles. Radial resolution after inversion is 0.6-1.8 cm from the plasma edge to the center.
Report Numbers:
E 1.99:pppl-4525
pppl-4525
Subject(s):
Other Subject(s):
Note:
Published through SciTech Connect.
06/04/2010.
"pppl-4525"
Ronald E. Bell and Russell Feder.
Funding Information:
DE-ACO2-09CH11466
View MARC record | catkey: 14738127