INVESTIGATION OF THE DEUTERIUM DISTRIBUTION IN A JET LIMITER USING THE NUCLEAR MICROPROBE AND ION-BEAM SLOPE CUTTING

For studying deuterium depth profiles in surfaces of JET (Joint European Torus) limiters, a new deuterium profiling method was developed and used. A smooth 10-degrees slope plane on the specimen was produced by ion beam slope cutting using a 10 keV Kr ion beam. To detect deuterium the nuclear reaction H-2(C-12, p)C-13 was used at E(C-12(3+) = 7.5 MeV. The very narrow proton peak could be clearly separated from the background of the spectra. For measuring the lateral and vertical deuterium distribution the C-12 beam of the Rossendorf 5 MV tandem accelerator was focussed to about 6-mu-m and scanned across the specimen. The preliminary results show a deuterium distribution up to a depth of about 5-mu-m in a carbon limiter.