NTM threshold island width measurements on Globus-M based on the Fitzpatrick heat transport model

Abstract

Abstract We estimate the neoclassical tearing mode (NTM) threshold island width, Wc , associated with the bootstrap current contribution to the time evolution of the magnetic island. Following the original work by Fitzpatrick, we solve the heat transport equation for the electron temperature distribution with Wc being the input parameter. The obtained model temperature profile is then fitted to the Globus-M Thomson scattering (TS) data to deduce the actual Wc value. Due to the relatively low resolution of the Globus-M TS in the island region, we have also adopted ASTRA to provide the benchmarking.