Tritium depth profiling in carbon samples from fusion experiments

Tritium depth profiling by accelerator mass spectrometry has been performed at the Rossendorf 3 MV Tandetron. Tritium particles are counted after the accelerator using a semiconductor detector, while deuterium and other light elements are simultaneously measured with the Faraday cup between the inje ction magnet and the accelerator. Depth profiles have been measured in carb on samples cut from the first wall tiles of the Garching fusion experiment ASDEX-Upgrade and of the European fusion experiment JET, Culham/UK. Tritium contents in the JET samples were up to six orders higher than in samples f rom ASDEX-Upgrade. Tritium beam currents from samples with high tritium con tent were measured partly in the Faraday cup before the accelerator. A dedi cated tritium AMS facility with an air-insulated 100 kV tandem accelerator is under construction. (C) 2000 Elsevier Science B.V. All rights reserved.