First wall Electrostatic probes for RFX-mod2

RFX-mod2 first wall will be equipped with poloidal and toroidal arrays of electrostatic probes, measuring plasma density and temperature, plasma potential, particle and energy fluxes and floating potential fluctuations. Two toroidal arrays of 71 probes each (one on the high field side and one on the low field side), along with four poloidal arrays (2 of 28 elements and 2 of 17 elements) are foreseen. Such a large amount of sensors is due to the requirement of a better characterization of the numerous instabilities observed in the RFP plasma edge, along with the possibility to study the plasma shape in different tokamak configurations (circular, single null, double null). The aim to maximize information in both the magnetic configurations has led the electrostatic probes design and layout. Three different kinds of probe configurations will be installed: single probes, 5-pin balanced triple probes and ball-pen probes. The conceptual design of the probes takes inspiration from the model successfully installed on RFX-mod, which allows the removal of tiles in case of damage, by means of a remote handling manipulator.