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A new Langmuir probe has been designed and installed in TST-2 for measurements of Scrape-Off Layer plasmas (SOL). Non-inductive current drive is considered essential for spherical tokamak reactors. It has previously been shown that a large amount of injected Lower Hybrid Wave (LHW) power is lost in the SOL [1]. A full density profile of SOL conditions is necessary to accurately simulate the propagation of LHW in TST-2. A new probe was designed for durability, larger signal and Mach probe measurements. The new probe has been installed in TST-2 and results have been obtained. Temperature measurements show Te = 30 50 eV during RF injection and < 10 eV otherwise. Density measurements show ne = 2.0× 1015 m−3 and 1.5× 1016 m−3 during flat-top RF power injection from Outboardand Top-launch antennas, respectively. This is above the cut-off density for the 200 MHz LHW (5× 1014 m−3) in TST-2, thus LHW can propagate through SOL plasma.

Langmuir Probe Measurements of Scrape-Off Layer Conditions in RF-Driven Plasmas in TST-2