Tritium detection by AMS

Tritium and deuterium depth profiling measurements in carbon samples have been performed at the Rossendorf AMS facilities during the past seven years. The samples have been cut from tiles of the inner walls of the fusion reactors ASDEX-upgrade/Garching, JET/Culham and TFTR/Princeton. The samples from the European fusion experiment JET, which had been operated part time with a D,T plasma showed tritium contents up to six orders higher compared to the samples from ASDEX-upgrade. This required a dedicated AMS facility to prevent any contamination of the versatile 3 MV Tandetron. It is based on an SF6-insulated 100 kV tandem accelerator equipped with a diamond-like carbon (DLC) stripper foil of about 1 μg/cm2. Depth profiles of deuterium and other light elements can be measured simultaneously using a Faraday cup at the entrance of the accelerator (SIMS-mode of the facility) or in case of very low concentrations after acceleration using a Si-detector (AMS-mode). (authors)