Impact of calibration technique on measurement accuracy for the JET core charge-exchange system

The core charge-exchange diagnostic at the Joint European Torus (JET) provides measurements of the impurity ion temperature T i , toroidal velocity V Φ , and impurity ion densities n imp , across the whole minor radius. A contribution to the uncertainty of the measured quantities is the error result...

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Bibliographic Details
Published in:Review of scientific instruments 2008-10, Vol.79 (10), p.10F525-10F525-5
Main Authors: Giroud, Carine, Meigs, A. G., Negus, C. R., Zastrow, K.-D., Biewer, T. M., Versloot, T. W.
Format: Article
Language:English
Subjects:
ACCURACY
ALIGNMENT
CALIBRATION
CHARGE EXCHANGE
ION TEMPERATURE
PHOTONS
PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
plasma spectroscopy calibration
STATISTICS
VELOCITY
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Summary:The core charge-exchange diagnostic at the Joint European Torus (JET) provides measurements of the impurity ion temperature T i , toroidal velocity V Φ , and impurity ion densities n imp , across the whole minor radius. A contribution to the uncertainty of the measured quantities is the error resulting from the multi-Gaussian fit and photon statistics, usually quoted for each measured data. Absolute intensity calibration and especially alignment of the viewing directions can introduce an important systematic error. The technique adopted at JET to reduce this systematic contribution to the error is presented in this paper. The error in T i , V Φ , and n imp is then discussed depending on their use.
ISSN:0034-6748
1089-7623
DOI:10.1063/1.2974806