Surface-probe analysis of a movable limiter of in hl-1 tokamak

Silicon collector probes and Inconel (GH39,0.3mm) and Aluminium (LFM 0.5mm) probes were attached onto the suriace of a movable limiter in the HL-1 tokamak.After the exposure of 105 TDC and 400 high power discharges,examination oi the limiter surface and SIMS analyses of the collector probes were carried out.An average density of 1011cm-3 for the plasma scrape-off layer is estimated.