Title of article :
Particle, heat, and sheath power transmission factor profiles during ELM suppression experiments on DIII-D
Author/Authors :
Watkins، نويسنده , , J.G. and Evans، نويسنده , , T.E. and Jakubowski، نويسنده , , M. and Moyer، نويسنده , , R.A. and Schmitz، نويسنده , , O. and Wingen، نويسنده , , A. and Fenstermacher، نويسنده , , M.E. and Joseph، نويسنده , , I. and Lasnier، نويسنده , , C.J. and Rudakov، نويسنده , , D.L.، نويسنده ,
Abstract :
Edge localized modes (ELMs) are predicted to be a significant problem for ITER due to impulse heating of the divertor target plates. During low collisionality experiments on DIII-D where ELMs were suppressed using resonant magnetic perturbations (RMP), target plate profiles of particle flux (Jsat), electron temperature (Te), and floating potential (Vf) have been measured with Langmuir probes (LP) and compared to IRTV heat flux profiles. During ELM suppression, Jsat and Te increase and the Jsat profile broadens. A three-peak structure, most visible in the Vf, agrees with the spacing and q95 dependence of an n = 3 toroidal pattern predicted by the TRIP3D code. The heat flux calculated from Langmuir probe data (using sheath theory) is observed to get ∼2× larger during ELM suppression than between ELMs before the RMP is turned on. The sheath power transmission factor profile has been determined from IRTV and Langmuir probe data.
