Abstract
A limiter made from boron-doped graphite (3.5%, Carbon Lorraine) has been used in TEXTOR as a single main limiter. Additional heating by neutral beam injection (NBI) was applied resulting in heat loads up to 20 MW/m 2 on the limiter, increasing its temperature far beyond 2000 °C. At these high temperatures strong thermal sublimation of boron and carbon from the limiter was measured spectroscopically. After the set of experiments, deposits have been studied on the test limiter and in the SOL on collector probes by interference fringe analysis (IFA), Auger electron spectroscopy (AES), electron microprobe (EPMA) and energy dispersive X-ray analysis (EDX). IFA was applied to estimate the total thickness of the deposits. A very thick boron rich layer (6 μm) had grown near the tangency point of the limiter. Comparing the evaporated and deposited amount of the limiter material a high local deposition of boron and carbon of at least about 69–70% is deduced.
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