Abstract
The effects of boronization on impurities, using a boron-trimethyl gas combined with helium glow discharge, are investigated in a reversed field pinch (RFP) device. After boronization, total pressure and partial ones of hydrogen and water decrease with the smaller pressure rise of hydrocarbons. From the surface analysis, we find the production of boron/carbon mixed layers (-- 40, nm thick) with metal impurities. With this conditioning, we can suppress the large increase in the plasma density. The ohmic and radiated powers in addition to impurity line intensities (especially near the plasma edge) decrease. Radial profile of soft X-ray intensity, which is higher than that before conditioning, shows somewhat broadening. The main discharges using this gas as a simple conditioning can cause the similar effects on plasma behavior.
