Plasma rotation measurement in small tokamaks using an optical spectrometer and a single photomultiplier as detector

The method for plasma rotation measurement in the tokamak TCABR is reported in this article. During a discharge, an optical spectrometer is used to scan sequentially spectral lines of plasma impurities and spectral lines of a calibration lamp. Knowing the scanning velocity of the diffraction grating...

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Bibliographic Details
Published in:Review of scientific instruments 2007-04, Vol.78 (4), p.043509-043509-5
Main Authors: Severo, J. H. F., Nascimento, I. C., Kuznetov, Yu K., Tsypin, V. S., Galvão, R. M. O., Tendler, M.
Format: Article
Language:English
Subjects:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ACCURACY
CALIBRATION
DIFFRACTION GRATINGS
DOPPLER EFFECT
ELECTRIC POTENTIAL
IONS
NEOCLASSICAL TRANSPORT THEORY
neutral-beam injection
OPTICAL SPECTROMETERS
PHOTOMULTIPLIERS
PLASMA CONFINEMENT
PLASMA DIAGNOSTICS
PLASMA IMPURITIES
radial electric-field
ROTATING PLASMA
TCABR TOKAMAK
toroidal rotation
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Summary:The method for plasma rotation measurement in the tokamak TCABR is reported in this article. During a discharge, an optical spectrometer is used to scan sequentially spectral lines of plasma impurities and spectral lines of a calibration lamp. Knowing the scanning velocity of the diffraction grating of the spectrometer with adequate precision, the Doppler shifts of impurity lines are determined. The photomultiplier output voltage signals are recorded with adequate sampling rate. With this method the residual poloidal and toroidal plasma rotation velocities were determined, assuming that they are the same as those of the impurity ions. The results show reasonable agreement with the neoclassical theory and with results from similar tokamaks.
ISSN:0034-6748
1089-7623
1089-7623
DOI:10.1063/1.2723749