A COMPLEX PROBE FOR MEASUREMENTS OF TURBULENCE IN THE EDGE OF MAGNETICALLY CONFINED PLASMAS

To improve the turbulence characterization and the estimation of the t ransport processes at the plasma edge, we designed and installed, in t he Brazilian tokamak (TBR), a complex probe that consisted of five sin gle Langmuir probes, a four-channel triple probe, and magnetic probes. In this work, we describe in detail this diagnostic system and presen t experimental examples of simultaneously measured plasma parameters a nd electrostatic and magnetic turbulent fluctuations in the TBR tokama k. This procedure permits to investigate any coupling between these tw o kinds of oscillations. Furthermore, our results confirmed that corre ctions due to electron temperature fluctuations are relevant for turbu lence characterization. (C) 1997 American Institute of Physics.