The edge of the RFX-mod (R = 2 m, a = 0.46 m) Reversed Field Pinch device is characterized by weak magnetic chaos affecting ion and electron diffusion. Edge particle transport is strongly influenced by a toroidal and poloidal asymmetry caused by magnetic islands and an ambipolar radial electric field ensures local neutrality. At higher plasma current (Iϕ>1MA) a spontaneous resonant dominant mode m/n = 1/7, slowly rotating, develops in the inner region. The edge electron pressure Peand floating potential Vfshow a shape of the Plasma Wall Interaction (PWI) with the same toroidal periodicity, which follows the edge local ideal magnetic displacement Δ1,7. Detailed measurements along the poloidal direction of Peand Vfhave been undertaken newly, their time behavior present respect to Δ1,7a time lag, which depends on the poloidal angle θ. The mode analysis in terms of helical angle reveals a role of the 0/7 mode in determining a poloidal phase lag respect to Δ1,7of Peand Vf. Since the 0/7 is the largest toroidal sideband of the 1/7 mode, this work suggests a role of toroidal coupling in determining the plasma response to a MP.
All Science Journal Classification (ASJC) codes
- Nuclear and High Energy Physics
- Materials Science (miscellaneous)
- Nuclear Energy and Engineering
Scarin, P., Agostini, M., Carraro, L., Spizzo, G., Spolaore, M., & Vianello, N. (2017). Boundary plasma response in RFX-mod to 3D magnetic field perturbations. Nuclear Materials and Energy, 12, 913 - 917. https://doi.org/10.1016/j.nme.2017.03.006