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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 contained 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 behaviour of the produced results.

Additional information

Authors: GIANNELLA R, Departement de Recherches sur la Fusion Controlee, Association Euratom-CEA sur la Fusion, CEA Cadarache, Saint-Paul-lez-Durance (FR);ZABEO L, Departement de Recherches sur la Fusion Controlee, Association Euratom-CEA sur la Fusion, CEA Cadarache, Saint-Paul-lez-Durance (FR);HAWKES N, EURATOM-UKAEA Fusion Association, Culham Science Centre, Abingdon (GB);JAYAKUMAR R, Lawrence Livermore National Laboratory, Livermore (US);MAKOWSKI M, Lawrence Livermore National Laboratory, Livermore (US)
Bibliographic Reference: An oral paper given at: 15th Topical Conference on High-Temperature Plasma Diagnostics Organised by: General Atomics Held at: Hyatt Regency Islandia Hotel San Diego (US)
Availability: Available from Association EURATOM-CEA, Departement de Recherches sur la Fusion Controlee, CEA Cadarache, F-13108 St Paul-Lez-Durance, France Tel: (+33) 4 42 25 70 01; Fax: (+33) 4 42 25 64 21 E-mail: dirdrfc@drfc.cad.cea.fr
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