Phaedrus-T tokamak probe measurements

摘要

Summary form only given. Measurements of the Phaedrus-T edge plasma parameters have been made with triple probe, swept Langmuir probes, swept emissive probes, self-emissive probes, reciprocating probes, capacitive probes, and shadowed probes of various sizes and materials. ICRF current drive studies are the focus of the Phaedrus-T program; and, consequently, most Phaedrus-T probe measurements have been of ICRF/edge plasma interactions. Data have been obtained that show strong ICRF modifications of edge plasmas when an antenna with a conventional, stainless steel Faraday shield was used; greatly reduced ICRF/edge coupling when boron nitride side limiters were placed on the Faraday shield; and no significant change in the ICRF/edge coupling when the Faraday shield was later removed (even though there was a significant reduction in plasma impurities).