Author/Authors :
De Angelis، نويسنده , , R. and Baruzzo، نويسنده , , M. and Buratti، نويسنده , , P. and Alper، نويسنده , , B. and Barrera، نويسنده , , L. and Botrugno، نويسنده , , A. and Brix، نويسنده , , M. and Figini، نويسنده , , L. and Fonseca، نويسنده , , A. and Giroud، نويسنده , , Giuliano C. and Hawkes، نويسنده , , N. and Howell، نويسنده , , D. and De La Luna، نويسنده , , E. and Orsitto، نويسنده , , F. and Pericoli، نويسنده , , V. and Rachlew، نويسنده , , E. and ، نويسنده ,
Abstract :
The measurement of the safety factor q in tokamaks, which describes the winding of the helical magnetic field lines, is very important especially for the achievement of advanced scenarios. The motional Stark effect diagnostic can provide a direct measurement of the magnetic field orientation but the derivation of the q-profiles requires a simulation of the magnetic equilibrium taking into account inputs from several other diagnostics. This analysis can be affected by large errors. In order to validate the results, q-profiles are compared with the radii of MHD modes, which can be attributed to surfaces of known q.
