TITLE

Point-to-point analysis of MSE data for plasma diagnostics and control

AUTHOR(S)
Giannella, R.; Hawkes, N. C.; Jayakumar, R.; Makowski, M.; Zabeo, L.
PUB. DATE
October 2004
SOURCE
Review of Scientific Instruments;Oct2004 Part I & II, Vol. 75 Issue 10, p4247
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
A local analysis technique is presented for the analysis of MSE data to deduce the safety factor q in tokamak discharges. The technique preserves as much as possible the individuality of every single measure by a simple rule of translation of magnetic field pitch angle measurements into q-values. Based on a geometric approach, and the observation that the flux surfaces shapes are strongly constrained by that of the last closed flux surface (LCFS), by the position of the magnetic axis and by a few more global parameters, it provides a robust, nonsubjective, accurate technique that is useful for the experimental study of q-profiles and for the evaluation of its uncertainties. It also provides a useful tool for plasma control experiments as it does not submit data to a preliminary search of minima in a multi-parametric domain, a procedure that may lead to jumps in the time behavior of the produced results.
ACCESSION #
14842105

 

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