EFDA-JET-CP(04)01/15

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

A local analysis technique is presented for the analysis of MSE data to deduce the safety factor q in tokamak discharges. The technique preserves the individuality of the 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, non-subjective, 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 behaviour of the produced results.
Name Size  
EFDC040115 507.84 Kb