Measurement of Electron Thermal Transport Induced by ETG Modes in the Transition from the Slab to the Toroidal Branch of Mode

Transition from the slab to the toroidal branch of the electron temperature gradient (ETG) mode has been successfully achieved in a basic experiment in Columbia Linear Machine CLM [1]. The measurement of the radial electron thermal conductivity shows its increase with transition from slab to the toroidal ETG mode. A miniature triple probe was used for these measurements [2] and the value of thermal $\chi_{\bot e}$ conductivity is found to be about $2-12$ m$^2$/s. The corresponding gyrobohm diffusion coefficient $ \chi_{\bot e,GB}\sim 2-4$ m$^2$/s. A similar result of the transport measurement was obtained by using a novel diagnostic system. \\[4pt] [1] A. Balbaky, V. Sokolov and A.K. Sen, Bulletin of 55th APS DPP, PP8.98, 2013.\\[0pt] [2] V.Sokolov and A.K.Sen, Phys.Rev.Lett.,107, 155001 (2011).