A LANGMUIR MACH PROBE ARRAY FOR EDGE PLASMA TURBULENCE AND FLOW/

We have installed and operated a reciprocating Langmuir/Mach probe to simultaneously measure parallel and perpendicular plasma flow profiles along with density, temperature, floating potential profiles, and flu ctuating parameters such as fluctuation driven particle flux and wave number on a single shot. Plasma facing components are made from boron nitride and the probe tips are 1-mm-diam carbon cylinders. The Mach pr obe, designed following the Gundestrup model, has 12 probes arranged i n a circular array. Four Langmuir probes mounted at the front of the M ach probe array measure floating potential, ion saturation current, an d temperature. The perpendicular flow velocity measurements reduced fr om the Mach probe array compare well with the phase velocity measured from the proud Langmuir probes and the E(r) x B poloidal rotation. (C) 1997 American Institute of Physics.